Prep for 0.3.12 release

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@809 42af7a65-404d-4744-a932-0658087f49c3
Fixes for Z16F compiler
2025-12-17 02:06:54 +08:00 · 2008-08-10 17:44:27 +00:00 · 2008-08-10 16:57:15 +00:00 · 2008-08-10 16:36:33 +00:00 · 2008-08-10 14:50:27 +00:00 · 2008-08-09 21:48:06 +00:00
181 changed files with 16826 additions and 1579 deletions
--- a/44
+++ b/44
@@ -0,0 +1,44 @@
+/*************************************************************************
+ *                                                                       *
+ * COPYING -- Describes the terms under which Nuttx is distributed. A    *
+ * copy of the BSD-style licensing is included in this file. In my       *
+ * words -- I believe that you should free to use NuttX in any           *
+ * environmnet, private, private, commercial, open, closed, etc.         *
+ * provided only that you repect the modest copyright notices as         *
+ * described in license (below).  Please feel free to contact me if you  *
+ * have any licensing concerns.                                          *
+ *                                                                       *
+ *************************************************************************
+ *                                                                       *
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.         *
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>                       *
+ *                                                                       *
+ * Redistribution and use in source and binary forms, with or without    *
+ * modification, are permitted provided that the following conditions    *
+ * are met:                                                              *
+ *                                                                       *
+ * 1. Redistributions of source code must retain the above copyright     *
+ *    notice, this list of conditions and the following disclaimer.      *
+ * 2. Redistributions in binary form must reproduce the above copyright  *
+ *    notice, this list of conditions and the following disclaimer in    *
+ *    the documentation and/or other materials provided with the         *
+ *    distribution.                                                      *
+ * 3. Neither the name NuttX nor the names of its contributors may be    *
+ *    used to endorse or promote products derived from this software     *
+ *    without specific prior written permission.                         *
+ *                                                                       *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS   *
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT     *
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS     *
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE        *
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,   *
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,  *
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS *
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED    *
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT           *
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN     *
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE       *
+ * POSSIBILITY OF SUCH DAMAGE.                                           *
+ *                                                                       *
+ *************************************************************************/
+
--- a/45
+++ b/45
@@ -347,6 +347,49 @@
 	  Ubuntu where /bin/sh is a link to dash.
 	* Z8Encore! port verified on ZDS-II instruction set/chip simulator.

-0.3.10 2008-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
+0.3.10 2008-05-15 Gregory Nutt <spudmonkey@racsa.co.cr>

+	* Add support for the ZiLOG EZ80Acclaim microcontrooler (EZ80F91 chip).
+	* Add configuration for the ZiLOG z8f64200100kit development kit, Z8F6423 part.
+	* Add configuration for the ZiLOG ez80f0910200kitg development kit, EZ80F091 part.
+	* Correct critical list handling errors in task shutdown logic: One in timer
+	  deletion logic (timer_delete.c) and one in stream logic (lib_init.c) reported
+	  by kwonsk.

+0.3.11 2008-06-01 Gregory Nutt <spudmonkey@racsa.co.cr>
+
+	* Add support for recursive mutexes.
+	* Eliminate a memory leak -- contained watchdog instance was not being
+	  deleted with a POSIX timer was deleted reported by kwonsk.
+	* Eliminate a deadlock condition in opendir() reported by kwonsk.
+	* Fix several FAT filesystem problems reported by kwonsk (Changes not yet
+	  verified).
+	* Host simulator no longer uses Linux system calls directly; Now works with Cygwin.
+	* Fix an error that occurs when a POSIX timer is deleted by the timer signal handler.
+	* Add logic to allow the examples/ostest to be run repetitively as an endurance test.
+	* Add a ramdisk block driver
+
+0.3.12 2008-08-10 Gregory Nutt <spudmonkey@racsa.co.cr>
+
+	* Improved solution to POSIX timer lifetime controls bug fixed in 0.3.11.
+	* Add test for recursive mutexes
+	* Correct bug in recursive mutex logic
+	* Add mkfifo()
+	* Add pipe() and test for both pipes and fifos
+	* Attempts to open a FIFO will now block until there is at least one writer
+	* Add test/Fixed errors in FIFO reader/writer interlocks
+	* Removed limitation: task_create() was only dup'ing 3 file descriptors (now
+	  dups all open file descriptors).
+	* Added a test for redirection of stdio through pipes
+	* Fixed error in dup and dup2: Must call open/close methods in fs/driver so that
+	  driver can correctly maintain open reference counts.
+	* Same issue on closing file descriptors in exit()
+	* Fixed in error in stdio flush logic.  Needed ssize_t vs size_t for error
+	  check.
+	* Moved all FAT related files from fs to fs/fat
+	* Implemented mkfatfs(), a non-standard API to create a FAT filesystem on a
+	  block device (not yet tested).
+	* Added a test for mkfatfs() on a RAM disk in examples/mount and verified
+	  basic mkfatfs functionality for FAT12.
+
+0.3.13 2008-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
--- a/Documentation/NuttX.html
+++ b/Documentation/NuttX.html
@@ -8,7 +8,7 @@
  <tr align="center" bgcolor="#e4e4e4">
    <td>
      <h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
-      <p>Last Updated: March 9, 2008</p>
+      <p>Last Updated: August 10, 2008</p>
    </td>
  </tr>
 </table>
@@ -456,21 +456,31 @@
 </table>

 <p>
-  The 21st release of NuttX (nuttx-0.3.9) is available for download
+  The 24th release of NuttX (nuttx-0.3.12) is available for download
  from the <a href="http://sourceforge.net/project/showfiles.php?group_id=189573">SourceForge</a>
  website.
  The change log associated with the release is available <a href="#currentrelease">here</a>.
  Unreleased changes after this release are available in CVS.
  These unreleased changes are listed <a href="#pendingchanges">here</a>.
 </p>
-<p>
-  nuttx-0.3.8 is a minor feature enhancement release.
-  This release includes support for the ZiLOG Z8Encore! microcontroller.
-  Also included is the initial framework for support for the Z80,
-  <a href="http://www.tim-mann.org/xtrs.html">XTRS</a> platform.
+  The nuttx-0.3.12 release includes some minor bugfixes as well as a few new features.
+  Bugs fixed include:
+  <ul>
+    <li>Corrected an error in recursive mutex implementation.</li>
+    <li>task_create() was only dup'in the first three file descriptors.</li>
+    <li>Fixed driver open reference counting errors in dup(), dup2(), and exit().</li>
+    <li>Fixed error handling logic in fflush().</li>
+  </ul>
+</p>
+<p>
+  New features were also added:
+  <ul>
+    <li>Pipes and pipe() API</li>
+    <li>FIFOs and mkfifo() API</li>
+    <li>mkfatfs() API can be used to format FAT file systems.</li>
+  </ul>
 </p>
 <p>
-  This released has been verified only on the ZiLOG ZDS-II Z8Encore! chip simulation.
  As usual, any feedback about bugs or suggestions for improvement would be greatly appreciated.
 </p>

@@ -605,6 +615,27 @@
    </p>
   </td>
 </tr>
+<tr>
+  <td valign="top"><img src="favicon.ico"></td>
+  <td bgcolor="#5eaee1">
+    <b>Zilog eZ80Acclaim!</b>
+  </td>
+</tr>
+<tr>
+  <td><br></td>
+  <td>
+    <p>
+      <b>Zilog eZ80Acclaim! Microncontroller</b>.
+      This port uses the ZiLOG ez80f0910200kitg development kit, eZ80F091 part
+      and the Zilog ZDS-II Windows command line tools.
+      The development environment is Cygwin under WinXP.
+    </p>
+    <p>
+      <b>STATUS:</b>
+      This is a work in progress.  Verified ez80 support will be announced in a future NuttX release.
+    </p>
+   </td>
+</tr>
 <tr>
  <td valign="top"><img src="favicon.ico"></td>
  <td bgcolor="#5eaee1">
@@ -616,13 +647,20 @@
  <td>
    <p>
      <b>Zilog Z8Encore! Microncontroller</b>.
-      This port use the Zilog z8encore000zco development kit, Z8F6403 part, and the Zilog
-      ZDS-II Windows command line tools.
+      This port uses the either:
+    </p>
+    <ul>
+      <li>Zilog z8encore000zco development kit, Z8F6403 part, or</li>
+      <li>Zilog z8f64200100kit development kit, Z8F6423 part</li>
+    </ul>
+    <p>
+      and the Zilog ZDS-II Windows command line tools.
      The development environment is Cygwin under WinXP.
    </p>
    <p>
      <b>STATUS:</b>
-      This released has been verified only on the ZiLOG ZDS-II Z8Encore! chip simulation.
+      This release has been verified only on the ZiLOG ZDS-II Z8Encore! chip simulation
+      as of nuttx-0.3.9.
    </p>
   </td>
 </tr>
@@ -941,18 +979,28 @@ Other memory:
 </table>

 <pre><ul>
-nuttx-0.3.9 2008-03-09 Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;
+0.3.12 2008-08-10 Gregory Nutt <spudmonkey@racsa.co.cr>

-	* Began adding support for the ZiLOG Z8Encore! microcontroller for the Z8Encore000ZCO
-	  development board and the Z8F6403 part.
-	* Fix broken 'clean' target on z80sim configurations
-	* Re-structure arch/z80 to provide support for all ZiLOG 8-bit microcontrollers (ez8
-	  in particular for now).
-	* Add support for TRS80-Model 3 based on the xtrs emulation (http://www.tim-mann.org/xtrs.html)
-	  Per patch from Jacques Pelletier.
-	* In all shell scripts, change #!/bin/sh to #!/bin/bash to resolve problems in
-	  Ubuntu where /bin/sh is a link to dash.
-	* Z8Encore! port verified on ZDS-II instruction set/chip simulator.
+	* Improved solution to POSIX timer lifetime controls bug fixed in 0.3.11.
+	* Add test for recursive mutexes
+	* Correct bug in recursive mutex logic
+	* Add mkfifo()
+	* Add pipe() and test for both pipes and fifos
+	* Attempts to open a FIFO will now block until there is at least one writer
+	* Add test/Fixed errors in FIFO reader/writer interlocks
+	* Removed limitation: task_create() was only dup'ing 3 file descriptors (now
+	  dups all open file descriptors).
+	* Added a test for redirection of stdio through pipes
+	* Fixed error in dup and dup2: Must call open/close methods in fs/driver so that
+	  driver can correctly maintain open reference counts.
+	* Same issue on closing file descriptors in exit()
+	* Fixed in error in stdio flush logic.  Needed ssize_t vs size_t for error
+	  check.
+	* Moved all FAT related files from fs to fs/fat
+	* Implemented mkfatfs(), a non-standard API to create a FAT filesystem on a
+	  block device (not yet tested).
+	* Added a test for mkfatfs() on a RAM disk in examples/mount and verified
+	  basic mkfatfs functionality for FAT12.

 pascal-0.1.2 2008-02-10 Gregory Nutt <spudmonkey@racsa.co.cr>

@@ -978,13 +1026,13 @@ buildroot-0.1.0 2007-03-09 &lt;spudmonkey@racsa.co.cr&gt
 </table>

 <pre><ul>
-nuttx-0.3.10 2008-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;
+nuttx-0.3.13 2008-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;

 pascal-0.1.3 2008-xx-xx Gregory Nutt &lt;spudmonkey@racsa.co.cr&gt;

-buildroot-0.1.1 2007-xx-xx &lt;spudmonkey@racsa.co.cr&gt
+buildroot-0.1.1 2008-xx-xx &lt;spudmonkey@racsa.co.cr&gt

-	*  Support for m68k-elf and m68hc11 toolchain
+	* Support for m68k-elf and m68hc11 toolchain
 </pre></ul>

 <table width ="100%">
--- a/Documentation/NuttxPortingGuide.html
+++ b/Documentation/NuttxPortingGuide.html
@@ -16,7 +16,7 @@
  </b></big></h1>
  <p><small>by</small></p>
  <p>Gregory Nutt</p>
-  <p><small>Last Update: February 15, 2008</small></p>
+  <p><small>Last Update: July 21, 2008</small></p>
 </center>

 <center><h1>Table of Contents</h1></center>
@@ -431,7 +431,7 @@

    <li><code>arch/z80</code>:
    This directory holds 8-bit ZiLOG architectures.  At present, this includes the
-    Zilog z80 and z8Encore! Microcontrollers.
+    Zilog z80, ez80Acclaim! and z8Encore! Microcontrollers.
    <ul>
      <li><code>arch/z80/include</code> and <code>arch/z80/src/common</code>:
          Common logic.
@@ -446,11 +446,18 @@
        (verified with version 2.6.0 and 2.7.0).
      </li>

+      <li><code>arch/z80/include/ez80</code> and <code>arch/z80/src/ez80</code>:
+        The ez80Acclaim! port uses the ZiLOG ez80f0910200kitg development kit, eZ80F091 part,
+        with the Zilog ZDS-II Windows command line tools.
+        The development environment is Cygwin under WinXP.
+        This is a work in progress.  Verified ez80 support will be announced in a future NuttX release.
+      </li>
+
      <li><code>arch/z80/include/z8</code> and <code>arch/z80/src/z8</code>:
-        The Z8Encore! port use the Zilog z8encore000zco
-        development kit, Z8F6403 part, and the Zilog ZDS-II Windows command line
+        The Z8Encore! port uses either the ZiLOG z8encore000zco development kit, Z8F6403 part,
+        or the z8f64200100kit development kit, Z8F6423 part with the Zilog ZDS-II Windows command line
        tools.  The development environment is Cygwin under WinXP.
-        This port is in progress and will be released in a future NuttX release.
+        The initial release, verified only on the ZDS-II ez8 simulator, was released in nuttx-0.3.9.
      </li>
    </ul>
    </li>
@@ -650,12 +657,24 @@
    The development environment is Cygwin under WinXP.
  </li>

+  <li><code>configs/ez80f0910200kitg</code>
+    ez80Acclaim! Microcontroller.  This port use the Zilog ez80f0910200kitg
+    development kit, eZ80F091 part, and the Zilog ZDS-II Windows command line
+    tools.  The development environment is Cygwin under WinXP.
+  </li>
+
  <li><code>configs/z8encore000zco</code>
    z8Encore! Microcontroller.  This port use the Zilog z8encore000zco
    development kit, Z8F6403 part, and the Zilog ZDS-II Windows command line
    tools.  The development environment is Cygwin under WinXP.
  </li>

+  <li><code>configs/z8encore000zco</code>
+    z8Encore! Microcontroller.  This port use the Zilog z8f64200100kit
+    development kit, Z8F6423 part, and the Zilog ZDS-II Windows command line
+    tools.  The development environment is Cygwin under WinXP.
+  </li>
+
  <li><code>configs/z80sim</code>:
    z80 Microcontroller.  This port uses a Z80 instruction set simulator.
    That simulator can be found in the NuttX CVS
@@ -1389,6 +1408,9 @@ The system can be re-made subsequently by just typing <code>make</code>.
    <code>CONFIG_DEV_CONSOLE</code>: Set if architecture-specific logic
    provides /dev/console.  Enables stdout, stderr, stdin.
  </li>
+  <li>
+    <code>CONFIG_MUTEX_TYPES</code>: Set to enabled support for recursive and
+    errorcheck mutexes.  Enables <code>pthread_mutexattr_settype()</code>.
 </ul>

 <p>
@@ -1487,6 +1509,10 @@ The system can be re-made subsequently by just typing <code>make</code>.
    structures.  The system manages a pool of preallocated
    watchdog structures to minimize dynamic allocations
  </li>
+  <li>
+    <code>CONFIG_DEV_PIPE_SIZE</code>: Size, in bytes, of the buffer to allocated
+    for pipe and FIFO support (default is 1024).
+  </li>
 </ul>

 <h2>Network Support</h2>
--- a/Documentation/NuttxUserGuide.html
+++ b/Documentation/NuttxUserGuide.html
--- a/54
+++ b/54
@@ -441,3 +441,57 @@ This released has been verified only on the ZiLOG ZDS-II Z8Encore!
 chip simulation.

 This tarball contains a complete CVS snapshot from March 9, 2008.
+
+nuttx-0.3.10
+^^^^^^^^^^^^
+
+This is the 22nd release of NuttX.  This is an important bug fix release.
+This release incorporates fixes to correct critical list handling errors
+in task shutdown logic: One in timer deletion logic (timer_delete.c) and one
+in stream logic (lib_init.c).  This release also includes support to ZiLOG EZ80Acclaim
+microcontrooler (EZ80F91 chip) and configurations fot the ZiLOG z8f64200100kit (Z8F6423)
+and ez80f0910200kitg (EZ80F091) development kit.
+
+nuttx-0.3.11
+^^^^^^^^^^^^
+
+This is the 23rd release of NuttX.  This is another important bugfix release.
+This releases fixes several bugs:
+
+* Two POSIX timer bugs: a memory leak as well a fatal sequencing error.
+* Several FAT filesystem errors.
+* A deadlock that can occur in opendir()
+
+A few new features were also added:
+
+* Support for recursive mutexes
+* Added a RAM disk block driver
+* The host simulator no longer uses direct Linux system calls and now also works on Cygwin.
+* The OS test was strengthen and now runs as an endurance test
+
+These changes were verified only on the Host simulator under Cygwin.  Please report
+any errors to me.
+
+This tarball contains a complete CVS snapshot from July 1, 2008.
+
+nuttx-0.3.12
+^^^^^^^^^^^^
+
+This is the 24th release of NuttX.  This release includes some minor bugfixes as well
+as a few new features.  Bugs fixed include:
+
+* Corrected an error in recursive mutex implementation.
+* task_create() was only dup'in the first three file descriptors.
+* Fixed driver open reference counting errors in dup(), dup2(), and exit().
+* Fixed error handling logic in fflush().
+
+New features were also added:
+
+* Pipes and pipe() API
+* FIFOs and mkfifo() API
+* mkfatfs() API can be used to format FAT file systems.
+
+These changes were verified only on the Host simulator under Cygwin.  Please report
+any errors to me.
+
+This tarball contains a complete CVS snapshot from August 10, 2008.
--- a/15
+++ b/15
@@ -1,4 +1,4 @@
-NuttX TODO List (Last updated February 13, 2008)
+NuttX TODO List (Last updated July 31, 2008)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  (6)  Task/Scheduler (sched/)
@@ -10,7 +10,7 @@ NuttX TODO List (Last updated February 13, 2008)
  (11) Network (net/, netutils/)
  (2)  USB (drivers/usbdev)
  (3)  Libraries (lib/)
-  (3)  File system/Generic drivers (fs/, drivers/)
+  (5)  File system/Generic drivers (fs/, drivers/)
  (1)  Pascal add-on (pcode/)
  (2)  Documentation (Documentation/)
  (3)  Build system
@@ -221,7 +221,7 @@ o Libraries (lib/)
 o File system / Generic drivers (fs/, drivers/)
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

-  Description: Add chmod(), truncate().
+  Description: Implement chmod(), truncate().
  Status:      Open
  Priority:    Low

@@ -233,6 +233,15 @@ o File system / Generic drivers (fs/, drivers/)
  Status:      Open
  Priority:    Medium

+  Description: There is no way to remove a FIFO or PIPE created in the
+               psuedo filesystem.  Once created, they persist indefinitely
+               and cannot be unlinked.  This is actually a more generic
+               issue:  unlink does not work for anything in the psuedo-
+               filesystem.
+  Status:      Open, but partially resolved: pipe buffer is at least freed
+               when there are not open references to the pipe/FIFO.
+  Priority:    Medium
+
 o Pascal Add-On (pcode/)
  ^^^^^^^^^^^^^^^^^^^^^^

--- a/arch/sim/src/Makefile
+++ b/arch/sim/src/Makefile
@@ -45,24 +45,27 @@ CSRCS		= up_initialize.c up_idle.c up_interruptcontext.c \
 		  up_releasepending.c up_reprioritizertr.c \
 		  up_exit.c up_schedulesigaction.c up_allocateheap.c \
 		  up_devconsole.c
+HOSTSRCS	= up_stdio.c
 ifeq ($(CONFIG_FS_FAT),y)
 CSRCS		+= up_blockdevice.c up_deviceimage.c
 endif
 ifeq ($(CONFIG_NET),y)
 CSRCS		+= up_uipdriver.c
-SPECSRCS	+= up_tapdev.c
+HOSTSRCS	+= up_tapdev.c
 endif

 COBJS		= $(CSRCS:.c=$(OBJEXT))
-SPECOBJS	= $(SPECSRCS:.c=$(OBJEXT))

-SRCS		= $(ASRCS) $(CSRCS) $(SPECSRCS)
-OBJS		= $(AOBJS) $(COBJS) $(SPECOBJS)
+NXOBJS		= $(AOBJS) $(COBJS)
+HOSTOBJS	= $(HOSTSRCS:.c=$(OBJEXT))
+
+SRCS		= $(ASRCS) $(CSRCS) $(HOSTSRCS)
+OBJS		= $(AOBJS) $(COBJS) $(HOSTOBJS)

 LDFLAGS		= $(ARCHSCRIPT)
-STDLIBS	= -lc
+STDLIBS		= -lc
 ifeq ($(CONFIG_FS_FAT),y)
-STDLIBS	+= -lz
+STDLIBS		+= -lz
 endif

 LINKOBJS	= up_head$(OBJEXT)
@@ -78,21 +81,40 @@ $(AOBJS): %$(OBJEXT): %.S
 $(COBJS) $(LINKOBJS): %$(OBJEXT): %.c
 	$(call COMPILE, $<, $@)

-$(SPECOBJS): %$(OBJEXT): %.c
-	$(CC) -c $(HOSTCFLAGS) $< -o $@
+$(HOSTOBJS): %$(OBJEXT): %.c
+	@echo "CC:  $<"
+	@$(CC) -c $(HOSTCFLAGS) $< -o $@

-libarch$(LIBEXT): $(OBJS)
-	@( for obj in $(OBJS) ; do \
+# The architecture-specific library
+libarch$(LIBEXT): $(NXOBJS)
+	@( for obj in $(NXOBJS) ; do \
 		$(call ARCHIVE, $@, $${obj}); \
 	done ; )

-nuttx$(EXEEXT): $(LINKOBJS)
+# A partially linked object containing only NuttX code (no interface to host OS)
+# Change the names of most symbols that conflict with libc symbols.
+
+Linux-names.dat: nuttx-names.dat
+	@cp $^ $@
+
+Cygwin-names.dat: nuttx-names.dat
+	@cat $^ | sed -e "s/^/_/g" >$@
+
+nuttx.rel : libarch$(LIBEXT) $(HOSTOS)-names.dat $(LINKOBJS)
+	@echo "LD:  nuttx.rel"
+	@$(LD) -r $(LDFLAGS) $(LDPATHES) -o $@ $(LINKOBJS) --start-group $(LDLIBS) --end-group $(EXTRA_LIBS)
+	@$(OBJCOPY) --redefine-syms=$(HOSTOS)-names.dat $@
+
+# Generate the final NuttX binary by linking the host-specific objects with the NuttX
+# specific objects (with munged names)
+
+nuttx$(EXEEXT): nuttx.rel $(HOSTOBJS)
 	@echo "LD:  nuttx$(EXEEXT)"
-	@$(CC) $(LDFLAGS) $(LDPATHES) -o $(TOPDIR)/$@ $(LINKOBJS) \
-		-Wl,--start-group $(LDLIBS) -Wl,--end-group $(STDLIBS) $(EXTRA_LIBS)
+	@$(CC) $(LDFLAGS) $(LDPATHES) -o $(TOPDIR)/$@ nuttx.rel $(HOSTOBJS) $(STDLIBS)
 	@$(NM) $(TOPDIR)/$@ | \
 		grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | \
 		sort > $(TOPDIR)/System.map
+	@rm -f nuttx.rel

 .depend: Makefile $(SRCS)
 	@$(MKDEP) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
@@ -101,7 +123,8 @@ nuttx$(EXEEXT): $(LINKOBJS)
 depend: .depend

 clean:
-	@rm -f libarch$(LIBEXT) *~ .*.swp
+	@rm -f nuttx.rel libarch$(LIBEXT) *~ .*.swp
+	@rm -f nuttx.rel Linux-names.dat Cygwin-names.dat
 	$(call CLEAN)

 distclean: clean
--- a/arch/sim/src/nuttx-names.dat
+++ b/arch/sim/src/nuttx-names.dat
@@ -0,0 +1,34 @@
+calloc       NXcalloc
+close        NXclose
+closedir     NXclosedir
+dup          NXdup
+free         NXfree
+fclose       NXfclose
+fopen        NXfopen
+fputc        NXfputc
+fread        NXfread
+fwrite       NXfwrite
+fsync        NXfsync
+gettimeofday NXgettimeofday
+ioctl        NXioctl
+lseek        NXlseek
+malloc       NXmalloc
+malloc_init  NXmalloc_init
+mkdir        NXmkdir
+mount        NXmount
+open         NXopen
+opendir      NXopendir
+read         NXread
+realloc      NXrealloc
+rewinddir    NXrewinddir
+rmdir        NXrmdir
+seekdir      NXseekdir
+select       NXselect
+socket       NXsocket
+stat         NXstat
+statfs       NXstatfs
+system       NXsystem
+umount       NXumount
+unlink       NXunlink
+write        NXwrite
+zmalloc      NXzmalloc
--- a/arch/sim/src/up_allocateheap.c
+++ b/arch/sim/src/up_allocateheap.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_allocateheap.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -45,25 +45,25 @@
 #include "os_internal.h"
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

 static ubyte sim_heap[SIM_HEAP_SIZE];

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_allocate_heap
 *
 * Description:
@@ -72,7 +72,7 @@ static ubyte sim_heap[SIM_HEAP_SIZE];
 *   are not defined, then this function will be called to
 *   dynamically set aside the heap region.
 *
- ************************************************************/
+ ****************************************************************************/

 void up_allocate_heap(void **heap_start, size_t *heap_size)
 {
--- a/arch/sim/src/up_blockdevice.c
+++ b/arch/sim/src/up_blockdevice.c
@@ -1,7 +1,7 @@
 /****************************************************************************
 * up_blockdevice.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -38,11 +38,13 @@
 ****************************************************************************/

 #include <nuttx/config.h>
+
 #include <sys/types.h>
 #include <string.h>
-#include <nuttx/fs.h>
 #include <errno.h>

+#include <nuttx/ramdisk.h>
+
 #include "up_internal.h"

 /****************************************************************************
@@ -60,128 +62,14 @@
 * Private Function Prototypes
 ****************************************************************************/

-static int     up_open(FAR struct inode *inode);
-static int     up_close(FAR struct inode *inode);
-static ssize_t up_read(FAR struct inode *inode, unsigned char *buffer,
-                       size_t start_sector, unsigned int nsectors);
-static ssize_t up_write(FAR struct inode *inode, const unsigned char *buffer,
-                        size_t start_sector, unsigned int nsectors);
-static int     up_geometry(FAR struct inode *inode, struct geometry *geometry);
-
 /****************************************************************************
 * Private Data
 ****************************************************************************/

-static const struct block_operations g_bops =
-{
-  .open     = up_open,
-  .close    = up_close,
-  .read     = up_read,
-  .write    = up_write,
-  .geometry = up_geometry,
-};
-
 /****************************************************************************
 * Private Functions
 ****************************************************************************/

-/****************************************************************************
- * Name: up_open
- *
- * Description: Open the block device
- *
- ****************************************************************************/
-
-static int up_open(FAR struct inode *inode)
-{
-  return OK;
-}
-
-/****************************************************************************
- * Name: up_closel
- *
- * Description: close the block device
- *
- ****************************************************************************/
-
-static int up_close(FAR struct inode *inode)
-{
-  return OK;
-}
-
-/****************************************************************************
- * Name: up_read
- *
- * Description:  Read the specified numer of sectors
- *
- ****************************************************************************/
-
-static ssize_t up_read(FAR struct inode *inode, unsigned char *buffer,
-                       size_t start_sector, unsigned int nsectors)
-{
-  if (inode)
-    {
-      char *src = inode->i_private;
-      if (src &&
-          start_sector < NSECTORS &&
-          start_sector + nsectors < NSECTORS)
-        {
-          memcpy(buffer,
-                 &src[start_sector*LOGICAL_SECTOR_SIZE],
-                 nsectors*LOGICAL_SECTOR_SIZE);
-          return nsectors;
-        }
-    }
-  return -EINVAL;
-}
-
-/****************************************************************************
- * Name: up_write
- *
- * Description: Write the specified number of sectors
- *
- ****************************************************************************/
-
-static ssize_t up_write(FAR struct inode *inode, const unsigned char *buffer,
-                        size_t start_sector, unsigned int nsectors)
-{
-  if (inode)
-    {
-      char *dest = inode->i_private;
-      if (dest &&
-          start_sector < NSECTORS &&
-          start_sector + nsectors < NSECTORS)
-        {
-          memcpy(&dest[start_sector*LOGICAL_SECTOR_SIZE],
-                 buffer,
-                 nsectors*LOGICAL_SECTOR_SIZE);
-          return nsectors;
-        }
-    }
-  return -EINVAL;
-}
-
-/****************************************************************************
- * Name: up_geometry
- *
- * Description: Return device geometry
- *
- ****************************************************************************/
-
-static int up_geometry(FAR struct inode *inode, struct geometry *geometry)
- {
-   if (geometry)
-     {
-       geometry->geo_available     = (inode->i_private != NULL);
-       geometry->geo_mediachanged  = FALSE;
-       geometry->geo_writeenabled  = TRUE;
-       geometry->geo_nsectors      = NSECTORS;
-       geometry->geo_sectorsize    = LOGICAL_SECTOR_SIZE;
-       return OK;
-     }
-   return -EINVAL;
- }
-
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
@@ -189,13 +77,11 @@ static int up_geometry(FAR struct inode *inode, struct geometry *geometry)
 /****************************************************************************
 * Name: up_registerblockdevice
 *
- * Description: Register the simulated block device
-
+ * Description: Register the FAT ramdisk
+ *
 ****************************************************************************/

 void up_registerblockdevice(void)
 {
-  /* Inode private data is a filesystem image */
-  void *priv = (void*)up_deviceimage();
-  (void)register_blockdriver("/dev/blkdev", &g_bops, 0, priv);
+  rd_register(0, up_deviceimage(), NSECTORS, LOGICAL_SECTOR_SIZE, TRUE);
 }
--- a/arch/sim/src/up_blocktask.c
+++ b/arch/sim/src/up_blocktask.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_blocktask.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -45,23 +45,23 @@
 #include "os_internal.h"
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_block_task
 *
 * Description:
@@ -79,7 +79,7 @@
 *   task_state: Specifies which waiting task list should be
 *     hold the blocked task TCB.
 *
- ************************************************************/
+ ****************************************************************************/

 void up_block_task(_TCB *tcb, tstate_t task_state)
 {
--- a/arch/sim/src/up_createstack.c
+++ b/arch/sim/src/up_createstack.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_createstack.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -43,23 +43,23 @@
 #include <nuttx/kmalloc.h>
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_create_stack
 *
 * Description:
@@ -79,7 +79,7 @@
 *   stack_size: The requested stack size.  At least this much
 *     must be allocated.
 *
- ************************************************************/
+ ****************************************************************************/

 STATUS up_create_stack(_TCB *tcb, size_t stack_size)
 {
--- a/arch/sim/src/up_devconsole.c
+++ b/arch/sim/src/up_devconsole.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_devconsole.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,43 +31,32 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-#if !defined(linux) && !defined(__CYGWIN__)
-# error "Sorry, this will only work with Linux"
-#else
-
-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
-
-#include <stdio.h>
-#include <errno.h>
-
 #include <nuttx/fs.h>

 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Definitions
- ************************************************************/
+ ****************************************************************************/

-#define READ   3
-#define WRITE  4
-
-/************************************************************
+/****************************************************************************
 * Private Function Prototypes
- ************************************************************/
+ ****************************************************************************/

 static ssize_t devconsole_read(struct file *, char *, size_t);
 static ssize_t devconsole_write(struct file *, const char *, size_t);

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

 static struct file_operations devconsole_fops =
 {
@@ -75,69 +64,26 @@ static struct file_operations devconsole_fops =
  .write	= devconsole_write,
 };

-/************************************************************
+/****************************************************************************
 * Private Functions
- ************************************************************/
+ ****************************************************************************/

-static inline int up_read(int fd, void* buf, size_t count)
+
+ static ssize_t devconsole_read(struct file *filp, char *buffer, size_t len)
 {
-  uint32 result;
-
-  __asm__ volatile ("int $0x80" \
-                    : "=a" (result) \
-                    : "0" (READ), "b" ((uint32)(fd)), "c" ((uint32)(buf)), "d" ((uint32)(count)) \
-                    : "memory");
-
-  return (int)result;
-}
-
-static inline int up_write(int fd, const void* buf, size_t count)
-{
-  uint32 result;
-
-  __asm__ volatile ("int $0x80" \
-                    : "=a" (result) \
-                    : "0" (WRITE), "b" ((uint32)(fd)), "c" ((uint32)(buf)), "d" ((uint32)(count)) \
-                    : "memory");
-
-  return (int)result;
-}
-
-static inline int up_check_result(int result)
-{
-  if (result >= (uint32)(-(128 + 1)))
-    {
-      *get_errno_ptr() = -result;
-      result = ERROR;
-    }
-  return result;
-}
-
-static ssize_t devconsole_read(struct file *filp, char *buffer, size_t len)
-{
-  return up_check_result(up_read(1, buffer, len));
+  return up_hostread(buffer, len);
 }

 static ssize_t devconsole_write(struct file *filp, const char *buffer, size_t len)
 {
-  return up_check_result(up_write(1, buffer, len));
+  return up_hostwrite(buffer, len);
 }

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

 void up_devconsole(void)
 {
  (void)register_driver("/dev/console", &devconsole_fops, 0666, NULL);
 }
-
-int up_putc(int ch)
-{
-  char b = ch;
-  (void)up_write(1, &b, 1);
-  return ch;
-}
-
-#endif /* linux */
-
--- a/arch/sim/src/up_head.c
+++ b/arch/sim/src/up_head.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_head.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <sys/types.h>
 #include <stdio.h>
@@ -45,15 +45,15 @@
 #include <nuttx/init.h>
 #include <nuttx/arch.h>

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

 static jmp_buf sim_abort;

-/************************************************************
- * Global Funtions
- ************************************************************/
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/

 int main(int argc, char **argv, char **envp)
 {
--- a/arch/sim/src/up_idle.c
+++ b/arch/sim/src/up_idle.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_idle.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -31,34 +31,34 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
 #include <nuttx/arch.h>
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_idle
 *
 * Description:
@@ -71,7 +71,7 @@
 *   this is where power management operations might be
 *   performed.
 *
- ************************************************************/
+ ****************************************************************************/

 void up_idle(void)
 {
--- a/arch/sim/src/up_initialize.c
+++ b/arch/sim/src/up_initialize.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_initialize.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -43,23 +43,23 @@
 #include <nuttx/fs.h>
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_initialize
 *
 * Description:
@@ -77,7 +77,7 @@
 *   libraries have been initialized.  OS services and driver
 *   services are available.
 *
- ************************************************************/
+ ****************************************************************************/

 void up_initialize(void)
 {
@@ -85,7 +85,7 @@ void up_initialize(void)

  devnull_register();       /* Standard /dev/null */
  up_devconsole();          /* Our private /dev/console */
-  up_registerblockdevice(); /* Our simulated block device /dev/blkdev */
+  up_registerblockdevice(); /* Our FAT ramdisk at /dev/ram0 */
 #if defined(CONFIG_NET) && defined(linux)
  uipdriver_init();         /* Our "real" netwok driver */
 #endif
--- a/arch/sim/src/up_initialstate.c
+++ b/arch/sim/src/up_initialstate.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_initialstate.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -43,23 +43,23 @@
 #include <nuttx/arch.h>
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_initial_state
 *
 * Description:
@@ -71,7 +71,7 @@
 *   and/or  stack so that execution will begin at tcb->start
 *   on the next context switch.
 *
- ************************************************************/
+ ****************************************************************************/

 void up_initial_state(_TCB *tcb)
 {
--- a/arch/sim/src/up_internal.h
+++ b/arch/sim/src/up_internal.h
@@ -107,6 +107,11 @@ extern void up_registerblockdevice(void);

 extern char *up_deviceimage(void);

+/* up_stdio.c *************************************************************/
+
+extern size_t up_hostread(void *buffer, size_t len);
+extern size_t up_hostwrite(const void *buffer, size_t len);
+
 /* up_tapdev.c ************************************************************/

 #ifdef CONFIG_NET 
--- a/arch/sim/src/up_interruptcontext.c
+++ b/arch/sim/src/up_interruptcontext.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_interruptcontext.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,40 +31,40 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
 #include <nuttx/arch.h>
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_interrupt_context
 *
 * Description:
 *   Return TRUE is we are currently executing in
 *   the interrupt handler context.
- ************************************************************/
+ ****************************************************************************/

 boolean up_interrupt_context(void)
 {
--- a/arch/sim/src/up_releasepending.c
+++ b/arch/sim/src/up_releasepending.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_releasepending.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -45,23 +45,23 @@
 #include "os_internal.h"
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_release_pending
 *
 * Description:
@@ -70,7 +70,7 @@
 *   context switch if a new task is placed at the head of
 *   the ready to run list.
 *
- ************************************************************/
+ ****************************************************************************/

 void up_release_pending(void)
 {
--- a/arch/sim/src/up_releasestack.c
+++ b/arch/sim/src/up_releasestack.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_releasestack.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -43,30 +43,30 @@
 #include <nuttx/arch.h>
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_release_stack
 *
 * Description:
 *   A task has been stopped. Free all stack
 *   related resources retained int the defunct TCB.
 *
- ************************************************************/
+ ****************************************************************************/

 void up_release_stack(_TCB *dtcb)
 {
--- a/arch/sim/src/up_reprioritizertr.c
+++ b/arch/sim/src/up_reprioritizertr.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_reprioritizertr.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -45,23 +45,23 @@
 #include "os_internal.h"
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_reprioritize_rtr
 *
 * Description:
@@ -79,7 +79,7 @@
 *   tcb: The TCB of the task that has been reprioritized
 *   priority: The new task priority
 *
- ************************************************************/
+ ****************************************************************************/

 void up_reprioritize_rtr(_TCB *tcb, ubyte priority)
 {
--- a/arch/sim/src/up_schedulesigaction.c
+++ b/arch/sim/src/up_schedulesigaction.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_schedulesigaction.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -45,23 +45,23 @@
 #include "os_internal.h"
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_schedule_sigaction
 *
 * Description:
@@ -92,7 +92,7 @@
 *       currently executing task -- just call the signal
 *       handler now.
 *
- ************************************************************/
+ ****************************************************************************/

 void up_schedule_sigaction(_TCB *tcb, sig_deliver_t sigdeliver)
 {
--- a/arch/sim/src/up_stdio.c
+++ b/arch/sim/src/up_stdio.c
@@ -0,0 +1,82 @@
+/****************************************************************************
+ * up_stdio.c
+ *
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+size_t up_hostread(void *buffer, size_t len)
+{
+  /* Just map to the host fread() */
+
+  return fread(buffer, 1, len, stdout);
+}
+
+size_t up_hostwrite(const void *buffer, size_t len)
+{
+  /* Just map to the host fwrite() */
+
+  return fwrite(buffer, 1, len, stdout);
+}
+
+int up_putc(int ch)
+{
+  /* Just map to the host fputc routine */
+
+  return fputc(ch, stdout);
+}
+
--- a/arch/sim/src/up_tapdev.c
+++ b/arch/sim/src/up_tapdev.c
@@ -2,7 +2,7 @@
 /****************************************************************************
 * up_tapdev.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Based on code from uIP which also has a BSD-like license:
@@ -84,13 +84,6 @@ extern int lib_rawprintf(const char *format, ...);
 #  define UIP_IPADDR3   0
 #endif

-#define READ            3
-#define WRITE           4
-#define OPEN            5
-#define IOCTL           54
-#define SELECT          82
-#define SOCKETCALL      102
-
 /****************************************************************************
 * Private Types
 ****************************************************************************/
@@ -123,93 +116,6 @@ static int gtapdevfd;
 * Private Functions
 ****************************************************************************/

-/* This is REALLY awkward.. we need to compile using the system header files,
- * but we can't use any of the libc calls because all of the symbols are
- * defined for NuttX (read, write, etc)!  So we do hand rolled syscalls
- * to get to the Linux functions.
- */
-
-static inline int up_open(const char *filename, int flags, int mode)
-{
-  int result;
-
-  __asm__ volatile ("int $0x80" \
-                    : "=a" (result) \
-                    : "0" (OPEN), "b" ((int)(filename)), "c" ((int)(flags)), "d" ((int)(mode)) \
-                    : "memory");
-
-  return (int)result;
-}
-
-static inline int up_socketcall(int call, unsigned long *args)
-{
-  int result;
-
-  __asm__ volatile ("int $0x80" \
-                    : "=a" (result) \
-                    : "0" (SOCKETCALL), "b" (call), "c" ((int)args)	\
-                    : "memory");
-
-  return (int)result;
-}
-
-static inline int up_socket(int domain, int type, int protocol)
-{
-  unsigned long args[3];
-  args[0] = domain;
-  args[1] = type;
-  args[2] = protocol;
-  return up_socketcall(SYS_SOCKET, args);  
-}
-
-static inline int up_read(int fd, void* buf, size_t count)
-{
-  ssize_t result;
-
-  __asm__ volatile ("int $0x80" \
-                    : "=a" (result) \
-                    : "0" (READ), "b" ((int)(fd)), "c" ((int)(buf)), "d" ((int)(count)) \
-                    : "memory");
-
-  return (int)result;
-}
-
-static inline int up_write(int fd, const void* buf, size_t count)
-{
-  ssize_t result;
-
-  __asm__ volatile ("int $0x80" \
-                    : "=a" (result) \
-                    : "0" (WRITE), "b" ((int)(fd)), "c" ((int)(buf)), "d" ((int)(count)) \
-                    : "memory");
-
-  return (int)result;
-}
-
-static inline int up_ioctl(int fd, unsigned int cmd, unsigned long arg)
-{
-  ssize_t result;
-
-  __asm__ volatile ("int $0x80" \
-                    : "=a" (result) \
-                    : "0" (IOCTL), "b" ((int)(fd)), "c" ((int)(cmd)), "d" ((long)(arg)) \
-                    : "memory");
-
-  return (int)result;
-}
-
-static inline int up_select(struct sel_arg_struct *arg)
-{
-  ssize_t result;
-
-  __asm__ volatile ("int $0x80" \
-                    : "=a" (result) \
-                    : "0" (SELECT),"b" ((struct sel_arg_struct *)(arg))
-                    : "memory");
-
-  return (int)result;
-}
-
 #ifdef TAPDEV_DEBUG
 static inline void dump_ethhdr(const char *msg, unsigned char *buf, int buflen)
 {
@@ -246,7 +152,7 @@ void tapdev_init(void)

  /* Open the tap device */

-  gtapdevfd = up_open(DEVTAP, O_RDWR, 0644);
+  gtapdevfd = open(DEVTAP, O_RDWR, 0644);
  if (gtapdevfd < 0)
    {
      lib_rawprintf("TAPDEV: open failed: %d\n", -gtapdevfd );
@@ -257,7 +163,7 @@ void tapdev_init(void)

  memset(&ifr, 0, sizeof(ifr));
  ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
-  ret = up_ioctl(gtapdevfd, TUNSETIFF, (unsigned long) &ifr);
+  ret = ioctl(gtapdevfd, TUNSETIFF, (unsigned long) &ifr);
  if (ret < 0)
    {
      lib_rawprintf("TAPDEV: ioctl failed: %d\n", -ret );
@@ -278,7 +184,7 @@ int tapdev_getmacaddr(unsigned char *macaddr)
    {
      /* Get a socket (only so that we get access to the INET subsystem) */

-      int sockfd = up_socket(PF_INET, SOCK_DGRAM, 0);
+      int sockfd = socket(PF_INET, SOCK_DGRAM, 0);
      if (sockfd >= 0)
        {
          struct ifreq req;
@@ -290,7 +196,7 @@ int tapdev_getmacaddr(unsigned char *macaddr)

          /* Perform the ioctl to get the MAC address */

-          ret = up_ioctl(sockfd, SIOCGIFHWADDR, (unsigned long)&req);
+          ret = ioctl(sockfd, SIOCGIFHWADDR, (unsigned long)&req);
          if (!ret)
            {
              /* Return the MAC address */
@@ -304,7 +210,6 @@ int tapdev_getmacaddr(unsigned char *macaddr)

 unsigned int tapdev_read(unsigned char *buf, unsigned int buflen)
 {
-  struct sel_arg_struct arg;
  fd_set                fdset;
  struct timeval        tv;
  int                   ret;
@@ -324,19 +229,13 @@ unsigned int tapdev_read(unsigned char *buf, unsigned int buflen)
  FD_ZERO(&fdset);
  FD_SET(gtapdevfd, &fdset);

-  arg.n    = gtapdevfd + 1;
-  arg.inp  = &fdset;
-  arg.outp = NULL;
-  arg.exp  = NULL;
-  arg.tvp  = &tv;
-
-  ret = up_select(&arg);
+  ret = select(gtapdevfd + 1, &fdset, NULL, NULL, &tv);
  if(ret == 0)
    {
      return 0;
    }

-  ret = up_read(gtapdevfd, buf, buflen);
+  ret = read(gtapdevfd, buf, buflen);
  if (ret < 0)
    {
      lib_rawprintf("TAPDEV: read failed: %d\n", -ret);
@@ -361,7 +260,7 @@ void tapdev_send(unsigned char *buf, unsigned int buflen)
    }
 #endif

-  ret = up_write(gtapdevfd, buf, buflen);
+  ret = write(gtapdevfd, buf, buflen);
  if (ret < 0)
    {
      lib_rawprintf("TAPDEV: write failed: %d", -ret);
--- a/arch/sim/src/up_unblocktask.c
+++ b/arch/sim/src/up_unblocktask.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_unblocktask.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -46,23 +46,23 @@
 #include "os_internal.h"
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_unblock_task
 *
 * Description:
@@ -76,7 +76,7 @@
 *     the ready-to-run list and, if it is the highest priority
 *     ready to run taks, executed.
 *
- ************************************************************/
+ ****************************************************************************/

 void up_unblock_task(_TCB *tcb)
 {
--- a/arch/sim/src/up_usestack.c
+++ b/arch/sim/src/up_usestack.c
@@ -1,7 +1,7 @@
-/************************************************************
+/****************************************************************************
 * up_usestack.c
 *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * Redistribution and use in source and binary forms, with or without
@@ -14,7 +14,7 @@
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
- * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
@@ -31,11 +31,11 @@
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Included Files
- ************************************************************/
+ ****************************************************************************/

 #include <nuttx/config.h>
 #include <sys/types.h>
@@ -44,23 +44,23 @@
 #include "os_internal.h"
 #include "up_internal.h"

-/************************************************************
+/****************************************************************************
 * Private Definitions
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Private Data
- ************************************************************/
+ ****************************************************************************/

-/************************************************************
- * Private Funtions
- ************************************************************/
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/

-/************************************************************
- * Public Funtions
- ************************************************************/
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/

-/************************************************************
+/****************************************************************************
 * Name: up_use_stack
 *
 * Description:
@@ -79,7 +79,7 @@
 *   tcb: The TCB of new task
 *   stack_size: The allocated stack size.
 *
- ************************************************************/
+ ****************************************************************************/

 STATUS up_use_stack(_TCB *tcb, void *stack, size_t stack_size)
 {
--- a/arch/z80/include/ez80/arch.h
+++ b/arch/z80/include/ez80/arch.h
@@ -0,0 +1,77 @@
+/****************************************************************************
+ * arch/ez80/arch.h
+ * arch/chip/arch.h
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/* This file should never be included directed but, rather,
+ * only indirectly through nuttx/arch.h (via arch/arch.h)
+ */
+
+#ifndef __ARCH_EZ80_ARCH_H
+#define __ARCH_EZ80_ARCH_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ARCH_EZ80_ARCH_H */
+
--- a/arch/z80/include/ez80/io.h
+++ b/arch/z80/include/ez80/io.h
@@ -0,0 +1,87 @@
+/****************************************************************************
+ * arch/z80/include/ez80/io.h
+ * arch/chip/io.h
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/* This file should never be included directed but, rather, only indirectly
+ * through arch/io.h
+ */
+
+#ifndef __ARCH_EZ80_IO_H
+#define __ARCH_EZ80_IO_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Inline functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+EXTERN void outp(uint16 p, ubyte c);
+EXTERN ubyte inp(uint16 p);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+#endif /* __ARCH_EZ80_IO_H */
--- a/arch/z80/include/ez80/irq.h
+++ b/arch/z80/include/ez80/irq.h
@@ -0,0 +1,258 @@
+/****************************************************************************
+ * arch/ez80/include/ez80/irq.h
+ * arch/chip/irq.h
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/* This file should never be included directed but, rather,
+ * only indirectly through nuttx/irq.h (via arch/irq.h)
+ */
+
+#ifndef __ARCH_EZ80_IRQ_H
+#define __ARCH_EZ80_IRQ_H
+
+#ifndef _EZ80F91
+#  error "Only the EZ80F91 is currently supported"
+#endif
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* ez80 Interrupt Numbers ***************************************************/
+
+#define EZ80_EMACRX_IRQ     (0) /* Vector 0x40 */
+#define EZ80_EMACTX_IRQ     (1) /* Vector 0x44 */
+#define EZ80_EMACSYS_IRQ    (2) /* Vector 0x48 */
+#define EZ80_PLL_IRQ        (3) /* Vector 0x4c */
+#define EZ80_FLASH_IRQ      (4) /* Vector 0x50 */
+
+#define EZ80_TIMER0_IRQ     (5) /* Vector Ox54 */
+#define EZ80_TIMER1_IRQ     (6) /* Vector Ox58 */
+#define EZ80_TIMER2_IRQ     (7) /* Vector Ox5c */
+#define EZ80_TIMER3_IRQ     (8) /* Vector Ox60 */
+
+#define EZ80_RTC_IRQ        (9) /* Vector Ox6C */
+#define EZ80_UART0_IRQ     (10) /* Vector Ox70 */
+#define EZ80_UART1_IRQ     (11) /* Vector Ox74 */
+
+#define EZ80_I2C_IRQ       (12) /* Vector Ox78 */
+#define EZ80_SPI_IRQ       (13) /* Vector Ox7c */
+
+#define EZ80_PORTA0_IRQ    (14) /* Vector Ox80 */
+#define EZ80_PORTA1_IRQ    (15) /* Vector Ox84 */
+#define EZ80_PORTA2_IRQ    (16) /* Vector Ox88 */
+#define EZ80_PORTA3_IRQ    (17) /* Vector Ox8c */
+#define EZ80_PORTA4_IRQ    (18) /* Vector Ox90 */
+#define EZ80_PORTA5_IRQ    (19) /* Vector Ox94 */
+#define EZ80_PORTA6_IRQ    (20) /* Vector Ox98 */
+#define EZ80_PORTA7_IRQ    (21) /* Vector Ox9c */
+
+#define EZ80_PORTB0_IRQ    (22) /* Vector Oxa0 */
+#define EZ80_PORTB1_IRQ    (23) /* Vector Oxa4 */
+#define EZ80_PORTB2_IRQ    (24) /* Vector Oxa8 */
+#define EZ80_PORTB3_IRQ    (25) /* Vector Oxac */
+#define EZ80_PORTB4_IRQ    (26) /* Vector Oxb0 */
+#define EZ80_PORTB5_IRQ    (27) /* Vector Oxb4 */
+#define EZ80_PORTB6_IRQ    (28) /* Vector Oxb8 */
+#define EZ80_PORTB7_IRQ    (29) /* Vector Oxbc */
+
+#define EZ80_PORTC0_IRQ    (30) /* Vector Oxc0 */
+#define EZ80_PORTC1_IRQ    (31) /* Vector Oxc4 */
+#define EZ80_PORTC2_IRQ    (32) /* Vector Oxc8 */
+#define EZ80_PORTC3_IRQ    (33) /* Vector Oxcc */
+#define EZ80_PORTC4_IRQ    (34) /* Vector Oxd0 */
+#define EZ80_PORTC5_IRQ    (35) /* Vector Oxd4 */
+#define EZ80_PORTC6_IRQ    (36) /* Vector Oxd8 */
+#define EZ80_PORTC7_IRQ    (37) /* Vector Oxdc */
+
+#define EZ80_PORTD0_IRQ    (38) /* Vector Oxe0 */
+#define EZ80_PORTD1_IRQ    (39) /* Vector Oxe4 */
+#define EZ80_PORTD2_IRQ    (40) /* Vector Oxe8 */
+#define EZ80_PORTD3_IRQ    (41) /* Vector Oxec */
+#define EZ80_PORTD4_IRQ    (42) /* Vector Oxf0 */
+#define EZ80_PORTD5_IRQ    (43) /* Vector Oxf4 */
+#define EZ80_PORTD6_IRQ    (44) /* Vector Oxf8 */
+#define EZ80_PORTD7_IRQ    (45) /* Vector Oxfc */
+
+#define NR_IRQS            (46)
+#define EZ80_IRQ_SYSTIMER  EZ80_TIMER0_IRQ
+
+/* IRQ Management Macros ****************************************************/
+
+/* IRQ State Save Format ****************************************************
+ *
+ * These indices describe how the ez8 context is save in the state save array
+ *
+ * Byte offsets:
+ */
+
+/* IRQ Stack Frame Format
+ *
+ * This stack frame is created on each interrupt.  These registers are stored
+ * in the TCB to many context switches.
+ */
+
+/* chipreg_t indices */
+
+#define XCPT_I             (0)           /* Index 0: 16-bit interrupt vector register */
+#define XCPT_BC            (1)           /* Index 1: Saved 16-bit BC register */
+#define XCPT_DE            (2)           /* Index 2: Saved 16-bit DE register */
+#define XCPT_IX            (3)           /* Index 3: Saved 16-bit IX register */
+#define XCPT_IY            (4)           /* Index 4: Saved 16-bit IY register */
+#define XCPT_SP            (5)           /* Index 5: Saved 16-bit SP at time of interrupt */
+#define XCPT_HL            (6)           /* Index 6: Saved 16-bit HL register */
+#define XCPT_AF            (7)           /* Index 7: Saved 16-bit AF register */
+#define XCPT_PC            (8)           /* Index 8: Offset to 16-bit PC at time of interrupt */
+#define XCPTCONTEXT_REGS   (9)
+
+#ifdef CONFIG_EZ80_Z80MODE
+/* Byte offsets */
+
+#  define XCPT_I_OFFSET    (2*XCPT_I)    /* Offset 0: 16-bit interrupt vector register */
+#    define XCPT_IF_OFFSET (2*XCPT_I+0)  /* Offset 1: Saved flags. P set if interrupts enabled */
+#    define XCPT_IA_OFFSET (2*XCPT_I+1)  /* Offset 2: Saved lower 8-bits of interrupt vector register */
+#  define XCPT_BC_OFFSET   (2*XCPT_BC)   /* Offset 2: Saved 16-bit BC register */
+#    define XCPT_C_OFFSET  (2*XCPT_BC+0) /* Offset 2: Saved 8-bit C register */
+#    define XCPT_B_OFFSET  (2*XCPT_BC+1) /* Offset 3: Saved 8-bit D register */
+#  define XCPT_DE_OFFSET   (2*XCPT_DE)   /* Offset 4: Saved 16-bit DE register */
+#    define XCPT_E_OFFSET  (2*XCPT_DE+0) /* Offset 4: Saved 8-bit E register */
+#    define XCPT_D_OFFSET  (2*XCPT_DE+1) /* Offset 5: Saved 8-bit D register */
+#  define XCPT_IX_OFFSET   (2*XCPT_IX)   /* Offset 6: Saved 16-bit IX register */
+#  define XCPT_IY_OFFSET   (2*XCPT_IY)   /* Offset 8: Saved 16-bit IY register */
+#  define XCPT_SP_OFFSET   (2*XCPT_SP)   /* Offset 10: Saved 16-bit SP at time of interrupt */
+#  define XCPT_HL_OFFSET   (2*XCPT_HL)   /* Offset 12: Saved 16-bit HL register */
+#    define XCPT_L_OFFSET  (2*XCPT_HL+0) /* Offset 12: Saved 8-bit L register */
+#    define XCPT_H_OFFSET  (2*XCPT_HL+1) /* Offset 13: Saved 8-bit H register */
+#  define XCPT_AF_OFFSET   (2*XCPT_AF)   /* Offset 14: Saved 16-bit AF register */
+#    define XCPT_F_OFFSET  (2*XCPT_AF+0) /* Offset 14: Saved flags */
+#    define XCPT_A_OFFSET  (2*XCPT_AF+1) /* Offset 15: Saved 8-bit A register */
+#  define XCPT_PC_OFFSET   (2*XCPT_PC)   /* Offset 16: Offset to 16-bit PC at time of interrupt */
+#  define XCPTCONTEXT_SIZE (2*XCPTCONTEXT_REGS)
+#else
+/* Byte offsets */
+
+#  define XCPT_I_OFFSET  (3*XCPT_I)      /* Offset 0: Saved 24-bit interrupt vector register */
+#    define XCPT_IF_OFFSET (2*XCPT_I+1)  /* Offset 1: Saved flags. P set if interrupts enabled */
+#    define XCPT_IA_OFFSET (2*XCPT_I+2)  /* Offset 2: Saved lower 8-bits of interrupt vector register */
+#  define XCPT_BC_OFFSET   (3*XCPT_BC)   /* Offset 3: Saved 24-bit BC register */
+#    define XCPT_C_OFFSET  (3*XCPT_BC+1) /* Offset 4: Saved 8-bit C register */
+#    define XCPT_B_OFFSET  (3*XCPT_BC+2) /* Offset 5: Saved 8-bit D register */
+#  define XCPT_DE_OFFSET   (3*XCPT_DE)   /* Offset 6: Saved 24-bit DE register */
+#    define XCPT_E_OFFSET  (3*XCPT_DE+1) /* Offset 7: Saved 8-bit E register */
+#    define XCPT_D_OFFSET  (3*XCPT_DE+2) /* Offset 8: Saved 8-bit D register */
+#  define XCPT_IX_OFFSET   (3*XCPT_IX)   /* Offset 9: Saved 24-bit IX register */
+#  define XCPT_IY_OFFSET   (3*XCPT_IY)   /* Offset 12: Saved 24-bit IY register */
+#  define XCPT_SP_OFFSET   (3*XCPT_SP)   /* Offset 15: Saved 24-bit SP at time of interrupt */
+#  define XCPT_HL_OFFSET   (3*XCPT_HL)   /* Offset 18: Saved 24-bit HL register */
+#    define XCPT_L_OFFSET  (3*XCPT_HL+1) /* Offset 19: Saved 8-bit L register */
+#    define XCPT_H_OFFSET  (3*XCPT_HL+2) /* Offset 20: Saved 8-bit H register */
+#  define XCPT_AF_OFFSET   (3*XCPT_AF)   /* Offset 21: Saved AF register */
+#    define XCPT_F_OFFSET  (3*XCPT_AF+1) /* Offset 22: Saved AF register */
+#    define XCPT_A_OFFSET  (3*XCPT_AF+2) /* Offset 23: Saved 8-bit A register */
+#  define XCPT_PC_OFFSET   (3*XCPT_PC)   /* Offset 24: Offset to 24-bit PC at time of interrupt */
+#  define XCPTCONTEXT_SIZE (3*XCPTCONTEXT_REGS)
+#endif
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/* This is the type of the register save array */
+
+#ifdef CONFIG_EZ80_Z80MODE
+typedef uint16 chipreg_t;
+#else
+typedef uint24 chipreg_t;
+#endif
+
+/* This struct defines the way the registers are stored. */
+
+struct xcptcontext
+{
+  /* Register save area */
+
+  chipreg_t regs[XCPTCONTEXT_REGS];
+
+  /* The following function pointer is non-zero if there
+   * are pending signals to be processed.
+   */
+
+#ifndef CONFIG_DISABLE_SIGNALS
+  CODE void *sigdeliver; /* Actual type is sig_deliver_t */
+
+  /* The following retains that state during signal execution */
+
+  chipreg_t saved_pc;     /* Saved return address */
+  chipreg_t saved_irqctl; /* Saved interrupt state */
+#endif
+};
+#endif
+
+/****************************************************************************
+ * Inline functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+EXTERN irqstate_t irqsave(void);
+EXTERN void irqrestore(irqstate_t flags);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+#endif /* __ARCH_EZ80_IRQ_H */
+
--- a/arch/z80/include/ez80/types.h
+++ b/arch/z80/include/ez80/types.h
@@ -0,0 +1,95 @@
+/****************************************************************************
+ * arch/z80/include/ez80/types.h
+ * include/arch/chip/types.h
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/* This file should never be included directed but, rather, only indirectly
+ * through sys/types.h
+ */
+
+#ifndef __ARCH_CHIP_TYPES_H
+#define __ARCH_CHIP_TYPES_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Type Declarations
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/* These are the sizes of the types supported by the ZiLOG Z8Encore! compiler:
+ *
+ *   int    - 24-bits
+ *   short  - 16-bits
+ *   long   - 32-bits
+ *   char   - 8-bits
+ *   float  - 32-bits
+ *
+ * Pointers:
+ *
+ *   Z80 mode - 16 bits
+ *   ADL mode - 24 bits
+ */
+
+typedef char sbyte;
+typedef unsigned char ubyte;
+typedef unsigned char uint8;
+typedef unsigned char boolean;
+typedef short sint16;
+typedef unsigned short uint16;
+typedef int sint24;
+typedef unsigned int uint24;
+typedef long sint32;
+typedef unsigned long uint32;
+
+/* This is the size of the interrupt state save returned by irqsave().
+ * It holds the AF regiser pair + a zero pad byte
+ */
+
+typedef uint24 irqstate_t;
+
+#endif /* __ASSEMBLY__ */
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+#endif /* __ARCH_CHIP_TYPES_H */
--- a/arch/z80/src/Makefile.sdcc
+++ b/arch/z80/src/Makefile.sdcc
@@ -208,9 +208,9 @@ endif
 nuttx$(EXEEXT): pass1.ihx nuttx.ihx
 	@rm -f pass1.*
 	@cp -f nuttx.map $(TOPDIR)/.
-ifeq ($(EXEEXT),.CMD)
+ifeq ($(EXEEXT),.cmd)
 	sed s/:00000001FF/:00520001AD/ nuttx.ihx | \
-	hex2cmd > $(TOPDIR)/NUTTX.CMD
+	hex2cmd > $(TOPDIR)/nuttx.cmd
 else
 	@packihx nuttx.ihx > $(TOPDIR)/nuttx$(EXEEXT)
 endif
--- a/arch/z80/src/Makefile.zdsii
+++ b/arch/z80/src/Makefile.zdsii
@@ -45,12 +45,17 @@ LDFLAGS 	= @"${shell cygpath -w $(ARCHSRCDIR)/nuttx.linkcmd}"

 ############################################################################
 # Files and directories
-HEAD_ASRC	= $(HEAD_SSRC:.S=$(ASMEXT))
+ifneq ($(HEAD_SSRC),)
+HEAD_GENSRC	= $(HEAD_SSRC:.S=$(ASMEXT))
 HEAD_AOBJ	= $(HEAD_SSRC:.S=$(OBJEXT))
+else
+HEAD_AOBJ	= $(HEAD_ASRC:$(ASMEXT)=$(OBJEXT))
+endif

 SSRCS		= $(CHIP_SSRCS) $(CMN_SSRCS)
-ASRCS		= $(SSRCS:.S=$(ASMEXT))
-AOBJS		= $(SSRCS:.S=$(OBJEXT))
+ASRCS		= $(CHIP_ASRCS) $(CMN_ASRCS)
+GENSRCS		= $(SSRCS:.S=$(ASMEXT))
+AOBJS		= $(SSRCS:.S=$(OBJEXT)) $(ASRCS:$(ASMEXT)=$(OBJEXT))

 CSRCS		= $(CHIP_CSRCS) $(CMN_CSRCS)
 COBJS		= $(CSRCS:.c=$(OBJEXT))
@@ -66,13 +71,13 @@ VPATH		= chip:common
 # Targets
 all: $(HEAD_OBJ) libarch$(LIBEXT)

-$(ASRCS) $(HEAD_ASRC): %$(ASMEXT): %.S
+$(HEAD_GENSRC) $(GENSRCS) : %$(ASMEXT): %.S
 	@$(CPP) $(CPPFLAGS) $< -o $@.tmp
 	@cat $@.tmp | sed -e "s/^#/;/g" > $@
 	@rm $@.tmp

 $(AOBJS) $(HEAD_AOBJ): %$(OBJEXT): %$(ASMEXT)
-	$(call ASSEMBLE, $<, $@)
+	$(call ASSEMBLE, `cygpath -w $<`, $@)

 $(COBJS): %$(OBJEXT): %.c
 	$(call COMPILE, `cygpath -w $<`, $@)
@@ -101,10 +106,18 @@ ifeq ($(CONFIG_ARCH_CHIP_Z8F640X),y)
 	@echo "  \"${shell cygpath -w $(ZDSZILOGLIBDIR)/zsldevinitdummy$(LIBEXT)}\""  >>nuttx.linkcmd
 endif
 ifeq ($(CONFIG_ARCH_CHIP_Z8F642X),y)
-	@echo "  \"${shell cygpath -w $(ZDSSTDLIBDIR)/fpdumyLD$(LIBEXT)}\", \\"  >>nuttx.linkcmd
 	@echo "  \"${shell cygpath -w $(ZDSSTDLIBDIR)/chelpD$(LIBEXT)}\", \\"  >>nuttx.linkcmd
-	@echo "  \"${shell cygpath -w $(ZDSSTDLIBDIR)/csioLDD$(LIBEXT)}\", \\"  >>nuttx.linkcmd
-	@echo "  \"${shell cygpath -w $(ZDSSTDLIBDIR)/zsldevinitdummy.lib$(LIBEXT)}\" \\"  >>nuttx.linkcmd
+	@echo "  \"${shell cygpath -w $(ZDSSTDLIBDIR)/crtLDD$(LIBEXT)}\", \\"  >>nuttx.linkcmd
+	@echo "  \"${shell cygpath -w $(ZDSSTDLIBDIR)/fpdumyLD$(LIBEXT)}\", \\"  >>nuttx.linkcmd
+	@echo "  \"${shell cygpath -w $(ZDSZILOGLIBDIR)/csioLDD$(LIBEXT)}\", \\"  >>nuttx.linkcmd
+	@echo "  \"${shell cygpath -w $(ZDSZILOGLIBDIR)/zsldevinitdummy$(LIBEXT)}\""  >>nuttx.linkcmd
+endif
+ifeq ($(CONFIG_ARCH_CHIP_EZ80F91),y)
+	@echo "  \"${shell cygpath -w $(ZDSSTDLIBDIR)/chelp$(LIBEXT)}\", \\"  >>nuttx.linkcmd
+	@echo "  \"${shell cygpath -w $(ZDSSTDLIBDIR)/crt$(LIBEXT)}\", \\"  >>nuttx.linkcmd
+	@echo "  \"${shell cygpath -w $(ZDSSTDLIBDIR)/fplib$(LIBEXT)}\", \\"  >>nuttx.linkcmd
+	@echo "  \"${shell cygpath -w $(ZDSZILOGLIBDIR)/gpio$(LIBEXT)}\", \\"  >>nuttx.linkcmd
+	@echo "  \"${shell cygpath -w $(ZDSZILOGLIBDIR)/uartf91$(LIBEXT)}\""  >>nuttx.linkcmd
 endif

 nuttx$(EXEEXT): $(HEAD_AOBJ) board/libboard$(LIBEXT) nuttx.linkcmd
--- a/arch/z80/src/common/up_allocateheap.c
+++ b/arch/z80/src/common/up_allocateheap.c
@@ -47,40 +47,27 @@
 #include "up_arch.h"
 #include "up_internal.h"

+#ifdef SDCC
 /* For the SDCC toolchain, the arch/z80/src/Makefile will parse the map file
- * to determin how much memory is available for the heap.  This parsed data
+ * to determine how much memory is available for the heap.  This parsed data
 * is provided via the auto-generated file up_mem.h
 */

-#ifdef SDCC
 #  include "up_mem.h"
+
+#else
+/* For other toolchains, the architecture must provide a header file in the
+ * chip subdirectory to provide the heap parameters (if they are not defined
+ * in the configuration file )
+ */
+
+#  include "chip/up_mem.h"
 #endif

 /****************************************************************************
 * Definitions
 ****************************************************************************/

-/* For the ZiLOG ZDS-II toolchain(s), the heap will be set using linker-
- * defined values:
- *
- *   far_heapbot  : set to the offset to the first unused value in EDATA
- *   far_stacktop : set to the highest address in EDATA
- *
- * The top of the heap is then determined by the amount of stack setaside
- * in the NuttX configuration file
- */
-
-#ifdef __ZILOG__
-#  ifndef CONFIG_HEAP1_BASE
-     extern far unsigned long far_heapbot;
-#    define CONFIG_HEAP1_BASE ((uint16)&far_heapbot)
-#  endif
-#  ifndef CONFIG_HEAP1_END
-     extern far unsigned long far_stacktop;
-#    define CONFIG_HEAP1_END (((uint16)&far_stacktop) - CONFIG_PROC_STACK_SIZE + 1)
-#  endif
-#endif
-
 /****************************************************************************
 * Private Data
 ****************************************************************************/
--- a/arch/z80/src/ez80/Make.defs
+++ b/arch/z80/src/ez80/Make.defs
@@ -0,0 +1,54 @@
+############################################################################
+# arch/z80/src/ez80/Make.defs
+#
+#   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+HEAD_ASRC	= ez80_vectors.asm
+HEAD_SSRC	=
+
+CMN_SSRCS	= 
+CMN_CSRCS	= up_initialize.c up_allocateheap.c up_createstack.c \
+		  up_releasestack.c up_interruptcontext.c up_blocktask.c \
+		  up_unblocktask.c up_exit.c up_releasepending.c \
+		  up_reprioritizertr.c up_idle.c up_assert.c up_doirq.c \
+		  up_mdelay.c up_udelay.c up_usestack.c
+
+CHIP_ASRCS	= ez80_startup.asm ez80_io.asm ez80_irqsave.asm \
+		  ez80_saveusercontext.asm ez80_restorecontext.asm
+ifeq ($(CONFIG_ARCH_CHIP_EZ80F91),y)
+CHIP_ASRCS	+= ez80f91_init.asm
+endif
+CHIP_SSRCS	= 
+CHIP_CSRCS	= ez80_initialstate.c ez80_irq.c ez80_copystate.c \
+		  ez80_schedulesigaction.c ez80_sigdeliver.c ez80_timerisr.c \
+		  ez80_lowuart.c ez80_serial.c ez80_registerdump.c
--- a/arch/z80/src/ez80/chip.h
+++ b/arch/z80/src/ez80/chip.h
@@ -0,0 +1,272 @@
+/************************************************************************************
+ * arch/z80/src/ez80/chip.h
+ * arch/z80/src/chip/chip.h
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+#ifndef __EZ80_CHIP_H
+#define __EZ80_CHIP_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+
+/* Bits in the Z80 FLAGS register ***************************************************/
+
+#define EZ80_C_FLAG            0x01        /* Bit 0: Carry flag */
+#define EZ80_N_FLAG            0x02        /* Bit 1: Add/Subtract flag  */
+#define EZ80_PV_FLAG           0x04        /* Bit 2: Parity/Overflow flag */
+#define EZ80_H_FLAG            0x10        /* Bit 4: Half carry flag */
+#define EZ80_Z_FLAG            0x40        /* Bit 5: Zero flag */
+#define EZ80_S_FLAG            0x80        /* Bit 7: Sign flag */
+
+/* Timer Registers  *****************************************************************/
+
+#define EZ80_TMR0_CTL          0x60        /* RW: Timer 0 control register */
+#define EZ80_TMR0_IER          0x61        /* RW: Timer 0 interrupt enable register */
+#define EZ80_TMR0_IIR          0x62        /* R : Timer 0 interrupt ID register */
+#define EZ80_TMR0_DRL          0x63        /* R : Timer 0 data register (low) */
+#define EZ80_TMR0_DRH          0x64        /* R : Timer 0 data register (high) */
+#define EZ80_TMR0_RRL          0x63        /*  W: Timer 0 reload register (low) */
+#define EZ80_TMR0_RRH          0x64        /*  W: Timer 0 reload register (high) */
+
+#define EZ80_TMR1_CTL          0x65        /* RW: Timer 1 control register */
+#define EZ80_TMR1_IER          0x66        /* RW: Timer 1 interrupt enable register */
+#define EZ80_TMR1_IIR          0x67        /* R : Timer 1 interrupt ID register */
+#define EZ80_TMR1_DRL          0x68        /* R : Timer 1 data register (low) */
+#define EZ80_TMR1_DRH          0x69        /* R : Timer 1 data register (high) */
+#define EZ80_TMR1_RRL          0x68        /*  W: Timer 1 reload register (low) */
+#define EZ80_TMR1_RRH          0x69        /*  W: Timer 1 reload register (high) */
+#define EZ80_TMR1_CAPCTL       0x6a        /* RW: Timer 1 input capture control register */
+#define EZ80_TMR1_CAPAL        0x6b        /* R : Timer 1 capture input value A (low) */
+#define EZ80_TMR1_CAPAH        0x6c        /* R : Timer 1 capture input value A (high) */
+#define EZ80_TMR1_CAPBL        0x6d        /* R : Timer 1 capture input value B (low) */
+#define EZ80_TMR1_CAPBH        0x6e
+
+#define EZ80_TMR2_CTL          0x6f        /* RW: Timer 2 control register */
+#define EZ80_TMR2_IER          0x70        /* RW: Timer 2 interrupt enable register */
+#define EZ80_TMR2_IIR          0x71        /* R : Timer 2 interrupt ID register */
+#define EZ80_TMR2_DRL          0x72        /* R : Timer 2 data register (low) */
+#define EZ80_TMR2_DRH          0x73        /* R : Timer 2 data register (high) */
+#define EZ80_TMR2_RRL          0x72        /*  W: Timer 2 reload register (low) */
+#define EZ80_TMR2_RRH          0x73        /*  W: Timer 2 reload register (high) */
+
+#define EZ80_TMR3_CTL          0x74        /* RW: Timer 3 control register */
+#define EZ80_TMR3_IER          0x75        /* RW: Timer 3 interrupt enable register */
+#define EZ80_TMR3_IIR          0x76        /* R : Timer 3 interrupt ID register */
+#define EZ80_TMR3_DRL          0x77        /* R : Timer 3 data register (low) */
+#define EZ80_TMR3_DRH          0x78        /* R : Timer 3 data register (high) */
+#define EZ80_TMR3_RRL          0x77        /*  W: Timer 3 reload register (low) */
+#define EZ80_TMR3_RRH          0x78        /*  W: Timer 3 reload register (high) */
+#define EZ80_TMR3_CAPCTL       0x7b        /* RW: Timer 3 input capture control register */
+#define EZ80_TMR3_CAPAL        0x7c        /* R : Timer 3 capture input value A (low) */
+#define EZ80_TMR3_CAPAH        0x7d        /* R : Timer 3 capture input value A (high) */
+#define EZ80_TMR3_CAPBL        0x7e        /* R : Timer 3 capture input value B (low) */
+#define EZ80_TMR3_CAPBH        0x7f        /* R : Timer 3 capture input value B (high) */
+#define EZ80_TMR3_OCCTL1       0x80        /* RW: Timer 3 output compare control register1 */
+#define EZ80_TMR3_OCCTL2       0x81        /* RW: Timer 3 output compare control register2 */
+#define EZ80_TMR3_OC0L         0x82        /* RW: Timer 3 output compare value 0 (low) */
+#define EZ80_TMR3_OC0H         0x83        /* RW: Timer 3 output compare value 0 (high) */
+#define EZ80_TMR3_OC1L         0x84        /* RW: Timer 3 output compare value 1 (low) */
+#define EZ80_TMR3_OC1H         0x85        /* RW: Timer 3 output compare value 1 (high) */
+#define EZ80_TMR3_OC2L         0x86        /* RW: Timer 3 output compare value 2 (low) */
+#define EZ80_TMR3_OC2H         0x87        /* RW: Timer 3 output compare value 2 (high) */
+#define EZ80_TMR3_OC3L         0x88        /* RW: Timer 3 output compare value 3 (low) */
+#define EZ80_TMR3_OC3H         0x89        /* RW: Timer 3 output compare value 3 (high) */
+
+/* TMR0/1/2/3 CTL Register Bit Definitions *******************************************/
+
+#define EZ80_TMRCTL_BRKSTOP    0x80        /* Bit 7: Stop timer for debug operation */
+#define EZ80_TMRCTL_CLKSEL     0x60        /* Bits 6-5: Timer source */
+#  define EZ80_TMRCLKSEL_SYSCLK 0x00       /*   00: System clock divided by prescaler */
+#  define EZ80_TMRCLKSEL_RTC   0x20        /*   01: Real time clock input */
+#  define EZ80_TMRCLKSEL_ECF   0x40        /*   10: Event count input, falling edge */
+#  define EZ80_TMRCLKSEL_ECR   0x60        /*   11: Event count input, rising edge */
+#define EZ80_TMRCTL_CLKDIV     0x18        /* Bits 3-4: Sysem clock divider */
+#  define EZ80_TMRCLKDIV_4     0x00        /*   00:   4 */
+#  define EZ80_TMRCLKDIV_16    0x08        /*   01:  16 */
+#  define EZ80_TMRCLKDIV_64    0x10        /*   10:  64 */
+#  define EZ80_TMRCLKDIV_256   0x18        /*   11: 256 */
+#define EZ80_TMRCTL_TIMCONT    0x04        /* Bit 2: Continusous mode */
+#define EZ80_TMRCTL_RLD        0x02        /* Bit 1: Force reload */
+#define EZ80_TMRCTL_TIMEN      0x01        /* Bit 0: Programmable reload timer enabled */
+
+/* TMR0/1/2/3 IER Register Bit Definitions *******************************************/
+                                           /* Bit 7: Reserved */
+#define EZ80_TMRIER_OC3EN      0x40        /* Bit 6: TMR3 OC3 enabled */
+#define EZ80_TMRIER_OC2EN      0x20        /* Bit 5: TMR3 OC2 enabled */
+#define EZ80_TMRIER_OC1EN      0x10        /* Bit 4: TMR3 OC1 enabled */
+#define EZ80_TMRIER_OC0EN      0x08        /* Bit 3: TMR3 OC0 enabled */
+#define EZ80_TMRIER_ICBEN      0x04        /* Bit 2: TMR1/3 capture pin enabled */
+#define EZ80_TMRIER_ICAEN      0x02        /* Bit 1: TMR1/3 capture pin enabled */
+#define EZ80_TMRIER_EOCEN      0x01        /* Bit 0: End of count interrupt enabled */
+
+/* TMR0/1/2/3 IER Register Bit Definitions *******************************************/
+                                           /* Bit 7: Reserved */
+#define EZ80_TMRIIR_OC3        0x40        /* Bit 6: TMR3 OC3 */
+#define EZ80_TMRIIR_OC2        0x20        /* Bit 5: TMR3 OC2 */
+#define EZ80_TMRIIR_OC1        0x10        /* Bit 4: TMR3 OC1 */
+#define EZ80_TMRIIR_OC0        0x08        /* Bit 3: TMR3 OC0 */
+#define EZ80_TMRIIR_ICB        0x04        /* Bit 2: TMR1/3 capture pin */
+#define EZ80_TMRIIR_ICA        0x02        /* Bit 1: TMR1/3 capture pin */
+#define EZ80_TMRIIR_EOC        0x01        /* Bit 0: End of count interrupt */
+
+/* UART Register Offsets *************************************************************/
+                                           /* DLAB=0: */
+#define EZ80_UART_THR          0x00        /*    W: UART Transmit holding register */
+#define EZ80_UART_RBR          0x00        /*   R : UART Receive buffer register */
+#define EZ80_UART_IER          0x01        /*   RW: UART Interrupt enable register */
+                                           /* DLAB=1: */
+#define EZ80_UART_BRG          0x00        /*   RW: UART Baud rate generator register */
+#define EZ80_UART_BRGL         0x00        /*   RW: UART Baud rate generator register (low) */
+#define EZ80_UART_BRGH         0x01        /*   RW: UART Baud rate generator register (high) */
+                                           /* DLAB=N/A: */
+#define EZ80_UART_IIR          0x02        /*   R : UART Interrupt identification register */
+#define EZ80_UART_FCTL         0x02        /*    W: UART FIFO control register */
+#define EZ80_UART_LCTL         0x03        /*   RW: UART Line control register */
+#define EZ80_UART_MCTL         0x04        /*   RW: UART Modem control register */
+#define EZ80_UART_LSR          0x05        /*   R : UART Line status register */
+#define EZ80_UART_MSR          0x06        /*   R : UART Modem status register */
+#define EZ80_UART_SPR          0x07        /*   RW: UART Scratchpad register */
+
+/* UART0/1 Base Register Addresses **************************************************/
+
+#define EZ80_UART0_BASE        0xc0
+#define EZ80_UART1_BASE        0xd0
+
+/* UART0/1 IER register bits ********************************************************/
+
+#define EZ80_UARTEIR_INTMASK   0x1f         /* Bits 5-7: Reserved */
+#define EZ80_UARTEIR_TCIE      0x10         /* Bit 4: Transmission complete interrupt */
+#define EZ80_UARTEIR_MIIE      0x08         /* Bit 3: Modem status input interrupt */
+#define EZ80_UARTEIR_LSIE      0x04         /* Bit 2: Line status interrupt */
+#define EZ80_UARTEIR_TIE       0x02         /* Bit 1: Transmit interrupt */
+#define EZ80_UARTEIR_RIE       0x01         /* Bit 0: Receive interrupt */
+
+/* UART0/1 IIR register bits ********************************************************/
+
+#define EZ80_UARTIIR_FSTS      0x80         /* Bit 7: FIFO enable */
+                                            /* Bits 4-6: Reserved */
+#define EZ80_UARTIIR_INSTS     0x0e         /* Bits 1-3: Interrupt status code */
+#  define EZ80_UARTINSTS_CTO   0x0c         /*   110: Character timeout */
+#  define EZ80_UARTINSTS_TC    0x0a         /*   101: Transmission complete */
+#  define EZ80_UARTINSTS_RLS   0x06         /*   011: Receiver line status */
+#  define EZ80_UARTINSTS_RDR   0x04         /*   010: Receive data ready or trigger level */
+#  define EZ80_UARTINSTS_TBE   0x02         /*   001: Transmisson buffer empty */
+#  define EZ80_UARTINSTS_MS    0x00         /*   000: Modem status */
+#define EZ80_UARTIIR_INTBIT    0x01         /* Bit 0: Active interrupt source */
+#define EZ80_UARTIIR_CAUSEMASK 0x0f
+
+/* UART0/1 FCTL register bits *******************************************************/
+
+#define EZ80_UARTFCTL_TRIG     0xc0         /* Bits 6-7: UART recieve FIFO trigger level */
+#  define EZ80_UARTTRIG_1      0x00         /*   00: Receive FIFO trigger level=1 */
+#  define EZ80_UARTTRIG_4      0x40         /*   01: Receive FIFO trigger level=4 */
+#  define EZ80_UARTTRIG_8      0x80         /*   10: Receive FIFO trigger level=8 */
+#  define EZ80_UARTTRIG_14     0xc0         /*   11: Receive FIFO trigger level=14 */
+                                            /* Bit 3-5: Reserved */
+#define EZ80_UARTFCTL_CLRTxF   0x04         /* Bit 2: Transmit enable */
+#define EZ80_UARTFCTL_CLRRxF   0x02         /* Bit 1: Receive enable */
+#define EZ80_UARTFCTL_FIFOEN   0x01         /* Bit 0: Enable receive/transmit FIFOs */
+
+/* UART0/1 LCTL register bits *******************************************************/
+
+#define EZ80_UARTLCTL_DLAB     0x80         /* Bit 7: Enable access to baud rate generator */
+#define EZ80_UARTLCTL_SB       0x40         /* Bit 6: Send break */
+#define EZ80_UARTLCTL_FPE      0x20         /* Bit 5: Force parity error */
+#define EZ80_UARTLCTL_EPS      0x10         /* Bit 4: Even parity select */
+#define EZ80_UARTLCTL_PEN      0x08         /* Bit 3: Parity enable */
+#define EZ80_UARTLCTl_2STOP    0x04         /* Bit 2: 2 stop bits */
+#define EZ80_UARTLCTL_CHAR     0x03         /* Bits 0-2: Number of data bits */
+#  define EZ80_UARTCHAR_5BITS  0x00         /*   00: 5 data bits */
+#  define EZ80_UARTCHAR_6BITS  0x01         /*   01: 6 data bits */
+#  define EZ80_UARTCHAR_7BITS  0x02         /*   10: 7 data bits */
+#  define EZ80_UARTCHAR_8BITS  0x03         /*   11: 8 data bits */
+
+#define EZ80_UARTLCTL_MASK     0x3f
+
+/* UART0/1 MCTL register bits *******************************************************/
+                                            /* Bit 7: Reserved */
+#define EZ80_UARTMCTL_POLARITY 0x40         /* Bit 6: Invert polarity of RxD and TxD */
+#define EZ80_UARTMCTL_MDM      0x20         /* Bit 5: Multi-drop mode enable */
+#define EZ80_UARTMCTL_LOOP     0x10         /* Bit 4: Loopback mode enable */
+#define EZ80_UARTMCTL_OUT2     0x08         /* Bit 3: (loopback mode only) */
+#define EZ80_UARTMCTL_OUT1     0x04         /* Bit 2: (loopback mode only) */
+#define EZ80_UARTMCTL_RTS      0x02         /* Bit 1: Request to send */
+#define EZ80_UARTMCTL_DTR      0x01         /* Bit 0: Data termnal read */
+
+/* UART0/1 LSR register bits ********************************************************/
+
+#define EZ80_UARTLSR_ERR       0x80         /* Bit 7: Error detected in FIFO */
+#define EZ80_UARTLSR_TEMT      0x40         /* Bit 6: Transmit FIFO empty and idle */
+#define EZ80_UARTLSR_THRE      0x20         /* Bit 5: Transmit FIFO empty */
+#define EZ80_UARTLSR_BI        0x10         /* Bit 4: Break on input */
+#define EZ80_UARTLSR_FE        0x08         /* Bit 3: Framing error */
+#define EZ80_UARTLSR_PE        0x04         /* Bit 2: Parity error */
+#define EZ80_UARTLSR_OE        0x02         /* Bit 1: Overrun error */
+#define EZ80_UARTLSR_DR        0x01         /* Bit 0: Data ready */
+
+/* UART0/1 MSR register bits ********************************************************/
+
+#define EZ80_UARTMSR_DCD       0x80         /* Bit 7: Data carrier detect */
+#define EZ80_UARTMSR_RI        0x40         /* Bit 6: Ring indicator */
+#define EZ80_UARTMSR_DSR       0x20         /* Bit 5: Data set ready */
+#define EZ80_UARTMSR_CTS       0x10         /* Bit 4: Clear to send */
+#define EZ80_UARTMSR_DDCD      0x08         /* Bit 3: Delta on DCD input */
+#define EZ80_UARTMSR_TERI      0x04         /* Bit 2: Trailing edge change on RI */
+#define EZ80_UARTMSR_DDSR      0x02         /* Bit 1: Delta on DSR input */
+#define EZ80_UARTMSR_DCTS      0x01         /* Bit 0: Delta on CTS input */
+
+/************************************************************************************
+ * Public Function Prototypes
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+#endif  /* __EZ80_CHIP_H */
--- a/arch/z80/src/ez80/ez80_copystate.c
+++ b/arch/z80/src/ez80/ez80_copystate.c
@@ -0,0 +1,79 @@
+/****************************************************************************
+ * arch/z80/src/ez80/ez80_copystate.c
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <arch/irq.h>
+
+#include "chip/switch.h"
+#include "os_internal.h"
+#include "up_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ez80_copystate
+ ****************************************************************************/
+
+/* Maybe a little faster than most memcpy's */
+
+void ez80_copystate(chipreg_t *dest, const chipreg_t *src)
+{
+  int i;
+  for (i = 0; i < XCPTCONTEXT_REGS; i++)
+    {
+      *dest++ = *src++;
+    }
+}
+
--- a/arch/z80/src/ez80/ez80_initialstate.c
+++ b/arch/z80/src/ez80/ez80_initialstate.c
@@ -0,0 +1,92 @@
+/****************************************************************************
+ * arch/z80/src/ez80/ez80_initialstate.c
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <string.h>
+#include <nuttx/arch.h>
+
+#include "chip/chip.h"
+#include "up_internal.h"
+#include "up_arch.h"
+
+/****************************************************************************
+ * Private Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_initial_state
+ *
+ * Description:
+ *   A new thread is being started and a new TCB
+ *   has been created. This function is called to initialize
+ *   the processor specific portions of the new TCB.
+ *
+ *   This function must setup the intial architecture registers
+ *   and/or  stack so that execution will begin at tcb->start
+ *   on the next context switch.
+ *
+ ****************************************************************************/
+
+void up_initial_state(_TCB *tcb)
+{
+  struct xcptcontext *xcp = &tcb->xcp;
+
+  /* Initialize the initial exception register context structure */
+
+  memset(xcp, 0, sizeof(struct xcptcontext));
+#ifndef CONFIG_SUPPRESS_INTERRUPTS
+  ((ubyte*)xcp->regs)[XCPT_IF_OFFSET]  = EZ80_PV_FLAG; /* Parity/Overflow flag will enable interrupts */
+#endif
+  xcp->regs[XCPT_SP] = (chipreg_t)tcb->adj_stack_ptr;
+  xcp->regs[XCPT_PC] = (chipreg_t)tcb->start;
+}
--- a/arch/z80/src/ez80/ez80_io.asm
+++ b/arch/z80/src/ez80/ez80_io.asm
@@ -0,0 +1,154 @@
+;**************************************************************************
+; arch/z80/src/ze80/ez80_io.c
+;
+;   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+;   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+;
+; Redistribution and use in source and binary forms, with or without
+; modification, are permitted provided that the following conditions
+; are met:
+;
+; 1. Redistributions of source code must retain the above copyright
+;    notice, this list of conditions and the following disclaimer.
+; 2. Redistributions in binary form must reproduce the above copyright
+;    notice, this list of conditions and the following disclaimer in
+;    the documentation and/or other materials provided with the
+;    distribution.
+; 3. Neither the name NuttX nor the names of its contributors may be
+;    used to endorse or promote products derived from this software
+;    without specific prior written permission.
+;
+; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+; FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+; COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+; BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+; OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+; AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+; ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+; POSSIBILITY OF SUCH DAMAGE.
+;
+;**************************************************************************
+
+;**************************************************************************
+; Global Symbols Imported
+;**************************************************************************
+
+;**************************************************************************
+; Global Symbols Expported
+;**************************************************************************
+
+	xdef	_outp
+	xdef	_inp
+
+;**************************************************************************
+; Global Symbols Expported
+;**************************************************************************
+
+	CONFIG_EZ80_Z80MODE equ 0
+
+;**************************************************************************
+; Code
+;**************************************************************************
+
+	segment CODE
+	.assume ADL=1
+
+;**************************************************************************
+; Name: void outp(uint16 p, ubyte c)
+;
+; Description:
+;   Output byte c on port p
+;
+;**************************************************************************
+
+_outp:
+	; Create a stack frame
+
+	push	ix
+	ld	ix, #0
+	add	ix, sp
+
+	; Get the arguments from the stack
+
+	.if CONFIG_EZ80_Z80MODE
+	; Stack looks like:
+	;
+	;	7-8	Unused
+	;	 6	Value
+	;	4-5	Port
+	;	2-3	Return address
+	; SP:	0-1	Caller's fame pointer
+
+	ld	bc, (ix + 4)	; Port
+	ld	a, (ix + 6)	; Value
+
+	.else
+	; Stack looks like:
+	;
+	;	10-11	Unused
+	;	 9	Value
+	;	 8	Unused
+	;	6-7	Port
+	;	3-5	Return address
+	; SP:	0-2	Caller's frame pointer
+
+	ld	bc, (ix + 6)	; Port (upper 8 bits not used)
+	ld	a, (ix + 9)	; Value
+
+	.endif
+
+	; Output the specified by to the specified 8-bit I/O address
+
+	out	(bc), a
+	pop	ix
+	ret
+
+;**************************************************************************
+; Name: ubyte inp(uint16 p)
+;
+; Description:
+;   Input byte from port p
+;
+;**************************************************************************
+
+_inp:
+	; Create a stack frame
+
+	push	ix
+	ld	ix, #0
+	add	ix, sp
+
+	; Get the arguments from the stack
+
+	.if CONFIG_EZ80_Z80MODE
+	; Stack looks like:
+	;
+	;	4-5	Port
+	;	2-3	Return address
+	; SP:	0-1	Caller's fame pointer
+
+	ld	bc, (ix + 4)	; Port
+
+	.else
+	; Stack looks like:
+	;
+	;	 8	Unused
+	;	6-7	Port
+	;	3-5	Return address
+	; SP:	0-2	Caller's frame pointer
+
+	ld	bc, (ix + 6)	; Port (upper 8 bits not used)
+
+	.endif
+
+	; Return port value in A
+
+	in	a, (bc)
+	pop	ix
+	ret
+
+	end
--- a/arch/z80/src/ez80/ez80_irq.c
+++ b/arch/z80/src/ez80/ez80_irq.c
@@ -0,0 +1,125 @@
+/****************************************************************************
+ * arch/z80/src/ez80/ez80_irq.c
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <nuttx/arch.h>
+#include <nuttx/irq.h>
+
+#include "chip/switch.h"
+#include "up_internal.h"
+
+/****************************************************************************
+ * Private Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/* This holds a references to the current interrupt level register storage
+ * structure.  If is non-NULL only during interrupt processing.
+ */
+
+chipreg_t *current_regs;
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_irqinitialize
+ ****************************************************************************/
+
+void up_irqinitialize(void)
+{
+  current_regs = NULL;
+  
+  /* And finally, enable interrupts */
+
+#ifndef CONFIG_SUPPRESS_INTERRUPTS
+  asm("ei");
+#endif
+}
+
+/****************************************************************************
+ * Name: up_disable_irq
+ *
+ * Description:
+ *   On many architectures, there are three levels of interrupt enabling: (1)
+ *   at the global level, (2) at the level of the interrupt controller,
+ *   and (3) at the device level.  In order to receive interrupts, they
+ *   must be enabled at all three levels.
+ *
+ *   This function implements disabling of the device specified by 'irq'
+ *   at the interrupt controller level if supported by the architecture
+ *   (irqsave() supports the global level, the device level is hardware
+ *   specific).
+ *
+ ****************************************************************************/
+
+void up_disable_irq(int irq)
+{
+  /* There are no ez80 interrupt controller settings to disable IRQs */
+}
+
+/****************************************************************************
+ * Name: up_enable_irq
+ *
+ * Description:
+ *   This function implements enabling of the device specified by 'irq'
+ *   at the interrupt controller level if supported by the architecture
+ *   (irqsave() supports the global level, the device level is hardware
+ *   specific).
+ *
+ ****************************************************************************/
+
+void up_enable_irq(int irq)
+{
+  /* There are no ez80 interrupt controller settings to enable IRQs */
+}
--- a/arch/z80/src/ez80/ez80_irqsave.asm
+++ b/arch/z80/src/ez80/ez80_irqsave.asm
@@ -0,0 +1,88 @@
+;**************************************************************************
+; arch/z80/src/ez80/ez80_irqsave.asm
+;
+;   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+;   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+;
+; Redistribution and use in source and binary forms, with or without
+; modification, are permitted provided that the following conditions
+; are met:
+;
+; 1. Redistributions of source code must retain the above copyright
+;    notice, this list of conditions and the following disclaimer.
+; 2. Redistributions in binary form must reproduce the above copyright
+;    notice, this list of conditions and the following disclaimer in
+;    the documentation and/or other materials provided with the
+;    distribution.
+; 3. Neither the name NuttX nor the names of its contributors may be
+;    used to endorse or promote products derived from this software
+;    without specific prior written permission.
+;
+; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+; FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+; COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+; BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+; OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+; AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+; ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+; POSSIBILITY OF SUCH DAMAGE.
+;
+;**************************************************************************
+
+;**************************************************************************
+; Global Symbols Imported
+;**************************************************************************
+
+;**************************************************************************
+; Global Symbols Expported
+;**************************************************************************
+
+	xdef	_irqsave
+	xdef	_irqrestore
+
+;**************************************************************************
+; Code
+;**************************************************************************
+
+	segment CODE
+	.assume ADL=1
+
+;**************************************************************************
+;* Name: irqstate_t irqsave(void)
+;*
+;* Description:
+;*   Disable all interrupts; return previous interrupt state
+;*
+;**************************************************************************
+
+_irqsave:
+	ld	a, i		; AF = interrupt state
+	di			; Interrupts are disabled (does not affect F)
+	push	af		; Transfer to HL via the stack
+	pop	hl		;
+	ret			; And return
+
+;**************************************************************************
+;* Name: void irqrestore(irqstate_t flags)
+;*
+;* Description:
+;*   Restore previous interrupt state
+;*
+;**************************************************************************
+
+_irqrestore:
+	di			; Assume disabled
+	pop	hl		; HL = return address
+	pop	af		; AF Parity bit holds interrupt state
+	jp	po, _disabled	; Skip over re-enable if Parity odd
+	ei			; Re-enable interrupts
+_disabled:
+	push	af		; Restore stack
+	push	hl		;
+	ret			; and return
+
+	end
--- a/arch/z80/src/ez80/ez80_lowuart.c
+++ b/arch/z80/src/ez80/ez80_lowuart.c
@@ -0,0 +1,191 @@
+/****************************************************************************
+ * arch/z80/src/ez80/ez80_loweruart.c
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <string.h>
+
+#include <arch/io.h>
+#include <nuttx/arch.h>
+#include <nuttx/sched.h>
+
+#include "chip/chip.h"
+#include "common/up_internal.h"
+
+#ifdef CONFIG_USE_LOWUARTINIT
+
+/****************************************************************************
+ * Private Definitions
+ ****************************************************************************/
+
+/* The system clock frequency is defined in the linkcmd file */
+
+extern unsigned long SYS_CLK_FREQ;
+#define _DEFCLK ((unsigned long)&SYS_CLK_FREQ)
+
+#ifdef CONFIG_UART0_SERIAL_CONSOLE
+#  define ez80_inp(offs)     inp((EZ80_UART0_BASE+(offs)))
+#  define ez80_outp(offs,val) outp((EZ80_UART0_BASE+(offs)), (val))
+#  define CONFIG_UART_BAUD      CONFIG_UART0_BAUD
+#  if CONFIG_UART0_BITS == 7
+#    define CONFIG_UART_BITS EZ80_UARTCHAR_7BITS
+#  else
+#    define CONFIG_UART_BITS EZ80_UARTCHAR_8BITS
+#  endif
+#  if CONFIG_UART0_2STOP != 0
+#    define CONFIG_UART_2STOP EZ80_UARTLCTl_2STOP
+#  else
+#    define CONFIG_UART_2STOP 0
+#  endif
+#  if CONFIG_UART0_PARITY == 1 /* Odd parity */
+#    define CONFIG_UART_PARITY EZ80_UARTLCTL_PEN
+#  elif CONFIG_UART0_PARITY == 2  /* Even parity */
+#    define CONFIG_UART_PARITY (EZ80_UARTLCTL_PEN|EZ80_UARTLCTL_EPS)
+#  else
+#    define CONFIG_UART_PARITY 0
+#  endif
+#else
+#  define ez80_inp(offs)     inp((EZ80_UART1_BASE+(offs)))
+#  define ez80_outp(offs.val) outp((EZ80_UART1_BASE+(offs)), (val))
+#  define CONFIG_UART_BAUD      CONFIG_UART1_BAUD
+#  if CONFIG_UART1_BITS == 7
+#    define CONFIG_UART_BITS EZ80_UARTCHAR_7BITS
+#  else
+#    define CONFIG_UART_BITS EZ80_UARTCHAR_8BITS
+#  endif
+#  if CONFIG_UART1_2STOP != 0
+#    define CONFIG_UART_2STOP EZ80_UARTLCTl_2STOP
+#  else
+#    define CONFIG_UART_2STOP 0
+#  endif
+#  if CONFIG_UART1_PARITY == 1 /* Odd parity */
+#    define CONFIG_UART_PARITY EZ80_UARTLCTL_PEN
+#  elif CONFIG_UART1_PARITY == 2  /* Even parity */
+#    define CONFIG_UART_PARITY (EZ80_UARTLCTL_PEN|EZ80_UARTLCTL_EPS)
+#  else
+#    define CONFIG_UART_PARITY 0
+#  endif
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+#ifndef CONFIG_SUPPRESS_UART_CONFIG
+static void ez80_setbaud(void)
+{
+  uint24 brg_divisor;
+  ubyte lctl;
+
+  /* The resulting BAUD and depends on the system clock frequency and the
+   * BRG divisor as follows:
+   *
+   * BAUD = SYSTEM_CLOCK_FREQUENCY / (16 * BRG_Divisor)
+   *
+   * Or
+   *
+   * BRG_Divisor = SYSTEM_CLOCK_FREQUENCY / 16 / BAUD
+   */
+
+   brg_divisor = ( _DEFCLK + (CONFIG_UART_BAUD << 3)) / (CONFIG_UART_BAUD << 4);
+
+   /* Set the DLAB bit to enable access to the BRG registers */
+
+   lctl = ez80_inp(EZ80_UART_LCTL);
+   lctl |= EZ80_UARTLCTL_DLAB;
+   ez80_outp(EZ80_UART_LCTL, lctl);
+
+   ez80_outp(EZ80_UART_BRGL, (ubyte)(brg_divisor & 0xff));
+   ez80_outp(EZ80_UART_BRGH, (ubyte)(brg_divisor >> 8));
+
+   lctl &= ~EZ80_UARTLCTL_DLAB;
+   ez80_outp(EZ80_UART_LCTL, lctl);
+}
+#endif /* CONFIG_SUPPRESS_UART_CONFIG */
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_lowuartinit
+ ****************************************************************************/
+
+void up_lowuartinit(void)
+{
+#ifndef CONFIG_SUPPRESS_UART_CONFIG
+  ubyte reg;
+
+  /* Disable interrupts from the UART */
+
+  reg = ez80_inp(EZ80_UART_IER);
+  reg &= ~EZ80_UARTEIR_INTMASK;
+  ez80_outp(EZ80_UART_IER, reg);
+
+  /* Set the baud rate */
+
+  ez80_setbaud();
+  ez80_outp(EZ80_UART_MCTL, 0);
+
+  /* Set the character properties */
+
+  reg = ez80_inp(EZ80_UART_LCTL);
+  reg &= ~EZ80_UARTLCTL_MASK;
+  reg |= (CONFIG_UART_BITS | CONFIG_UART_2STOP | CONFIG_UART_PARITY);
+  ez80_outp(EZ80_UART_LCTL, reg);
+
+  /* Enable and flush the receive FIFO */
+
+  reg = EZ80_UARTFCTL_FIFOEN;
+  ez80_outp(EZ80_UART_FCTL, reg);
+  reg |= (EZ80_UARTFCTL_CLRTxF|EZ80_UARTFCTL_CLRRxF);
+  ez80_outp(EZ80_UART_FCTL, reg);
+
+  /* Set the receive trigger level to 1 */
+
+  reg |= EZ80_UARTTRIG_1;
+  ez80_outp(EZ80_UART_FCTL, reg);
+#endif /* CONFIG_SUPPRESS_UART_CONFIG */
+}
+#endif /* CONFIG_USE_LOWUARTINIT */
--- a/arch/z80/src/ez80/ez80_registerdump.c
+++ b/arch/z80/src/ez80/ez80_registerdump.c
@@ -0,0 +1,103 @@
+/****************************************************************************
+ * arch/z80/src/ez80/ez80_registerdump.c
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <debug.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+
+#include "chip/switch.h"
+#include "os_internal.h"
+#include "up_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* Output debug info if stack dump is selected -- even if 
+ * debug is not selected.
+ */
+
+#ifdef CONFIG_ARCH_STACKDUMP
+# undef  lldbg
+# define lldbg lib_lowprintf
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: z80_registerdump
+ ****************************************************************************/
+
+#ifdef CONFIG_ARCH_STACKDUMP
+static void ez80_registerdump(void)
+{
+  if (current_regs)
+    {
+#ifdef CONFIG_EZ80_Z80MODE
+      lldbg("AF: %04x  I: %04x\n",
+            current_regs[XCPT_AF], current_regs[XCPT_I]);
+      lldbg("BC: %04x DE: %04x HL: %04x\n",
+            current_regs[XCPT_BC], current_regs[XCPT_DE], current_regs[XCPT_HL]);
+      lldbg("IX: %04x IY: %04x\n",
+            current_regs[XCPT_IX], current_regs[XCPT_IY]);
+      lldbg("SP: %04x PC: %04x\n"
+            current_regs[XCPT_SP], current_regs[XCPT_PC]);
+#else
+      lldbg("AF: %06x  I: %06x\n",
+            current_regs[XCPT_AF], current_regs[XCPT_I]);
+      lldbg("BC: %06x DE: %06x HL: %06x\n",
+            current_regs[XCPT_BC], current_regs[XCPT_DE], current_regs[XCPT_HL]);
+      lldbg("IX: %06x IY: %06x\n",
+            current_regs[XCPT_IX], current_regs[XCPT_IY]);
+      lldbg("SP: %06x PC: %06x\n"
+            current_regs[XCPT_SP], current_regs[XCPT_PC]);
+#endif
+    }
+}
+#endif
--- a/arch/z80/src/ez80/ez80_restorecontext.asm
+++ b/arch/z80/src/ez80/ez80_restorecontext.asm
@@ -0,0 +1,110 @@
+;**************************************************************************
+; arch/z80/src/ez80/ez80_restorcontext.asm
+;
+;   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+;   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+;
+; Redistribution and use in source and binary forms, with or without
+; modification, are permitted provided that the following conditions
+; are met:
+;
+; 1. Redistributions of source code must retain the above copyright
+;    notice, this list of conditions and the following disclaimer.
+; 2. Redistributions in binary form must reproduce the above copyright
+;    notice, this list of conditions and the following disclaimer in
+;    the documentation and/or other materials provided with the
+;    distribution.
+; 3. Neither the name NuttX nor the names of its contributors may be
+;    used to endorse or promote products derived from this software
+;    without specific prior written permission.
+;
+; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+; FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+; COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+; BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+; OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+; AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+; ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+; POSSIBILITY OF SUCH DAMAGE.
+;
+;**************************************************************************
+
+;**************************************************************************
+; Global Symbols Imported
+;**************************************************************************
+
+;**************************************************************************
+; Global Symbols Expported
+;**************************************************************************
+
+	xdef	_ez80_restorecontext
+
+;**************************************************************************
+; Code
+;**************************************************************************
+
+	segment	CODE
+	.assume ADL=1
+
+;**************************************************************************
+; ez80_restorecontext
+;**************************************************************************
+
+_ez80_restorecontext:
+	; On entry, stack contains return address (not used), then address
+	; of the register save structure
+
+	; Discard the return address, we won't be returning
+
+	pop	hl
+
+	; Get the address of the beginning of the state save area.  Each
+	; pop will increment to the next element of the structure
+
+	pop	hl		; BC = Address of save structure
+	ld	sp, hl		; SP points to top of storage area
+
+	; Disable interrupts while we muck with the alternative registers.  The
+	; Correct interrupt state will be restore below
+
+	di
+
+	; Restore registers.  HL points to the beginning of the reg structure to restore
+
+	ex	af, af'			; Select alternate AF
+	pop	af			; Offset 0: AF' = I with interrupt state in carry
+	ex	af, af'			;   Restore original AF
+	pop	bc			; Offset 1: BC
+	pop	de			; Offset 2: DE
+	pop	ix			; Offset 3: IX
+	pop	iy			; Offset 4: IY
+	exx				;   Use alternate BC/DE/HL
+	pop	hl			; Offset 5: HL' = Stack pointer after return
+	exx				;   Restore original BC/DE/HL
+	pop	hl			; Offset 6: HL
+	pop	af			; Offset 7: AF
+
+	; Restore the stack pointer
+
+	exx				; Use alternate BC/DE/HL
+	pop	de			; DE' = return address
+	ld	sp, hl			; Set SP = saved stack pointer value before return
+	push	de			; Save return address for ret instruction
+	exx				; Restore original BC/DE/HL
+
+	; Restore interrupt state
+
+	ex	af, af'			; Recover interrupt state
+	jp	po, noinrestore		; No parity, IFF2=0, means disabled
+	ex	af, af'			; Restore AF (before enabling interrupts)
+	ei				; yes.. Enable interrupts
+	ret				; and return
+noinrestore:
+	ex	af, af'			; Restore AF
+	ret				; Return with interrupts disabled
+	end
+
--- a/arch/z80/src/ez80/ez80_saveusercontext.asm
+++ b/arch/z80/src/ez80/ez80_saveusercontext.asm
@@ -0,0 +1,172 @@
+;*************************************************************************
+; arch/z80/src/ez80/ez80_saveusercontext.asm
+;
+;   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+;   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+;
+; Redistribution and use in source and binary forms, with or without
+; modification, are permitted provided that the following conditions
+; are met:
+;
+; 1. Redistributions of source code must retain the above copyright
+;    notice, this list of conditions and the following disclaimer.
+; 2. Redistributions in binary form must reproduce the above copyright
+;    notice, this list of conditions and the following disclaimer in
+;    the documentation and/or other materials provided with the
+;    distribution.
+; 3. Neither the name NuttX nor the names of its contributors may be
+;    used to endorse or promote products derived from this software
+;    without specific prior written permission.
+;
+; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+; FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+; COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+; BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+; OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+; AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+; ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+; POSSIBILITY OF SUCH DAMAGE.
+;
+;*************************************************************************
+
+;**************************************************************************
+; Global Symbols Imported
+;**************************************************************************
+
+;**************************************************************************
+; Global Symbols Expported
+;**************************************************************************
+
+	xdef	_ez80_saveusercontext
+
+;*************************************************************************
+; Constants
+;*************************************************************************
+
+	CONFIG_EZ80_Z80MODE equ 0
+
+	.if CONFIG_EZ80_Z80MODE
+	; Register save area layout
+
+	XCPT_I		equ	2*0	; Offset 0: Saved I w/interrupt state in carry
+	XCPT_BC		equ	2*1	; Offset 1: Saved BC register
+	XCPT_DE		equ	2*2	; Offset 2: Saved DE register
+	XCPT_IX		equ	2*3	; Offset 3: Saved IX register
+	XCPT_IY		equ	2*4	; Offset 4: Saved IY register
+	XCPT_SP		equ	2*5	; Offset 5: Offset to SP at time of interrupt
+	XCPT_HL		equ	2*6	; Offset 6: Saved HL register
+	XCPT_AF		equ	2*7	; Offset 7: Saved AF register
+	XCPT_PC		equ	2*8	; Offset 8: Offset to PC at time of interrupt
+
+	; Stack frame
+
+	FRAME_IY	equ	2*0	; Location of IY on the stack
+	FRAME_IX	equ	2*1	; Location of IX on the stack
+	FRAME_RET	equ	2*2	; Location of return address on the stack
+	FRAME_REGS	equ	2*3	; Location of reg save area on stack
+
+	SP_OFFSET	equ	2*3
+	.else
+	; Register save area layout
+
+	XCPT_I		equ	3*0	; Offset 0: Saved I w/interrupt state in carry
+	XCPT_BC		equ	3*1	; Offset 1: Saved BC register
+	XCPT_DE		equ	3*2	; Offset 2: Saved DE register
+	XCPT_IX		equ	3*3	; Offset 3: Saved IX register
+	XCPT_IY		equ	3*4	; Offset 4: Saved IY register
+	XCPT_SP		equ	3*5	; Offset 5: Offset to SP at time of interrupt
+	XCPT_HL		equ	3*6	; Offset 6: Saved HL register
+	XCPT_AF		equ	3*7	; Offset 7: Saved AF register
+	XCPT_PC		equ	3*8	; Offset 8: Offset to PC at time of interrupt	.endif
+
+	; Stack frame
+
+	FRAME_IY	equ	3*0	; Location of IY on the stack
+	FRAME_IX	equ	3*1	; Location of IX on the stack
+	FRAME_RET	equ	3*2	; Location of return address on the stack
+	FRAME_REGS	equ	3*3	; Location of reg save area on stack
+
+	SP_OFFSET	equ	3*3
+	.endif
+
+;**************************************************************************
+; Code
+;**************************************************************************
+
+	segment	CODE
+	.assume ADL=1
+
+;*************************************************************************
+; Name: z80_saveusercontext
+;*************************************************************************
+
+_ez80_saveusercontext:
+	; Set up a stack frame
+
+	push	ix			; Save IX and IY
+	push	iy
+	ld	ix, #0
+	add	ix, sp			; IX = stack frame
+
+	; Fetch the address of the save area
+
+	ld	de, (ix + FRAME_REGS)	; DE = save area address
+	ld	iy, #0
+	add	iy, de			; IY = save area address
+
+	; Then save the registers
+
+	; Save the current interrupt state at offset 0
+
+	ld	a, i			; Get interrupt state
+	push	af
+	pop	hl
+	ld	(iy + XCPT_I), hl	; Index 0: I w/interrupt state in parity/overflow
+
+	; Save BC at offset 1
+
+	ld	(iy + XCPT_BC), bc	; Index 1: BC
+
+	; DE is not preserved (Index 2)
+
+	; Save IX at offset 3
+
+	ld	hl, (ix + FRAME_IX)	; HL = Saved alue of IX
+	ld	(iy + XCPT_IX), hl	; Index 3: IX
+
+	; Save IY at index 4
+
+	ld	hl, (ix + FRAME_IY)	; HL = Saved value of IY
+	ld	(iy + XCPT_IY), hl	; Index 4: IY
+
+	; Save that stack pointer as it would be upon return in offset 5
+
+	ld	hl, #SP_OFFSET		; Value of stack pointer on return
+	add	hl, sp
+	ld	(iy + XCPT_SP), hl	; Index 5 SP
+
+	; HL is saved as the value 1 at offset 6
+
+	ld	hl, #1
+	ld	(iy + XCPT_HL), hl	; Index 2: HL on return (=1)
+
+	; AF is not preserved (offset 7)
+
+	; Save the return address at index 8
+
+	ld	hl, (ix + FRAME_RET)	; HL = Saved return address
+	ld	(iy + XCPT_PC), hl	; Index 8: PC
+
+	; Return the value 0
+
+	ld	hl, #0
+
+	pop	iy
+	pop	ix
+	ret
+	end
+	
--- a/arch/z80/src/ez80/ez80_schedulesigaction.c
+++ b/arch/z80/src/ez80/ez80_schedulesigaction.c
@@ -0,0 +1,192 @@
+/****************************************************************************
+ * arch/z80/src/ez80/ez80_schedulesigaction.c
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <sched.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+#include <arch/irq.h>
+
+#include "chip/switch.h"
+#include "os_internal.h"
+#include "up_internal.h"
+
+#ifndef CONFIG_DISABLE_SIGNALS
+
+/****************************************************************************
+ * Private Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ez80_sigsetup
+ ****************************************************************************/
+
+static void ez80_sigsetup(FAR _TCB *tcb, sig_deliver_t sigdeliver, FAR chipreg_t *regs)
+{
+  /* Save the return address and interrupt state. These will be restored by
+   * the signal trampoline after the signals have been delivered.
+   */
+
+  tcb->xcp.sigdeliver    = sigdeliver;
+  tcb->xcp.saved_pc      = regs[XCPT_PC];
+  tcb->xcp.saved_i       = regs[XCPT_I];
+
+  /* Then set up to vector to the trampoline with interrupts disabled */
+
+  regs[XCPT_PC]  = (chipreg_t)up_sigdeliver;
+  regs[XCPT_I]   = 0;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_schedule_sigaction
+ *
+ * Description:
+ *   This function is called by the OS when one or more
+ *   signal handling actions have been queued for execution.
+ *   The architecture specific code must configure things so
+ *   that the 'igdeliver' callback is executed on the thread
+ *   specified by 'tcb' as soon as possible.
+ *
+ *   This function may be called from interrupt handling logic.
+ *
+ *   This operation should not cause the task to be unblocked
+ *   nor should it cause any immediate execution of sigdeliver.
+ *   Typically, a few cases need to be considered:
+ *
+ *   (1) This function may be called from an interrupt handler
+ *       During interrupt processing, all xcptcontext structures
+ *       should be valid for all tasks.  That structure should
+ *       be modified to invoke sigdeliver() either on return
+ *       from (this) interrupt or on some subsequent context
+ *       switch to the recipient task.
+ *   (2) If not in an interrupt handler and the tcb is NOT
+ *       the currently executing task, then again just modify
+ *       the saved xcptcontext structure for the recipient
+ *       task so it will invoke sigdeliver when that task is
+ *       later resumed.
+ *   (3) If not in an interrupt handler and the tcb IS the
+ *       currently executing task -- just call the signal
+ *       handler now.
+ *
+ ****************************************************************************/
+
+void up_schedule_sigaction(FAR _TCB *tcb, sig_deliver_t sigdeliver)
+{
+  dbg("tcb=0x%p sigdeliver=0x%04x\n", tcb, (uint16)sigdeliver);
+
+  /* Refuse to handle nested signal actions */
+
+  if (tcb->xcp.sigdeliver == NULL)
+    {
+      irqstate_t flags;
+
+      /* Make sure that interrupts are disabled */
+
+      flags = irqsave();
+
+      /* First, handle some special cases when the signal is being delivered
+       * to the currently executing task.
+       */
+
+      if (tcb == (FAR _TCB*)g_readytorun.head)
+        {
+          /* CASE 1:  We are not in an interrupt handler and a task is
+           * signalling itself for some reason.
+           */
+
+          if (!IN_INTERRUPT())
+            {
+              /* In this case just deliver the signal now. */
+
+              sigdeliver(tcb);
+            }
+
+          /* CASE 2:  We are in an interrupt handler AND the interrupted task
+           * is the same as the one that must receive the signal, then we
+           * will have to modify the return state as well as the state in
+           * the TCB.
+           */
+
+          else
+            {
+              /* Set up to vector to the trampoline with interrupts disabled. */
+
+              ez80_sigsetup(tcb, sigdeliver, IRQ_STATE());
+
+              /* And make sure that the saved context in the TCB
+               * is the same as the interrupt return context.
+               */
+
+              SAVE_IRQCONTEXT(tcb);
+            }
+        }
+
+      /* Otherwise, we are (1) signaling a task is not running from an interrupt
+       * handler or (2) we are not in an interrupt handler and the running task
+       * is signalling some non-running task.
+       */
+
+      else
+        {
+          /* Set up to vector to the trampoline with interrupts disabled. */
+
+          ez80_sigsetup(tcb, sigdeliver, tcb->xcp.regs);
+        }
+
+      irqrestore(flags);
+    }
+}
+
+#endif /* CONFIG_DISABLE_SIGNALS */
+
--- a/arch/z80/src/ez80/ez80_serial.c
+++ b/arch/z80/src/ez80/ez80_serial.c
--- a/arch/z80/src/ez80/ez80_sigdeliver.c
+++ b/arch/z80/src/ez80/ez80_sigdeliver.c
@@ -0,0 +1,141 @@
+/****************************************************************************
+ * arch/z80/src/ez80/ez80_sigdeliver.c
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <sched.h>
+#include <debug.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+
+#include "chip/switch.h"
+#include "os_internal.h"
+#include "up_internal.h"
+
+#ifndef CONFIG_DISABLE_SIGNALS
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_sigdeliver
+ *
+ * Description:
+ *   This is the a signal handling trampoline.  When a
+ *   signal action was posted.  The task context was mucked
+ *   with and forced to branch to this location with interrupts
+ *   disabled.
+ *
+ ****************************************************************************/
+
+void up_sigdeliver(void)
+{
+#ifndef CONFIG_DISABLE_SIGNALS
+  FAR _TCB  *rtcb = (_TCB*)g_readytorun.head;
+  chipret_t regs[XCPTCONTEXT_REGS];
+  sig_deliver_t sigdeliver;
+
+  /* Save the errno.  This must be preserved throughout the signal handling
+   * so that the the user code final gets the correct errno value (probably
+   * EINTR).
+   */
+
+  int saved_errno = rtcb->pterrno;
+
+  up_ledon(LED_SIGNAL);
+
+  dbg("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
+       rtcb, rtcb->xcp.sigdeliver, rtcb->sigpendactionq.head);
+  ASSERT(rtcb->xcp.sigdeliver != NULL);
+
+  /* Save the real return state on the stack. */
+
+  z80_copystate(regs, rtcb->xcp.regs);
+  regs[XCPT_PC] = rtcb->xcp.saved_pc;
+  regs[XCPT_I]  = rtcb->xcp.saved_i;
+
+  /* Get a local copy of the sigdeliver function pointer.  We do this so
+   * that we can nullify the sigdeliver function point in the TCB and accept
+   * more signal deliveries while processing the current pending signals.
+   */
+
+  sigdeliver           = rtcb->xcp.sigdeliver;
+  rtcb->xcp.sigdeliver = NULL;
+
+  /* Then restore the task interrupt state. */
+
+  irqrestore(regs[XCPT_I]);
+
+  /* Deliver the signals */
+
+  sigdeliver(rtcb);
+
+  /* Output any debug messaged BEFORE restoring errno (because they may alter
+   * errno), then restore the original errno that is needed by the user logic
+   * (it is probably EINTR).
+   */
+
+  dbg("Resuming\n");
+  rtcb->pterrno = saved_errno;
+
+  /* Then restore the correct state for this thread of
+   * execution.
+   */
+
+  up_ledoff(LED_SIGNAL);
+  z80_restoreusercontext(regs);
+#endif
+}
+
+#endif /* CONFIG_DISABLE_SIGNALS */
--- a/arch/z80/src/ez80/ez80_startup.asm
+++ b/arch/z80/src/ez80/ez80_startup.asm
@@ -0,0 +1,155 @@
+;**************************************************************************
+; arch/z80/src/ez80/ez80_startup.asm
+;
+;   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+;   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+;
+; Redistribution and use in source and binary forms, with or without
+; modification, are permitted provided that the following conditions
+; are met:
+;
+; 1. Redistributions of source code must retain the above copyright
+;    notice, this list of conditions and the following disclaimer.
+; 2. Redistributions in binary form must reproduce the above copyright
+;    notice, this list of conditions and the following disclaimer in
+;    the documentation and/or other materials provided with the
+;    distribution.
+; 3. Neither the name NuttX nor the names of its contributors may be
+;    used to endorse or promote products derived from this software
+;    without specific prior written permission.
+;
+; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+; FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+; COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+; BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+; OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+; AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+; ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+; POSSIBILITY OF SUCH DAMAGE.
+;
+;**************************************************************************
+
+;**************************************************************************
+; Included Files
+;**************************************************************************
+
+;**************************************************************************
+; Constants
+;**************************************************************************
+
+;**************************************************************************
+; Global symbols used
+;**************************************************************************
+
+	xref	__stack
+	xref	_ez80_init
+	xref	_ez80_initvectors
+	xref	_ez80_initsysclk
+	xref	_ez80_lowinit
+	xref	__low_bss	; Low address of bss segment
+	xref	__len_bss	; Length of bss segment
+
+	xref	__low_data	; Address of initialized data section
+	xref	__low_romdata	; Addr of initialized data section in ROM
+	xref	__len_data	; Length of initialized data section
+
+	xref	__copy_code_to_ram
+	xref	__len_code
+	xref	__low_code
+	xref	__low_romcode
+	xref	_os_start
+	xdef	_ez80_startup
+	xdef	_ez80_halt
+
+;**************************************************************************
+; Code
+;**************************************************************************
+
+	segment	CODE
+	.assume ADL=1
+
+;**************************************************************************
+; System reset start logic
+;**************************************************************************
+
+_ez80_startup:
+	; Set up the stack pointer at the location determined the lincmd
+	; file
+
+	ld	sp, __stack
+
+	; Peform chip-specific initialization
+
+	call	_ez80_init
+
+	; initialize the interrupt vector table
+
+	call 	_ez80_initvectors
+
+	; Initialize the system clock
+
+	call	_ez80_initsysclk
+
+	; Perform C initializations
+	; Clear the uninitialized data section
+
+	ld	bc, __len_bss		; Check for non-zero length
+	ld	a, __len_bss >> 16
+	or	a, c
+	or	a, b
+	jr	z, _ez80_bssdone	; BSS is zero-length ...
+	xor	a, a
+	ld	(__low_bss), a
+	sbc	hl, hl			; hl = 0
+	dec	bc			; 1st byte's taken care of
+	sbc	hl, bc
+	jr	z, _ez80_bssdone	; Just 1 byte ...
+	ld	hl, __low_bss		; reset hl
+	ld	de, __low_bss + 1	; [de] = bss + 1
+	ldir
+_ez80_bssdone:
+
+	; Copy the initialized data section
+	ld	bc, __len_data		; [bc] = data length
+	ld	a, __len_data >> 16	; Check for non-zero length
+	or	a, c
+	or	a, b
+	jr	z, _ez80_datadone	; __len_data is zero-length ...
+	ld	hl, __low_romdata	; [hl] = data_copy
+	ld	de, __low_data		; [de] = data
+	ldir				; Copy the data section
+_ez80_datadone:
+
+	; Copy CODE (which may be in FLASH) to RAM if the
+	; copy_code_to_ram symbol is set in the link control file
+	ld	a, __copy_code_to_ram
+	or	a, a
+	jr	z, _ez80_codedone
+	ld	bc, __len_code		; [bc] = code length
+	ld	a, __len_code >> 16	; Check for non-zero length
+	or	a, c
+	or	a, b
+	jr	z, _ez80_codedone	; __len_code is zero-length
+	ld	hl, __low_romcode	; [hl] = code_copy
+	ld	de, __low_code		; [de] = code
+	ldir				; Copy the code section
+_ez80_codedone:
+
+	; Perform board-specific intialization
+
+	call	_ez80_lowinit
+
+	; Then start NuttX
+
+	call	_os_start		; jump to the OS entry point
+
+	; NuttX will never return, but just in case...
+
+_ez80_halt:
+	halt				; We should never get here
+	jp	_ez80_halt
+
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
patacongo	03f04075c9	Prep for 0.3.12 release git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@809 42af7a65-404d-4744-a932-0658087f49c3	2008-08-10 17:44:27 +00:00
patacongo	5e49d8063a	Fixes for Z16F compiler git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@808 42af7a65-404d-4744-a932-0658087f49c3	2008-08-10 16:57:15 +00:00
patacongo	e2dd36627a	Added test for mkfatfs git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@807 42af7a65-404d-4744-a932-0658087f49c3	2008-08-10 16:36:33 +00:00
patacongo	871a684fc6	Added mkfatfs() test git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@806 42af7a65-404d-4744-a932-0658087f49c3	2008-08-10 14:50:27 +00:00
patacongo	dd7f63b94a	Implemented mkfatfs() git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@805 42af7a65-404d-4744-a932-0658087f49c3	2008-08-09 21:48:06 +00:00
patacongo	c6ad3e0d22	Added search for good cluster size git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@804 42af7a65-404d-4744-a932-0658087f49c3	2008-08-09 19:44:55 +00:00
patacongo	a88a6ecb67	Add FAT size calculation git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@803 42af7a65-404d-4744-a932-0658087f49c3	2008-08-09 15:55:42 +00:00
patacongo	8a30c6b64a	Continued mkfatfs work git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@802 42af7a65-404d-4744-a932-0658087f49c3	2008-08-05 23:52:44 +00:00
patacongo	9e1d3f8984	fleshing out mkfatfs logic git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@801 42af7a65-404d-4744-a932-0658087f49c3	2008-08-03 17:45:20 +00:00
patacongo	7089a04067	Support for mkfatfs() git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@800 42af7a65-404d-4744-a932-0658087f49c3	2008-08-02 20:59:48 +00:00
patacongo	360cc0a648	typos git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@799 42af7a65-404d-4744-a932-0658087f49c3	2008-08-02 17:22:22 +00:00
patacongo	0e44d93cd7	Move FAT-related files to fs/fat git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@798 42af7a65-404d-4744-a932-0658087f49c3	2008-08-02 15:02:10 +00:00
patacongo	08d439fefb	Fat directory git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@797 42af7a65-404d-4744-a932-0658087f49c3	2008-08-02 14:44:25 +00:00
patacongo	a5916b8df8	Add find/open/close_blockdriver() git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@796 42af7a65-404d-4744-a932-0658087f49c3	2008-08-02 14:25:34 +00:00
patacongo	5972a086d2	cosmetic git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@795 42af7a65-404d-4744-a932-0658087f49c3	2008-08-02 12:56:39 +00:00
patacongo	ab815f91f9	Simplication git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@794 42af7a65-404d-4744-a932-0658087f49c3	2008-08-01 02:17:32 +00:00
patacongo	2d52cdfac7	Fix missing lock in last change git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@793 42af7a65-404d-4744-a932-0658087f49c3	2008-08-01 01:59:11 +00:00
patacongo	6b1891dc83	Need to call driver close() method on exit git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@792 42af7a65-404d-4744-a932-0658087f49c3	2008-08-01 00:22:09 +00:00
patacongo	faf168d93c	Fix bug: Using unsigned to detect errno<0 git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@791 42af7a65-404d-4744-a932-0658087f49c3	2008-07-31 00:28:24 +00:00
patacongo	378b050ffa	Added redirection test git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@790 42af7a65-404d-4744-a932-0658087f49c3	2008-07-30 00:29:11 +00:00
patacongo	1c9cadf1c3	task_create now dup's all open descriptors git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@789 42af7a65-404d-4744-a932-0658087f49c3	2008-07-30 00:28:43 +00:00
patacongo	3043b0d5a1	Separate tests into separate files git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@788 42af7a65-404d-4744-a932-0658087f49c3	2008-07-29 22:11:08 +00:00
patacongo	4c89703789	Fix detection of final close git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@787 42af7a65-404d-4744-a932-0658087f49c3	2008-07-27 19:26:57 +00:00
patacongo	3aaad0504c	fix pipe cleanup logic git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@786 42af7a65-404d-4744-a932-0658087f49c3	2008-07-27 14:58:36 +00:00
patacongo	7a555278f0	Fix counting error git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@785 42af7a65-404d-4744-a932-0658087f49c3	2008-07-26 20:47:39 +00:00
patacongo	33e6d3e45d	Fix FIFO interlock errors git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@784 42af7a65-404d-4744-a932-0658087f49c3	2008-07-26 20:40:49 +00:00
patacongo	e2f289a52c	typo git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@783 42af7a65-404d-4744-a932-0658087f49c3	2008-07-26 15:12:31 +00:00
patacongo	4bd085848c	Pipe/FIFO info git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@782 42af7a65-404d-4744-a932-0658087f49c3	2008-07-26 15:09:21 +00:00
patacongo	28db0e083a	O_RDONLY open on FIFO blocks until writer opens git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@781 42af7a65-404d-4744-a932-0658087f49c3	2008-07-26 14:24:17 +00:00
patacongo	759ba256e8	Minor pipe updates git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@780 42af7a65-404d-4744-a932-0658087f49c3	2008-07-26 14:02:46 +00:00
patacongo	b918dac0c3	Add pipe() git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@779 42af7a65-404d-4744-a932-0658087f49c3	2008-07-26 13:12:11 +00:00
patacongo	048d0bd45e	update git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@778 42af7a65-404d-4744-a932-0658087f49c3	2008-07-22 10:58:30 +00:00
patacongo	2296bfca96	Add support for O_NONBLOCK git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@777 42af7a65-404d-4744-a932-0658087f49c3	2008-07-22 10:58:07 +00:00
patacongo	6b0ef9f1cc	* empty log message * git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@776 42af7a65-404d-4744-a932-0658087f49c3	2008-07-22 00:59:09 +00:00
patacongo	106f18b460	Pipe test git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@775 42af7a65-404d-4744-a932-0658087f49c3	2008-07-22 00:54:03 +00:00
patacongo	0b22d6a034	Debugging FIFO logic git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@774 42af7a65-404d-4744-a932-0658087f49c3	2008-07-22 00:52:07 +00:00
patacongo	d05f4750cb	Add mkfifo() git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@773 42af7a65-404d-4744-a932-0658087f49c3	2008-07-20 20:58:32 +00:00
patacongo	de003eb9d6	Remove pthread_mutexattrverifytype.c git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@772 42af7a65-404d-4744-a932-0658087f49c3	2008-06-05 02:07:51 +00:00
patacongo	c6839b479b	Add recursive mutex test git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@771 42af7a65-404d-4744-a932-0658087f49c3	2008-06-05 01:58:08 +00:00
patacongo	1f1e6f30a3	Fix recursive mutex bug git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@770 42af7a65-404d-4744-a932-0658087f49c3	2008-06-05 01:57:49 +00:00
patacongo	e14188b4a1	Add comments git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@769 42af7a65-404d-4744-a932-0658087f49c3	2008-06-03 10:25:00 +00:00
patacongo	9ccfde456f	Put timer_release in a separate file git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@768 42af7a65-404d-4744-a932-0658087f49c3	2008-06-03 01:31:13 +00:00
patacongo	d9112fa8b1	Improved timer life control fix git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@767 42af7a65-404d-4744-a932-0658087f49c3	2008-06-03 01:21:12 +00:00
patacongo	46c160af8b	Lower case file names git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@766 42af7a65-404d-4744-a932-0658087f49c3	2008-06-01 22:02:47 +00:00
patacongo	714c61c361	Add RAM disk support git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@765 42af7a65-404d-4744-a932-0658087f49c3	2008-06-01 20:08:20 +00:00
patacongo	15926d2f9e	sim mount example git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@764 42af7a65-404d-4744-a932-0658087f49c3	2008-06-01 19:35:55 +00:00
patacongo	e8339c2aba	examples/ostest can be executed in a loop git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@763 42af7a65-404d-4744-a932-0658087f49c3	2008-06-01 17:50:07 +00:00
patacongo	a9b64a7469	Fix problem when timer deleted by timer handler git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@762 42af7a65-404d-4744-a932-0658087f49c3	2008-06-01 17:46:26 +00:00
patacongo	b5d6002463	Condition on optimization backward git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@761 42af7a65-404d-4744-a932-0658087f49c3	2008-06-01 15:29:10 +00:00
patacongo	397ac05b87	Fix dependency git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@760 42af7a65-404d-4744-a932-0658087f49c3	2008-06-01 13:27:17 +00:00
patacongo	7b52111997	Sim target no longer uses Linux syscalls; works with Cygwin git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@759 42af7a65-404d-4744-a932-0658087f49c3	2008-06-01 13:18:51 +00:00
patacongo	bdf74c42f2	Fix several problems with accessing FAT filesystems git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@758 42af7a65-404d-4744-a932-0658087f49c3	2008-05-31 22:10:21 +00:00
patacongo	be2a62af5a	Eliminate deadlock condition in opendir() git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@757 42af7a65-404d-4744-a932-0658087f49c3	2008-05-31 20:14:15 +00:00
patacongo	ae5cc87281	Fix memory leak: Contained watchdog not being deleted with POSIX timer deleted git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@756 42af7a65-404d-4744-a932-0658087f49c3	2008-05-31 18:33:44 +00:00
patacongo	9a18c880a1	Comments updated git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@755 42af7a65-404d-4744-a932-0658087f49c3	2008-05-31 18:14:02 +00:00
patacongo	62d058a834	Comment updates git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@754 42af7a65-404d-4744-a932-0658087f49c3	2008-05-31 18:02:49 +00:00
patacongo	b08da21f90	Add support for recursive mutexes git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@753 42af7a65-404d-4744-a932-0658087f49c3	2008-05-31 17:13:08 +00:00
patacongo	7bbfd7880d	Add bug for watchdog leak. git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@752 42af7a65-404d-4744-a932-0658087f49c3	2008-05-18 01:01:40 +00:00
patacongo	07475ddcaf	Prepare for 0.9.10 release git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@751 42af7a65-404d-4744-a932-0658087f49c3	2008-05-15 10:51:14 +00:00
patacongo	4daf380c0c	Fix important task shutdown bugs git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@750 42af7a65-404d-4744-a932-0658087f49c3	2008-05-15 10:50:29 +00:00
patacongo	52ca776537	Document compiler error git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@749 42af7a65-404d-4744-a932-0658087f49c3	2008-03-24 23:54:58 +00:00
patacongo	c93316bf89	Fix access to ez80 I/O address space git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@748 42af7a65-404d-4744-a932-0658087f49c3	2008-03-23 21:22:19 +00:00
patacongo	ab876969dd	Implement irqsave/restore git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@747 42af7a65-404d-4744-a932-0658087f49c3	2008-03-23 17:58:08 +00:00
patacongo	536a458525	First clean ez80 compile & link git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@746 42af7a65-404d-4744-a932-0658087f49c3	2008-03-23 16:05:22 +00:00
patacongo	7caf0ae3b6	Add low UART init logic git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@745 42af7a65-404d-4744-a932-0658087f49c3	2008-03-23 14:50:18 +00:00
patacongo	0125c5989f	Add timer logic git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@744 42af7a65-404d-4744-a932-0658087f49c3	2008-03-23 14:11:49 +00:00
patacongo	ec531944df	Add timer definitions git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@743 42af7a65-404d-4744-a932-0658087f49c3	2008-03-23 13:16:11 +00:00
patacongo	5b5b6af723	Do not call open/close_peripheraldevice. That ties in too closely to ZiLOG's psuedo-OS git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@742 42af7a65-404d-4744-a932-0658087f49c3	2008-03-22 22:37:46 +00:00
patacongo	cc67653244	Need more flexibility in defining the heap region git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@741 42af7a65-404d-4744-a932-0658087f49c3	2008-03-22 22:37:04 +00:00
patacongo	8b84d88550	First cat at ez80 serial logic git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@740 42af7a65-404d-4744-a932-0658087f49c3	2008-03-22 21:19:29 +00:00
patacongo	7984beaa4b	More ez80 files compile git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@739 42af7a65-404d-4744-a932-0658087f49c3	2008-03-18 01:40:12 +00:00
patacongo	976ff7a822	Added EZ80 files git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@738 42af7a65-404d-4744-a932-0658087f49c3	2008-03-16 23:36:25 +00:00
patacongo	6cf70e0e2a	Fix compile error git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@737 42af7a65-404d-4744-a932-0658087f49c3	2008-03-16 21:08:24 +00:00
patacongo	71105edc9f	First cut at ez80 boot logic git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@736 42af7a65-404d-4744-a932-0658087f49c3	2008-03-16 00:06:05 +00:00
patacongo	7b5c4e515b	Add ez80f0910200kitg configuration git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@735 42af7a65-404d-4744-a932-0658087f49c3	2008-03-15 20:04:06 +00:00
patacongo	8d31154e34	Add ez80f910200kitg configuration git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@734 42af7a65-404d-4744-a932-0658087f49c3	2008-03-15 20:00:23 +00:00
patacongo	bb2a525bac	Fix z8f6423 link error git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@733 42af7a65-404d-4744-a932-0658087f49c3	2008-03-11 00:36:08 +00:00
patacongo	990820d579	Fixed of Z8F6423 -- still doesn't like correctly git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@732 42af7a65-404d-4744-a932-0658087f49c3	2008-03-10 23:37:56 +00:00
patacongo	12dea795b3	Add configuration for z8f64200100kit boar git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@731 42af7a65-404d-4744-a932-0658087f49c3	2008-03-10 23:15:47 +00:00
patacongo	460aa35bb4	Adding ez80 support git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@730 42af7a65-404d-4744-a932-0658087f49c3	2008-03-09 19:59:46 +00:00
patacongo	b1234a6bda	EZ80 support git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@729 42af7a65-404d-4744-a932-0658087f49c3	2008-03-09 19:56:37 +00:00