nuttx-0.1.0
^^^^^^^^^^^

This is the initial.  This initial includes the complete NuttX RTOS
with support for the Linux user mode simulation and the TI TMS320C5471
(Arm7) processor.  Partial support for the 87C52 is included.

This release has been verified on both the Linux user-mode and C5471
platforms using the test program under examples/ostest.  Test results
for the C5471 can be found in arch/c5471/doc/test-results.txt.

This tarball contains a complete CVS snapshot from March 9,2007.

nuttx-0.1.1
^^^^^^^^^^^

This is the second release of NuttX.  This release includes the following.
See the ChangeLog for more detailed description of the changes.

(1) General OS bugfixes (see the ChangeLog for details),
(2) bugfixes for the TI TMS320C5471 (Arm7) platform (see
    the ChangeLog)
(3) Complete support for the 87C52. (However, the 87C52
    release is not stable enough for general usage).
(4) Added the beginning of a shell call NuttShell (nsh)

This release has been verified on the Linux user-mode platform, the
Spectrum Digital TMS320C5471 EVM, and the PJRC 87C52 development board
using the test program under examples/ostest.

STATUS: The development status remains as ALPHA until further testing
is performed.

This tarball contains a complete CVS snapshot from March 14, 2007.

nuttx-0.1.2
^^^^^^^^^^^

This is the third release of NuttX.  This release is
primarily a bugfix release with minimal new features.  See
the ChangeLog for a more detailed description of the 
changes.

(1) Several important OS and ARM7 bugfixes,
(2) opendir(), closedir(), readdir(), etc. added
(3) Added C5471 watchdog timer.
(4) Created a shareable, serial driver.
(5) Added 'ls' command to NuttShell (nsh)
(6) Added a test of the round robin scheduler

This release has been verified on the Linux user-mode 
platform, the  Spectrum Digital TMS320C5471 EVM using the
test program under examples/ostest.

This tarball contains a CVS snapshot from March 19, 2007.

nuttx-0.2.1
^^^^^^^^^^^

This is the fourth relese of NuttX.  This release adds adds
support for a new platform, restructures many header files,
and adds a few new features:

(1) Support for Neuros OSD / DM320
(2) Restructuring of header files for better POSIX compliance
(3) Added kill()
(4) Added POSIX timers
(5) bugfixes and documentation updates

This release has been verified on the Linux user-mode 
platform, the  Spectrum Digital TMS320C5471 EVM, and the 
Neuros OSD  using the test program under examples/ostest.  Because
of the stability of these tests, the project status
has been upgraded to 'beta.'

This tarball contains a complete CVS snapshot from March 22, 2007.

nuttx-0.2.2
^^^^^^^^^^^^

This is the fifth release of NuttX.  There is no major new
functionality in this release.  This release adds support
for new pthread barrier APIs, changes the directory
structure, to better handle different board configurations
using the same processor architecture, and corrects a few
defects.

See the ChangeLog for a complete list of changes.

This release has been verified on the Linux user-mode
platform and the Neuros OSD using the test program under
examples/ostest.  There are no known, critical defects but
the project development status remains at 'beta' status
pending further test and evaluation.

This tarball contains a complete CVS snapshot from
March 26, 2007.

nuttx-0.2.3
^^^^^^^^^^^^

This is the sixth release of NuttX.  This release is
primarily a bugfix release.  Numerous problems were fixed
as detailedin the change log.  New functionality includes
support for timed message queues.

See the ChangeLog for a complete list of changes.

This release has been verified on the Linux user-mode 
platform and the Neuros OSD using the test program under
examples/ostest. The results of the testing is available in
the source tree under configs/ntosd-dm320/doc/test-results.
There are no known, critical defects but the project
development status remains at 'beta' status pending further
test and evaluation.

This tarball contains a complete CVS snapshot from March 29,
2007.

nuttx-0.2.4
^^^^^^^^^^^^

This is the 7th release of NuttX.  This release is only to roll out
build changes to better support different SoC's that use the same
processor architecture.  In particular, the two existing ARM architectures,
c5471 and DM320 were combined into a single ARM directory.  This was done
in preparation for an LPC2148 port that is currently in progress.  There
is NO new functionality or significant bufixes in this release.

See the ChangeLog for a complete list of changes.

This release has been verified on the Linux user-mode platform
and the Neuros OSD using the test program under examples/ostest.
The results of the testing is available in the source tree under
configs/ntosd-dm320/doc/test-results and under configs/sim/doc/test-results.
There are no known, critical defects but the project development status
remains at 'beta' status pending further test and evaluation.

This tarball contains a complete CVS snapshot from April 28, 2007.

nuttx-0.2.5
^^^^^^^^^^^^

This is the 8th release of NuttX.  This release includes:

(1) Several bug fixes
(2) Initial support for FAT filesystems.  Testing has not
    been exhaustive and some functionality is missing
   (mkdir, stat, unlink chmod, and rename functionality is 
    not yet implemented).
(3) Support for the NXP lpc2148 processor is included but
    is untested as of this writing.  The current 
    implementation includes only support for serial console
    and timer interrupt.

See the ChangeLog for a complete list of changes.

This release has been verified only on the Linux user-mode
platform.

This tarball contains a complete CVS snapshot from May 19,
2007.

nuttx-0.2.6
^^^^^^^^^^^

This is the 9th release of NuttX.  This is primarily a
bugfix release to correct a number of problems introduced
with the 0.2.5 release. This release does include some FAT
filesystem extensions including unlink(), mkdir(), rmdir(),
rename(), opendir(), closedir(), readdir(), seekdir(),
telldir(), rewindir().  There are some pending FAT changes
that did not make it into this release including stat(),
truncate(), and long file names.

See the ChangeLog for a complete list of changes.

This release has been verified only on the Linux user-mode
platform.

This tarball contains a complete CVS snapshot from May 26,
2007.

nuttx-0.2.7
^^^^^^^^^^^

This is the 10th release of NuttX.  This is primarily a bugfix releaseto correct a
number of problems reported to me (thanks Didier!). This release does include the
final changes complete the FAT filesystem logic including stat(), tatfs(), and non-
standard APIs to manage FAT
attributes.  At present,FAT long file names and file trunction() are still not
supported.

See the ChangeLog for a complete list of changes.

This release has been verified only on the Linux user-mode platform.

This tarball contains a complete CVS snapshot from June 9, 2007.

nuttx-0.2.8
^^^^^^^^^^^

This is the 11th release of NuttX.  This release (1) corrects important bugs
in opendir and realloc, (2) adds support for environment variables, (3) adds
several new C library interfaces, and (4) extends several example programs.

See the ChangeLog for a complete list of changes.

This release has been verified only on the Linux user-mode platform.

This tarball contains a complete CVS snapshot from July 2, 2007.

nuttx-0.3.0
^^^^^^^^^^^

This is the 12th release of NuttX.  This release includes the initial
integration of a network subsystem and the uIP TCP/IP stack into NuttX
(see http://www.sics.se/~adam/uip/index.php/Main_Page).  Also included
is a device driver for the Davicom DM90x0 Ethernet controller.

This integration is very preliminary.  Only a small portion of the
network functionality has been integrated and there are a number of
open issues (see the TODO file).  The network subsystem is pre-alpha
at this point in time.  I expect that it will stabilize and mature
over the next few releases.

The baseline functionality of NuttX continues to mature and remains at
post-beta (as long as the network is not used).

See the ChangeLog for a complete list of changes.

This release has been verified only on the Neuros OSD (DM320 ARM9)
platform using the DM90x0 driver.

This tarball contains a complete CVS snapshot from November 6, 2007.

nuttx-0.3.1
^^^^^^^^^^^

This is the 13th release of NuttX and the second release containing
the integration of a network subsystem and the uIP TCP/IP, UDP, and
ICMP stacks into NuttX (see http://www.sics.se/~adam/uip/index.php/Main_Page).

Many network-related problems have been fixed and the implementation
has matured significantly.  However, the level of network reliability
is probably still at the pre-alpha or early level.  It is sufficiently
complete that you may begin to perform some network integration and
is exepcted to achieve beta level of reliability over the next few
releases.

The baseline functionality of NuttX continues to mature and remains at
post-beta (as long as the network is not used).

See the ChangeLog for a complete list of changes.

This release has been verified only on the Neuros OSD (DM320 ARM9)
platform using the DM90x0 driver.

This tarball contains a complete CVS snapshot from November 19, 2007.

nuttx-0.3.2
^^^^^^^^^^^

This is the 14th release of NuttX and the 3rd release containing
the integration of a network subsystem and the uIP TCP/IP, UDP, and
ICMP stacks into NuttX (see http://www.sics.se/~adam/uip/index.php/Main_Page).

Many network-related problems have been fixed and the implementation
has matured significantly.  This release consists of:

o TCP-related bug-fixes
o TCP performance improvements
o Initial UDP integration
o Initial uIP micro webserver integration

See the ChangeLog for a complete list of changes.

The level of network reliability is at alpha level is expected to
achieve beta level of reliability over the next few releases.

The baseline functionality of NuttX continues to mature and remains at
post-beta.

This release has been verified only on the Neuros OSD (DM320 ARM9)
platform using the DM90x0 driver.

This tarball contains a complete CVS snapshot from November 23, 2007.

nuttx-0.3.3
^^^^^^^^^^^

This is the 15th release of NuttX and the 4th release containing
the integration of a network subsystem and the uIP TCP/IP, UDP, and
ICMP stacks into NuttX (see http://www.sics.se/~adam/uip/index.php/Main_Page).

Many network-related problems have been fixed and the implementation
has matured significantly.  This release consists of:

o TCP-related bug-fixes for disconnecting sockets
o Correction of some TCP read-ahead logic
o TCP performance improvements
o Misc. additions and cleanup (See the ChangeLog for a complete list of
  changes).

The level of network reliability is at an early beta release level.  The
baseline functionality of NuttX continues to mature and remains at
post-beta. Open network-related issues include only:

o Some minor unimplemented BSD socket functionality,
o Thread safety issues: the same socket cannot be used concurrently on
  different threads.
o Pending design changes necessary to support multiple network interfaces.
o IPv6 support is incomplete.

This release has been verified only on the Neuros OSD (DM320 ARM9)
platform using the DM90x0 driver. Any feedback for improving the network
reliability/performance would be greatly appreciated.

This tarball contains a complete CVS snapshot from November 28, 2007.

nuttx-0.3.4
^^^^^^^^^^^

This is the 16th release of NuttX and the 5th release containing
the integration of a network subsystem and the uIP TCP/IP, UDP, and
ICMP stacks into NuttX (see http://www.sics.se/~adam/uip/index.php/Main_Page).

This release is primarily a bug-fix release.  New features include
only:

o TELNET front-end to NSH,
o DHCPC server functionality, and
o C5471 Ethernet driver.

Numerous network related problems were fixed related to DHCPC, UDP
input processing, UDP broadcast, send timeouts, and bad compilation when
uIP is compiled at high levels of optimization.

The level of network reliability is at a strong beta release level.  The
baseline functionality of NuttX continues to mature and remains at
post-beta or production level.

Parts of this release were verified only on the Neuros OSD (DM320 ARM9)
platform using the DM90x0 Ethernet driver and other parts on the Spectrum
Digital C5471 EVM using the C5471 Ethernet driver. Any feedback about bugs
or suggestions for improving the network reliability/performance would be
greatly appreciated.

This tarball contains a complete CVS snapshot from December 10, 2007.

nuttx-0.3.5
^^^^^^^^^^^

This is the 17th release of NuttX this release is primarily a bug-fix
release and intended to synchronize with the current CVS contents.  See
the ChangeLog for a detailed list of changes and fixes.

This release were verified only on the Spectrum Digital C5471 EVM using
the C5471 Ethernet driver. Any feedback about bugs or suggestions for
improvement would be greatly appreciated.

This tarball contains a complete CVS snapshot from December 18, 2007.

nuttx-0.3.6
^^^^^^^^^^^

This is the 18th release of NuttX.  This release contains on a few
changes.  The primary purpose of this release is to synchronize with
the release of the pascal-0.1.0 add-on package.

This release of NuttX includes the following changes:

* Fixes for use with SDCC compiler
* Added a simulated z80 target (arch/z80)
* Fix deadlock errors when using stdio but with no buffering
* Add support for the add-on Pascal P-Code interpreter (pcode/)
  (see the pascal-0.1.0 package)

This release were verified only on the simulated Z80 and and host
simulation targets.  As usual, any feedback about bugs or suggestions
for improvement would be greatly appreciated.

This tarball contains a complete CVS snapshot from January 6, 2007.

====

There was an error in the initial 0.3.6 release that prevented
a successful build unless the Pascal add-on was present.  The
tarball was patched to include the fix.  Make sure that you download
the nuttx-0.3.6.1.tar.gz version to avoid this problem.

nuttx-0.3.7
^^^^^^^^^^^

This is the 19th release of NuttX.  This release includes the
preliminary port of NuttX to the ZiLOG z16f 16-bit microcontroller.
This port was verified using the ZiLOG z16f2800100zcog Development
and the ZiLOG ZDS-II toolchain. See http://www.zilog.com for
further information.

I emphasize that this is a preliminary release of the z16f port and
is only alpha or, perhaps, pre-alpha quality as of this writing.
There are a list of known issues in the TODO file in the root of
the NuttX directory.  The overall quality of NuttX (excluding the
z16f port) continues to improve beyond the late beta level.

The z16f port required numerous changes to NuttX to handle:

* NEAR and FAR addressing, and
* Use of a Windows native toolchain in a Cygwin build environment.

In addition to the z16f port, at least one very critical bug was
found and corrected in NuttX:  The thread-specific errno value of one
task was being randomly trashed when a different thread exitted.

This release were verified on the ZiLOG z16f2800100zcog, Neuros OSD
(ARM9), and the simulation platforms.  As usual, any feedback about bugs
or suggestions for improvement would be greatly appreciated.

This tarball contains a complete CVS snapshot from January 31, 2008.

nuttx-0.3.8
^^^^^^^^^^^

This is the 20th release of NuttX.  This is a minor bugfix release.
It corrects a few minor problems, adds a few minor features, and
continues the integration of the ZiLOG Z18F and of the Pascal P-Code
add-on.  This release is synchronized with the release of Pascal-0.1.2.

This tarball contains a complete CVS snapshot from February 10, 2008.

nuttx-0.3.9
^^^^^^^^^^^

This is the 21st release of NuttX.  This is a minor future enhancement
release.  This release includes support for the ZiLOG Z8Encore! micro-
controller.  Also included is the initial framework for support for
the Z80, XTRS platform (http://www.tim-mann.org/xtrs.html).

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 June 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.

nuttx-0.3.13
^^^^^^^^^^^^

This is the 25th release of NuttX.  This release includes some important bugfixes as well
as a few new features.  Bugs fixed include:

* Fixed problems with Cygwin-based console input.  NSH now works with the Cygwin simulator.
* sched_get_priority_max/min returned error on SCHED_RR
* Corrected detection of End-of-File in fgets()
* Fixed an error in opendir() that could cause an assertion to fail inappropriately.
* Corrected an error in the FAT that caused files opened for writing with O_APPEND to fail.
* Fix error in getopt() when called with argc==1
* Fix error in stat() when used on the root directory
* Fixed a critical bug that effects the way that environment variables are shared amongst
  pthreads.
* uIP port now supports multi-threaded, concurrent socket access.  So, for example, one
  thread can be reading from a socket while another is writing to the socket.

New features were also added:

* New OS APIs: chdir() and getcwd()
* The Nuttx shell (NSH) has been extended in many ways.
  - New commands: mkfatfs, mkfifo, sleep, usleep, nice, sh, cd, and pwd commands
  - New memory inspection commands and heap usage commands
  - New capabilities: Execution of commands in background, execution of simple scripts,
    redirection of command output, last command status ($?)
  - Now supports if-then[-else]-fi construct
  - and other features as noted in the ChangeLog.

These changes were verified only on the Host simulator under Cygwin and under Linux and
also on the Neuros OSD (ARM9).  Please report any errors to me.

This tarball contains a complete CVS snapshot from September 1, 2008.

nutt-0.3.14
^^^^^^^^^^^

This is the 26th release of NuttX.  This release includes some important bugfixes as well
as a few new features.  Critical bugs fixed include:

  FAT FS:
  * Fixed several critical bugs with regard to fat reading and writing and FAT12
    accesses.  Basically the FAT FS only worked with my tiny test files and test
    cases.  A lot of stronger FAT tested is still needed!!
  * Fixed another FAT bug in implementation of FAT lseek; this prohibit correct
    random access to large files.

  Network:
  * Corrected a critical bug that may prevent recvfrom from receiving packets from
    most remote UDP port numbers.
  * Corrected an error in multi-threaded socket handling in send() and sendto().
    Outgoing data could overwrite incoming data.
  * Corrected IP checksum calculation in ICMP and UDP message send logic.
  * Corrected an error in send() timeout logic.

New features were also added:

  Network:
  * Added support for application access to ICMP protocol stacks; Added
    ping request logic (net/uip).
  * Added basic TFTP client logic (netutils/tftpc).

  NuttShell (NSH):
  * New commands: 'test', '[', 'ping', 'mkrd', 'xd', andTFTP 'get' and 'put'
    commands (See the new NuttShell User Guide for additional information).

Other less critical bugs were also fixed and other less important features were
were added (See the ChangeLog for details).

These changes were verified only on the Neuros OSD (ARM9).  Please report any errors to me.

This tarball contains a complete CVS snapshot from September 8, 2008.

nutt-0.3.15
^^^^^^^^^^^

This is the 27th release of NuttX.  This release includes some new features:

  * Adds support for the ROMFS filesystem
  * ROMFS supports mmap() to provide eXecute In Place (XIP) capability
  * NuttShell (NSH) can be configured to use ROMFS to provide a tiny read-only
    filesystem with a startup script in /etc.
  * Completed the basic port of the NXP LPC2148 on the mcu123.com board.
    The basic port includes successful booting, timer interrupts, serial console,
    succesfully passing the examples/ostest, and a NuttShell (NSH) configuration.

These changes were verified only on the mcu123.com NXP LPC2148 board.  Please report
any errors to me.

This tarball contains a complete CVS snapshot from September 20, 2008.

nutt-0.3.16
^^^^^^^^^^^

This is the 28th release of NuttX.  This release includes the first support for
USB in NuttX.  A set of USB APIs were added to support USB device controller
drivers and bindings to USB device class drivers.  The form of the interface
was inspired by the Linux Gadget APIs.

At present USB device controller drivers are included for:

  * The NXP LPC214x.  This driver has been verified and is an early alpha
    stage in quality.
  * TI DM320.  Coding for this driver is complete but it is completely untested
    as of this release.

A controller-independent class driver is also included for:

  * USB serial class device driver (emulates the Prolific PL2303 serial-to-USB
    adaptor).  This drver has only been verified with the Linux host PL2303
    driver.

Other new features include:

  * Add an option to set aside a separate stack for interrupt handling (ARM only).
    This is useful when memory is constrained, there are multiple tasks, and
    the interrupt stack requirement is high (as when USB is enabled).

A few bugs were also fixed:

  * Fixed the frequency of system timer interrupts in the NXP LPC214x port
    (off by 20x in nuttx-0.3.15)
  * Fixed serial driver bugs related to (1) open counts and (2) recognizing
    O_NONBLOCK on read.
  * Fixed an error in read(); it was not setting the errno on errors returned
    from the driver.

These changes were verified only on the mcu123.com NXP LPC2148 board using with
a Linux host.  Please report any errors to me.

This tarball contains a complete CVS snapshot from Octobor 10, 2008.

UPDATE
^^^^^^
This release does not build for the ARM target when USB is disabled.  Here is the fix:

Index: arch/arm/src/common/up_internal.h
===================================================================
RCS file: /cvsroot/nuttx/nuttx/arch/arm/src/common/up_internal.h,v
retrieving revision 1.13
diff -u -r1.13 up_internal.h
--- arch/arm/src/common/up_internal.h   6 Oct 2008 16:20:52 -0000       1.13
+++ arch/arm/src/common/up_internal.h   13 Oct 2008 20:48:21 -0000
@@ -200,7 +200,8 @@
 extern void up_usbinitialize(void);
 extern void up_usbuninitialize(void);
 #else
-# define up_netinitialize()
+# define up_usbinitialize()
+# define up_usbuninitialize()
 #endif

 #endif /* __ASSEMBLY__ */

nuttx-0.3.17
^^^^^^^^^^^^

This is the 29th release of NuttX.  This release includes the additional support for
USB in NuttX.  The following new features were added:

  * Added support for SPI-based MMC/SD cards (with an SPI driver for the NXP LPC214x).
  * Added USB storage class device side driver (BBB)
  * Added an example that demonstrates the USB storage class by exporting the SPI
    based MMC/SD card on the NXP LPC214x.

This is an early alpha release of these drivers.  At present they only work with
debug features enabled so there are probably some race conditions that occur only
with debug features disabled (anyone out there with a USB analyzer?  I would love
to know what is happening).

Several important bugs were also fixed in the FAT file system, USB serial driver and
NXP LPC214x USB controller driver (see the ChangeLog for details).

These changes were verified only on the mcu123.com NXP LPC2148 board using a Linux
development environment.  USB testing was performed using both a Linux host and a WinXP
host.  Please report any errors to me.

This tarball contains a complete CVS snapshot from Octobor 28, 2008.

nuttx-0.3.18
^^^^^^^^^^^^

This is the 30th release of NuttX.  This release includes two partially completed
ports, several new features, and a couple of important bug fixes.  The two partially
completed ports are:

    * The STMicro STR71x processor and configuration for the Olimex STR-P711
      board.
    * The Hitachi SH-1 using the SH1_LCEVB1 (SH-1/US7032EVB1) board

Progress on these ports is stalled (as detailed in the ChangeLog).

The new features focus primarily on management of block devices and extensions of
the NuttShell (NSH).  These include:

    * A loop device that converts a file into a block device.
    * A block to character (BCH) driver that  allow access a block device as
      if it were character device.
    * Added strcasecmp() and strncasecmp() libc functions.
    * Added the 'dd' and 'losetup' commands to NSH. These commands (along
      with mkfatfs and mount), give good managment of filesystems on the target.

Several bugs were fixed, the most important of which are:

    * Fixed a race condition workaround delay in LPC214X SPI logic.  This was also
      the cause of some bad MMC/SD performance on that platform.
    * Fixed a recently introduced FAT file system problem: It would mount a (invalid)
      FAT file system even if the medium is not formatted!
    * Corrected two iother important errors in the FAT lseek implementation:
      (1) the sectors-per-cluster value was being reset to "1" and (2) important
      lseek logic was omitted when the seek position was zero.

The FAT filesystem has had many bugs fixed in it and, I think, is now maturing
and becoming stable.

These changes were verified only on the mcu123.com NXP LPC2148 board, the Hitachi
SH1_LCEVB1 board, and the Linux simulator, all using a Linux development environment.
Please report any errors to me.

This tarball contains a complete CVS snapshot from November 16, 2008.

nuttx-0.3.19
^^^^^^^^^^^^

This is the 31st release of NuttX.  This release includes the following new feature:

    * Add poll() and select() APIs that may be used to monitor for data
      availability on character devices or TCP/IP sockets.
    * Implemented support TCP/IP connection backlog.  This allows select to wake-up
      on new connections to a listener socket.
    * Added definition of a framebuffer driver and implement framebuffer drivers
      for the simulated platform and the TI DM320 (untested as of the inital check-in).
    * Partially developed a graphics framework based on the framebuffer drivers,
      however, this will not be ready for use for a few more release.  Currently
      this includes only a few color conversion routines and some rasteizing functions.
      A tiny windowing system is under development but not ready for check-in yet.
    * Added support for fixed precision math.
    * Added support for outgoing multicast packets.

Several bugs were fixed, the most important of which are:

    * Fixed an important bug in the TCP/IP buffering logic.  When TCP/IP read-ahead is enabled
      and not recv() is in-place when a TCP/IP packet is received, the packet is placed into
      a read-ahead buffer.  However, the old contents of the read-ahead buffer were not being
      cleared and old data would contaminate the newly received buffer.
    * Changed the behavior of the serial driver read.  It now returns data as it
      is available rather than waiting for the full requested read size.  This
      makes functions like fgetc() work much more smoothly.

These changes were verified only on the Neuros OSD (ARM9) using a Linux development
environment. Please report any errors to me.

This tarball contains a complete CVS snapshot from November 26, 2008.

nuttx-0.4.0
^^^^^^^^^^^

This is the 32nd release of NuttX.  This release adds graphics support and a tiny
windowing subsystem.  That new graphics subystem is documented at
http://nuttx.sourceforge.net/NXGraphicsSubsystem.html.  No other substantial changes
were made.

These changes were verified only on the NuttX simulation platform with X11 windows
simulating a device framebuffer. Please report any errors to me.

The version number was bumped up to 0.4.0 in part to reflect the new graphics subsystem,
but also to recognize the NuttX is approaching complete functionality.  In the 0.3.x
versions, network support was added, Pascal P-code runtime support was added, FAT and
ROMFS filesystems were added, MMC/SD and USB device support were added.  There were
also numerous extensions to the NuttShell, NuttX APIs, and architecture ports.

This tarball contains a complete CVS snapshot from December 6, 2008.

nuttx-0.4.1
^^^^^^^^^^^

This is the 33rd release of NuttX.  This is a minor bugfix release.  The primary reason
for this release is to correct numerous build errors that have accumulated for the ZiLOG
ZDS-II based targets.  All ZDS-II targets now build correctly (but have not been re-tested).
In addition to platform-specific build failures,  release also adds the following features
which were not tested as of the time of the release:

    * Board support fot the ZiLog ez80Acclaim! ez80f910200zco Development Kit
    * ZiLOG eZ80F91 EMAC driver

These changes were verified only on the NuttX simulation platform. Please report any errors
to me.

This tarball contains a complete CVS snapshot from Februrary 6, 2009.

nuttx-0.4.2
^^^^^^^^^^^

This is the 34th release of NuttX.  This release adds no new OS features but does include
support for two new architectures:

    * ez80Acclaim!  Basic support has been integrated and verified for the ez80f910200zcog-d
      board (eZ80F91-based).  That basic support includes timer interrupts and serial
      console.  Ongoing work includes an EMAC driver that should be integrated for
      the next release nuttx-0.4.2.

      eZ80Acclaim! support has been in the code base for some time, but has only just
      been integrated due to toolchain issues.

    * Renesas M16C/20.  Support for the Renesas SKP16C20 board has been included in
      the NuttX source tree.  However, as the eZ80Acclaim!, testing and integration
      of that port is stalled due to toolchain issues.

These changes were verified only on the ZiLOG eZ80910200zcog-d board. Please report any errors
to me.

This tarball contains a complete CVS snapshot from Februrary 28, 2009.

nuttx-0.4.3
^^^^^^^^^^^

This is the 35th release of NuttX.  This release one important new OS feature and corrects
and extends the eZ80 port:

    * Priority Inheritance.  The basic NuttX waiting logic was extended to
      support priority inheritance. See the NuttX User Manual for further
      information: http://www.nuttx.org/NuttxUserGuide.html#priorityinheritance.
    * ez80Acclaim! Corrected several critical, show-stopping bugs on that
      platform including: Errors in the serial driver intrrupts and an error
      in the eZ80 table,.
    * eZ80Acclaim!: Completed integration of the eZ80F91 EMAC driver.

These changes were verified only on the ZiLOG eZ80910200zcog-d board and on Cygwin-based
simulation platform in various configurations. Please report any errors to me.

This tarball contains a complete CVS snapshot from March 13, 2009.

nuttx-0.4.4
^^^^^^^^^^^

This is the 36th release of NuttX.  This release focuses on bugfixes and extending
and verifying certain networking features.

    * Important bugs were fixed in NSH, UDP checksum calculation, UDP bind()
      behavior for port==0, the eZ80Acclaim! EMAC driver, Z80 interrupt handling,
      and in the C libraries.
    * Testing was extended to further verify the tiny webserver, DHCPD, wget(),
      and sendmail.

See the Changelog for a detailed description of these changes.

These changes were verified only on the ZiLOG eZ80910200zcog-d board using the
ZDS-II toolchain in Cygwin-based environment. Please report any errors to me.

This tarball contains a complete CVS snapshot from March 29, 2009.

nuttx-0.4.5
^^^^^^^^^^^

This is the 37th release of NuttX.  This release focuses on a few new features.

    * The basic port for the FreeScale ARM920T i.MX1 processor on the
      Freescale MX1ADS board.  Coding is complete for this port, but it is
      has not yet fully integrated
    * Extended I2C and SPI interface definitions
    * Add basic support for C++ applications.  Very simple C++ applications
      can now be built against NuttX without any external libraries.  At
      present, only the most primitive C++ programs are supported, but it
      is hoped that this support will be extended in future releases.

See the Changelog for a detailed description of these changes.

This tarball contains a complete CVS snapshot from April 19, 2009.

nuttx-0.4.6
^^^^^^^^^^^

This is the 38th release of NuttX.  The release features support for the Micromint
Eagle-100 development board.  This board is based around, the Luminary LM3S6918 MCU.
This is the first ARM Cortex-M3 architecture supported by Nuttx. This initial, basic
port includes timer and serial console with configurations to execute the NuttX OS
test and to run the NuttShell (NSH). Work is still underway on this port and current
plans are to have I2C, SSI, MMC/SD, and and Ethernet driver in the 0.4.7 release.

Additional work was done on the MXADS i.MX1 port, however, that work has been set
aside until I complete work on the Eagle-100 (I also need to come up with a 3V power
supply).

Other changes in this release include: Extensions to the SPI interface definition
in order to handle 9-bit interfaces to displays.  Several bugs were fixed (see the
ChangeLog for a complete list of changes).

This tarball contains a complete CVS snapshot from May 19, 2009.

nuttx-0.4.7
^^^^^^^^^^^

This is the 39th release of NuttX.  This release focuses on cleaning up and
extending the Eagle100/LM3S6918 port released in nuttx-0.4.6 and on improved
MMC/SD support.  New features include:

  o Improved reliably and additional drivers for the Eagle-100 board (LM3S6918
    ARM Cortex-M3).  Additional drivers include Ethernet, SSI, and support for
    the on-board LEDs and microSD cards.
  o The SPI-based MMC/SD driver was extended to support SDHC Version 2.xx cards.

In addition, this release includes several important bugfixes for the LM3S6918,
the LPC2148, the SPI-based MMC/SD driver, and to FAT32.  See the ChangeLog for
details of these bugfixes.

This tarball contains a complete CVS snapshot from May 29, 2009.

nuttx-0.4.8
^^^^^^^^^^^

This is the 40th release of NuttX.  This release adds:

  o Support for the Olimex STRP711 board.  That board is based on the STMicro
    STR711 MCU (ARM7TDMI). Integration is complete on the basic port (boot logic,
    system time, serial console). Two configurations have been verified: (1) The
    board boots and passes the OS test with console output visible on UART0, and
    the NuttShell (NSH) is fully functional with interrupt driven serial console. 
    An SPI driver is available but untested (because the Olimex card slot appears
    to accept only MMC cards; I have only SD cards).  Additional needed: USB and
    driver, MMC integration.

  o Support for the CodeSourcery and devkitARM Windows-native GNU toolchains.
    Makefiles have been modified for the LM3S6918, LPC2148, and STR711 to support
    these toolchains under Cygwin.

This tarball contains a complete CVS snapshot from June 13, 2009.

nuttx-0.4.9
^^^^^^^^^^^

This is the 41st release of NuttX.  This release adds:

    * Support for a new binary format call NXFLAT that can be used to 
      execute separately linked programs in place in a file system.
      See http://www.nuttx.org/NuttXNxFlat.html.

    * Several important bugs were files related to networking and ROMFS
      (see the ChangeLog for a complete list).

This tarball contains a complete CVS snapshot from June 26, 2009.

nuttx-0.4.10
^^^^^^^^^^^

This is the 42nd release of NuttX.  This released focused on the port of Jeff
Poskanzer's THTTPD HTTP server (see http://acme.com/software/thttpd/.).  As of
the 0.4.10 release, that port is still not fully complete and functional.
However, numerous related bug-fixes and functional additions for THTTPD were
added:

    * Several new standard C-library functions (fileno, strstr, strpbrk, fcntl).
    * Improved and extended timing APIs (mktime, gmtime, gmtime_r, gettimeofday,
      localtime, localtime_r, and strftime)
    * Networking enhancements: recvfrom and accept now work with non-blocking
      sockets.
    * NXFLAT extensions (exec)
    * Pattern matching logic.
    * And miscellaneous bug fixes (see the ChangeLog for details).

This tarball contains a complete CVS snapshot from August 8, 2009.

nuttx-0.4.11
^^^^^^^^^^^^

This is the 43rd release of NuttX. This release of NuttX incorporates the
verified port of Jeff Poskanzer's THTTPD HTTP server (see http://acme.com/software/thttpd/.).
Many of the key features of THTTPD have been tested on the Micromint Eagle-100
development board (Cortex-M3).  These tests verify:

    * Serving of files from any file system
    * Execution of CGI executable.  This release supports execution of
      NXFLAT executables on a ROMFS file system (http://www.nuttx.org/NuttXNxFlat.html)

A standard CGI interface is used:  Information is pasted to the CGI program via POST
commands and via environment variables.  CGI socket I/O is redirected to stdin and stdout
so that the CGI program only need to printf() to send its content back to the HTTP
client.

Another value to this THTTPD integration effort has been that THTTPD has provided a very
good test bed for finding NuttX networking bugs.  Several very critical networking bugs
have been fixed with this 0.4.11 release (see the ChangeLog for details).  Networking
throughput has also been greatly improved.  Anyone using NuttX networking should consider
upgrading to this release.

This tarball contains a complete CVS snapshot from September 16, 2009

nuttx-0.4.12
^^^^^^^^^^^^

This is the 44th release of NuttX.  This release adds basic support for the STMicro STM32,
Cortex-M3 MCU.  The specific port is to the STMicro STM3210E-EVAL development board based
around the STM32F103ZET6 MCU.  Some highlights of this port:

    * This basic port includes boot-up logic, interrupt driven serial console, and system
      timer interrupts.
    * Includes a basic STMicro RIDE7 project that can be used to perform basic STM32
      board bring-up (due to RIDE7 size limitations, it cannot be used for the full NuttX
      bring-up).
    * Working, Tested Configurations:  the NuttX OS test and the NuttShell (NSH) example.

This basic STM32 port will be extended in the 0.4.13 NuttX release.  Functionality needed
for complete STM32 support includes:  USB device driver, LCD driver and NX bringup on the
development board's display and MicroSD support.  An SPI driver and a DMA support was included
in this 0.4.12 release, but is not yet tested.

This tarball contains a complete CVS snapshot from October 17, 2009

nuttx-0.4.13
^^^^^^^^^^^^

This is the 45th release of NuttX.  The release extends the support for the STMicro
STM32 microcontroller.  Minimal support for the STM3210E-EVAL development board based
around the STM32F103ZET6 MCU was released in NuttX-0.4.12.  This release adds:

    * A simple interface definition to support some FLASH, EEPROM, NVRAM, etc. devices.
    * Verified SPI operation using driver for SPI based FLASH parts M25P64 and M25P128.
    * Improved Cortex-M3 context switching.  This should improve context switching
      performance be 2x in certain cases.
    * Added a USB device-side driver for the STM32.  This is an early release of a
      very complex driver; some bugs are expected.  
    * The USB driver has been verified against the USB serial device class driver.
      There is at least one known outstanding issue (see the full bug description in
      the TODO list).

This release also corrects some important bugs in the early STM32 release:

    * Fixed several errors the prevented operation of NuttX on an STM32 development
      board using USART2 as the serial console.
    * Fixed and optimization-dependent race condition in the clock initialization.
    * Fixed a critical bug in the interrupt control logic that could cause interrupt
      operations to failed used for interrupts in a certain range.

This tarball contains a complete CVS snapshot from November 4, 2009

nuttx-4.14
^^^^^^^^^^

This is the 46th release of NuttX.  The release extends the support for the STMicro
STM32 microcontroller.  Minimal support for the STM3210E-EVAL development board based
around the STM32F103ZET6 MCU was released in NuttX-0.4.12 and extended in Nuttx-0.4.13
to include initial USB support.  This completes the STM32F103ZET6 and adds:

New Generic RTOS Features:

    * Added generic support that can be included in any block driver to provide
      read-ahead buffering and write buffering for improved driver performance.
    * Added a generic worker thread that can used to defer processing from an
      interrupt to a task.
    * Defined a generic SD/SDIO interface can can be bound to a MMC/SD or SDIO
      driver to orovide SDIO support.
    * Implemented a an SDIO-based MMC/SD driver using this new SDIO interface

New STM32 Features:

    * Add support to configure an STM32 input GPIO to generate an EXTI interrupt.
    * Added support for buttons on the STM3210E-EVAL board.
    * Implemented an STM32 version of the common the SDIO interface.
    * Added a configuration to exercise the STM32 with the USB mass storage
      device class example.

This release also corrects some important bugs in the early STM32 release:

    * Correct error handling in the mount() logic.
    * Fixed several STM32 DMA-related issues. Integrated and debugged STM32 DMA
      functionality that was added in 0.4.12.
    * Fixed several bugs in the STM32 USB device-side driver.

NOTE:  This version, 4.14, is equivalent to what would have been called 0.4.14
to follow 0.4.13.  The zero has been eliminated from the front of the version
number to avoid confusion about the state of development:  Some have interpreted
the leading zero to mean that the code is in some way unstable.  That was not
the intent.  Beginning in January 2010, I will switch to the 2010.nn versioning
as many others have done to avoid such confusion.

This tarball contains a complete CVS snapshot from December 2, 2009

nuttx-5.0
^^^^^^^^^

This is 47th release of NuttX and the successor to nuttx-4.14.  This
major revision number has been incremented to indicate that an
incompatibility with previous nuttx releases has been introduced.  This
version adopts standard fixed width integer names as specified by the
ANSII C99 standard.  The core logic of NuttX is older than that
standard and did not conform to it.

If you have applications running on nuttx-4.14, those applications
should continue to build and execute without problem on nuttx-5.0.
However, if you have device drivers or other OS-internal logic, you
will probably have to make some minor changes to your code to use
this version.  Below is a summary of those changes:

o If you include sys/types.h to get the non-standard, fixed width
  integer types (uint32, uint16, ubyte, etc.), that is no longer
  necessary.
o Instead, you will need to include stdint.h where the new fixed width
  integer types are defined (uint32_t, uint16_t, uint8_t, etc.).
o You will have to change all occurrences of the following types:

  uint32 -> uint32_t
  uint16 -> uint16_t
  ubyte  -> uint8_t
  uint8  -> uint8_t
  sint32 -> int32_t
  sint16 -> int16_t
  sint8  -> int8_t

o In addition, the non-standard type 'boolean' must replaced with the
  standard type 'bool'.  The type definition for 'bool' is in stdbool.h

This change in typing caused small changes to many, many files.  It was
verified that all configurations in the release still build correctly
(other than the SDCC-based configurations).  Regression testing was
performed on a few configurations, but it is possible that minor build
issues still exist (if you encounter any, please let me know and I will
help you to fix them).

In the course of the regression testing, several important bugs unrelated
to the type changes were found and corrected.

o Fixed an important error in the RX FIFO handling logic of the LM3S6918
  Ethernet driver.
o Corrected the handling of TCP sequence numbers in the TCP stack.
o And other less important bugs as detailed in the ChangeLog.

The primary focus of this release was standards compatibility, but a
few new features were added including a (1) Flash Translation Layer (FTL)
that will support filesystems on a FLASH device and (2) partial ports
for the STM32F107VC and HCS12 C9S12NE64 MCUs.  Those ports are very
incomplete as of this writing.

This tarball contains a complete CVS snapshot from December 21, 2009

nuttx-5.1
^^^^^^^^^

This is the 48th release of NuttX.  This release adds support for two new
MCU architectures in various states of development:

o AT91SAM3U (http://www.atmel.com/products/at91/sam3landing.asp?family_id=605)

  This release adds support for the SAM3U-EK development board with the
  AT91SAM3U4E MCU (http://www.atmel.com/dyn/products/product_card_mcu.asp?part_id=4562).
  As with most NuttX architecutre releases, the release will be rolled out in
  two parts:  A basic port and an extended port.

  NuttX-5.1 includes the basic port for the SAM3U-EK board.  This release
  passes the NuttX OS test and is proven to have a valid OS implementation.
  It supports the basic boot-up, serial console and timer interrupts.  A
  configuration to support the NuttShell is also included.

  The extended port will also include support for SDIO-based SD cards and
  USB device (and possible LCD support).  These extensions may or may not
  happen by the Nuttx 5.2 release as my plate is kind of full now.

o LPC3131 (http://ics.nxp.com/products/lpc3000/lpc313x.lpc314x.lpc315x/)

  This release also adds the complete implementation of the basic port for
  the NXP LPC3131 MCU on the Embedded Artists EA3131 board
  (http://www.embeddedartists.com/products/kits/lpc3131_kit.php).  That port,
  unfortunately has stalled due to tools issues.  Those tool issues have
  been resolved and I am confident that the verified basic port will be
  available in NuttX-5.2.

  The extended release will follow and should include SDIO-based SD card
  support and device USB.

A few additional features and bugfixes of a minor nature were also incorporated
as detailed in the ChangeLog.

nuttx-5.2
^^^^^^^^^

This is the 49th release of NuttX.  This release completes the verification of
the basic port for the NXP LPC3131 MCU on the Embedded Artists EA3131 board
(http://www.embeddedartists.com/products/kits/lpc3131_kit.php).  This basic
port includes basic boot-up, serial console, and timer interrupts.  This port
has been verified on the using the NuttX OS test and includes a working
implementation of the NuttShell (NSH).

An extended release will follow and should include SDIO-based SD card
support and device USB.

nuttx-5.3
^^^^^^^^^

This is the 50th release of NuttX.  This release suport for one new achitecture:

  * A basic port for the NXP LPC2378 MCU on the Olimex-LPC2378 development board
    was contributed by Rommel Marcelo.

And extensions to two existing architures:

  * David Hewson contributed a dual-speed (full/high) USB device-side driver
    for the NXP LPC3131 on the Embedded Artists EA3131 development board.
  * A DMA driver and a high speed MCI driver for the Atmel AT91SAM3U are
    included (but not fully tested in this release).

Two important bugfix was also included:

  * An important fix to the USB mass storage driver was contributed by
    David Hewson.
  * A serious error in the AT91SAM3U PIO handling was fixed.

nuttx-5.4
^^^^^^^^^

This is the 51st release of NuttX.  This release includes one new, important
extension to th NX graphics system (See http://www.nuttx.org/NXGraphicsSubsystem.html).

NX was develop a couple years back on hardware that supported only framebuffer
devices, that is, video hardware with video memory directly converts the memroy
content to video.  However, most MCUs that NuttX focuses on do not support such
video memory; rather, that typically only support LCDs via parallel or serial
interfaces.

This release of NuttX extends NX so that now renders directly to the LCD device
via its serial or parallel interface.  No in-memory copy of the screen memory
need be maintained so this solution should also work in MCUs with very limited
SRAM.

This initial release of this feature includes the verified NX extensions plus
a driver for the HX8347, 16-bit parallel LCD.  This LCD supports 16-bit RGB
(5:6:5).

nuttx-5.5
^^^^^^^^^

This is the 52nd release of NuttX.  This release includes one new port, some
new drivers and some important bugfixes:

  * NuttX was ported to the Luminary/TI LM3S6965 Ethernet Evaluation Kit.
    At present, that port includes an OS test configuration and a NuttShell
    (NSH) configuration with telnet support.

    MMC/SD and Networking support are provided but not thoroughly verified
    in this release: Current development efforts are focused on porting the
    NuttX window system (NX) to work with the Evaluation Kits OLED display.

  * A NuttX Ethernet driver for the Microchip ENC28J60 SPI Ethernet chip is
    available in the source tree (but has not yet been fully verified because
    I haven't properly connected it to hardware yet).

  * The Olimex STR-P711 NuttX port was extended to support the ENC28J60 and
    some new networking configurations were added.  The ENC28J60 has not
    been tested on the STR-P711, however, because of hardware issues (I don't
    think the USB powered board provides enough power for the ENC28J60 and
    I don't have the right wall wart yet).

    Along the way, external interrupt support (XTI) was added to the STMicro
    STR-P711 port and some important bugs were fixed in the STR-P711 SPI
    driver.

  * Added (optional) floating point support for printf() (contributed by
    Yolande Cates).

  * Corrected an important UDP reference counting error.  It was not a serious
    error, but it trigger an assertion was IS a serious error.

nuttx-5.6
^^^^^^^^^

This is the 53rd release of NuttX.  This release includes one several new drivers
for existing NuttX ports:

  * This port adds support for the RiT displays P14201 4-bpp, greyscale OLED.
    4-bpp greyscale support was integrated into the NX graphics sub-system and
    verified using the TI/Luminary LP3S6965 Ethernet Evaluation Kit.

  * The M25Px driver was extended for the M24P1 FLASH part (see NOTE).

  * An I2C driver and (basic) SPI driver were added for the NXP LPC313x port.
    The I2C interface definition was extended to efficiently handle multiple I2C
    transfers (See NOTE).

    NOTE: Contributed by David Hewson.

As well as a few, important USB-related bugfixes (See the ChangeLog for details).

This release also includes the beginnings of a port for the NXP LPC1768 MCU.  However,
it is too early for that port to be useful (stay tuned for a future announce of the
availability of the LPC1768 port).

nuttx-5.7
^^^^^^^^^

This is the 54th release of NuttX.  This release adds basic support for one new
ARM Cortex-M3 architecture:

  * Added support for NXP LPC1768 MCU as provided on the Nucleus 2G board from
    2G Engineering (http://www.2g-eng.com).
  * Some initial files for the LPC17xx family were released in NuttX 5.6, but the
    first functional release for the NXP LPC1768/Nucleus2G occured with NuttX 5.7.
  * That initial basic release included timer interrupts and a serial console and was
    verified using the NuttX OS test.
  * That release includes a verified NuttShell (NSH) configuration
    (see the http://www.nuttx.org/NuttShell.html).
  * Also included are unverified SPI and USB device drivers.

Further efforts include: (1) development of a DMA support library, (2) SPI-based MMC/SD
support, and (3) verification of the USB driver.  Watch for announcement of the completed
LPC1768 port expected in NuttX-5.8.

nuttx-5.8
^^^^^^^^^

This is the 55th release of NuttX.  This includes several important bugfixes:

  * Corrects some interrupt vectoring for the TI/Stellarix LM3S port
  * Correct initialization logic for NXP LPC17xxx NuttX ports:  Power was
    not being provided to the GPIO module!
  * Corrected (but did not verify) implementation of the optional interrupt
    stack feature (all Cortex M3 architectures).
  * Correct a HardFault in the LPC17xx SSP driver.

Additional minor fixes are also included as detailed in the ChangeLog.

Several new features have been fully developed and included in this release, but
full verification of most of these new features has been blocked for a variety
of issues:

  * Added microSD support for the NuttShell (NSH) configuration in the
    Nucleus2G LPC1768 port.  For reasons that have not yet been determined,
    I have not successfully accessed the microSD card as of this writing.
  * Two USB configurations were also added for the Nucleus2G board:  One to
    support the USB serial device and one for the USB mass storage device.
    Some testing of the USB driver was performed, but full verification is
    stalled for an OTG style USB cable.
  * LEDs now work correctly on the Nucleus2G LPC1768 board.
  * The NuttX/uIP networking subsystem now supports IGMPv2 client.  IGMP
    (Internet Group Multicast Protocol) network "appliances" to join into
    multicast groups.  Outbound traffic to enter and leave multicast groups
    has been verified, but full verification will require a switch capable of
    multicast.  Issues associated with the receipt of multicast packets are likely.

nuttx-5.9
^^^^^^^^^

This is the 56th release of NuttX.  This release is difficult to categorize;
NuttX-5.9 was really released because there were too many changes accumulating
in CVS -- a few important, some unfinished implementations, and a couple of
important bugfixes.

  * By far biggest change in this release is the complete implementation
    of on-demand paging support.  This feature will allow you to execute large
    programs on a mass storage device (such as SPI FLASH) in a small RAM.
    All of the core on-demand paging logic was completed (see
    http://www.nuttx.org/NuttXDemandPaging.html) and support was implemented
    for the ARM-9 family.  A test configuration is in place for the NXP
    LPC3131.  It has been verified that this new logic does not interfere
    with normal fixed-page ARM9 operation, but otherwise this new on-demand
    paging feature is untested.
  * Add support for the CodeSourcery toolchain to the Olimex-lpc2378 port
    and for the Neuros OSD port.
  * The Neuros OSD port has been updated to work with the production v1.0
    OSD (previously it only worked with the development board).
  * And some miscellaneous feature enhancements as detailed in the ChangeLog.

This includes several important bugfixes:

  * NXP LPC17xx - Fixed a critical bug in the GPIO configuratino logic:
    When attempting to set no pull-up or pull-down (floating), it would,
    instead, select pull-down.
  * TI/Luminary LM3Sxxxx - Fixed (1) a logic error in an address table
    lookup, (2) GPIO port encoding the limited support to only 8 GPIO
    ports.
  * Corrected the lease time in the DHCPC implementation:  It was not in
    host byte order.
  * And several other less important bugs as documented in the ChangeLog:
    Warnings, cornercase compilation problems, etc.

nuttx-5.10
^^^^^^^^^^

This is the 57th release of NuttX.  This release includes a combination of
some new features as well as several bugfixes.  New features include:

  * TI/Luminary Stellaris LM3S9B96.  Header file changes contributed by
    Tiago Maluta.
  * TI/Luminary Stellaris LM3S8962.  Header file changes and support for
    the Stellaris LM3S8962 Ethernet+CAN Evaluation Board contributed by
    Larry Arnold.
  * On-Demand Paging Support.  The basic logic for the On-Demand Paging
    feature is complete, implemented for the NXP LPC3131, and partially
    tested.  See http://www.nuttx.org/NuttXDemandPaging.html.  Some additional
    test infrastructure will be needed in order to complete the verification.
    See configs/ea3131/README.txt for details.
  * Two Pass Build Support.  The make system now supports a two pass build
    where a relocatable, partially linked object is created on the first
    pass and that object is linked with the NuttX libraris to produce the
    final executable on the second pass.  This two pass build is currently
    only used to support the On-Demand paging feature:  The first pass
    link forces critical logic into the locked text region; the second pass
    builds the NuttX executable more-or-less as normal.
  * CONFIG_APP_DIR. Generalized the way in which applications are built
    and linked with NuttX.  The new configuration CONFIG_APP_DIR replaces
    CONFIG_EXAMPLE.  CONFIG_EXAMPLE used to identify the sub-directory within
    the NuttX examples/ directory that held the example application to be
    built.  That made it awkward to configure to build an application that
    resides outside of the NuttX examples/ directory.  CONFIG_APP_DIR is
    more general; it can be used to refer to any directory containing the
    application to be built.

      For people who have their own configurations and/or Makefiles,
      you will need to make a couple of changes:

      - Replace all occurrences of CONFIG_EXAMPLE=foobar with
        CONFIG_APP_DIR=examples/foobar in all of the configuration
        files.
      - Replace any occurrences of examples/$(CONFIG_EXAMPLE) with
        $(CONFIG_APP_DIR)
      - Replace any occurrences of lib$(CONFIG_EXAMPLE)$(LIBEXT)
        with libapp$(LIBEXT) in your Makefiles.
      - Check any other occurrences of CONFIG_EXAMPLE.

  * Several bugfixes are included as well as code changes to eliminate
    some warnings.  See the ChangeLog for details.

nuttx-5.11
^^^^^^^^^^

This is the 58th release of NuttX.  This is a bugfix release.

  * One very important bug fixes a race condition that can occur using
    semaphores that can be awakened by signals.  Under this particular
    race condition, a task could hang waiting for a semaphore.
  * Corrections to lm3s8962 port contributed by Larry Arnold.  That
    port is purported to work correctly with these changes in place.

Plus less critical bugfixes as detailed in the ChangeLog.  New features
include:

  * A new configuration to support the mbed.org LPC1768 board (Contributed
    by Dave Marples), and
  * A driver for the Atmel AT45DB161D 4Mbit SPI FLASH part,

nuttx-5.12
^^^^^^^^^^

This is the 59th release of NuttX.  This is a critical bugfix release.

    * Fixed an important error in the signal trampoline logic.  Essentially,
      interrupts are re-enabled while the signal handler executes, but the
      logic to re-disable the interrupts before returning from the signal
      handler trampoline was missing.  Under certain circumstances, this
      can cause stack corruption.  This was discovered by David Hewson on
      an ARM9 platform, but since the code has been leveraged, the bug has
      been propogated from ARM to Cortex-M3, AVR32, M16C, SH1, ZNEO, eZ80,
      Z8, and Z80 -- almost every architecture. The correction has been
      incorporated for all architectures but only verified on a few.

Other notable changes in NuttX-5.12:

    * A complete port for the AVR32 (AT32UC3B0256) is incorporated in the
      source tree.  Testing of this port is underway now.  This release
      was made before verifying this port in order to get the important
      bugfix in place.
    * Other miscellaneous bugfix and enhancements as noted in the ChangeLog.

nuttx-5.13
^^^^^^^^^^

This is the 60th release of NuttX.  Headlines for this release include:

    * AVR32, www.mcuzone.com AVR32DEV1

      The port for the www.mcuzone.com AVRDEV1 board based on the Atmel
      AT32UC3B0256 MCU was (almost) fully integrated. The port now
      successfully passes the NuttX OS test (examples/ostest).  A
      NuttShell (NSH) configuration is in place (see the NSH User Guide at
      http://www.nuttx.org/NuttShell.html). Testing of that NSH
      configuration, however, has been postponed (because it got bumped
      by the Olimex LPC1766-STK port -- see below)

      Current Status: I think I have a hardware problem with my serial
      port setup. There is a good chance that the NSH port is complete
      and functional, but I am not yet able to demonstrate that. At
      present, I get nothing coming in the serial RXD line (probably
      because the pins are configured wrong or I have the MAX232
      connected wrong).

      A complete port will include drivers for additional AVR32 UC3
      devices -- like SPI and USB --- and will be available in a later
      release, time permitting.

    * LPC1766, Olimex LPC1766-STK

      Support for the Olimex-LPC1766 is newly added to NuttX and is
      still undergoing development, test, and integration. Verified
      configurations for the NuttX OS test and for the NuttShell (NSH,
      see the NSH User Guide at http://www.nuttx.org/NuttShell.html.
      Additional USB configurations are in the release as well, but
      they have not yet been verified.  Goals for NuttX-5.14 include:
      (1) An Ethernet driver, (2) Verified USB support, and (3) SD
      card support.

    * Additional changes and bugfixes as detailed in the ChangeLog.

nuttx-5.14
^^^^^^^^^^

The 61st release of NuttX, nuttx-5.14, was mad on November 27, 2010.  This
release includes multiple, important bugfixes as well as a new driver for
the NXP LPC1766.

Important bugfixes include:

    * Cortex-M3 Hard Fault.  Fixed a hard fault problem that can occur if certain
      types of interrupts are pending at the time another interrupt returns. This
      problem has only been observed on the LPC1766 (returning from a SYSTICK
      interrupt with a pending Ethernet interrupt).  However, it is assumed that
      all Cortex-M3 ports could have this as a latent bug.

    * TCP/IP Sequence Number Bug.  Corrected errors some important logic in the way
      that sequence numbers are managed when send() sends out packets before a
      previous packet has been acknowledged.  Some of that send() logic was incompatible
      with logic in the uIP layer.  Errors seen include: (1) The final final packet
      in a sequence of packets might be too large!  In the THTTPD example, this
      might leave some garbage at the bottom of the display. Or (2) send() might hang
      with outstanding, unacknowledged data (and with no re-transmission requests).
      This was due to differences in sequence number handling in send() and in
      uip_tcpinput.c; uip_tcpinput.c thought (incorrectly) that all of the bytes
      were acknowledged; send.c knew that they were not.

    * One-Shot POSIX Timer Bug. Fixed an error in set-up of a one-shot POSIX timer.
      It was using the repititive timer value (which is zero in the one-shot case),
      always resulting in a 10Ms timer!  Found and fixed by Wilton Tong.

Additional support has been included for the Olimex-LPC1766.  Support for that board
was added to NuttX 5.13.  This release extends that support with an Ethernet driver.
Verified configurations are now available for the NuttX OS test, for the NuttShell
(NSH, see the <a href="ttp://www.nuttx.org/NuttShell.html">NSH User Guide</a>),
for the NuttX network test, and for the THTTPD webserver. (Additional USB
configurations are in the release as well, but those have not yet been verified. 
Goals for NuttX-5.15 (and beyond) include: (1) Verified USB support, (2) SD card
support, and (3) LCD support.

nuttx-5.15
^^^^^^^^^^

The 62nd release of NuttX, nuttx-5.15, was mad on December 12, 2010.  This
release includes several bugfixes as well as feature enhancements, primarily
for the Olimex LPC1766-STK board.

Important bugfxes included:

    * Additional fixes needed with the TCP sequence number problem "fixed" in
      nuttx-5.14.
    * In the send() logic, now checks if the destination IP address is in the
      ARP table before sending the packet; an ARP request will go out instead.
      This improves behavior, for example, on the first on the first GET request
      from a browser
    * All USB class drivers need to call DEV_CONNECT() when they are ready to
      be enumerated.  That is, (1) initially when bound to the USB driver, and
      (2) after a USB reset.
    * The SPI_SETBITS macro was calling the SPI setmode method.
    * And several other bug fixes of lower criticality (see the ChangeLog for
      details).

And feature enhancements:

    * The LPC176x Ethernet driver was using all of AHB SRAM Bank0 for Ethernet
      packet buffers (16Kb).  An option was added to limit the amount of SRAM
      used for packet buffering and to re-use any extra Bank0 memory for heap.
    * Enabled networking and SD/MMC card support in the Olimex LPC1766-STK
      NuttShell (NSH) configuration.
    * The LPC176x USB driver is now fully fully functional.
    * Added an optional cmddata() method to the SPI interface.  Some devices
      require an additional out-of-band bit to specify if the next word sent
      to the device is a command or data. The cmddata method provides selection
      of command or data.
    * A driver for the Nokia 6100 LCD (with either the Phillips PCF8833 LCD
      controller and for the Epson S1D15G10 LCD controller) and an NX graphics
      configuration for the Olimex LPC1766-STK have been added.  However,
      neither the LCD driver nor the NX configuration have been verified
      as of the this release.

nuttx-5.16
^^^^^^^^^^

The 63rd release of NuttX, Version 5.16, was made on January 10, 2010 and is
available for download from the SourceForge website. This release includes
initial support for USB host in NuttX. The USB host infrstruture is new to
NuttX. This initial USB host release is probably only beta quality; it is
expected the some bugs remain in the logic and that the functionality
requires extension.

Below is a summary of the NuttX USB host implementation as extracted from
the NuttX Porting Guide:

  6.3.9 USB Host-Side Drivers
  o include/nuttx/usb/usbhost.h. All structures and APIs needed to work
    with USB host-side drivers are provided in this header file.
  o struct usbhost_driver_s. Each USB host controller driver must
    implement an instance of struct usbhost_driver_s. This structure is
    defined in include/nuttx/usb/usbhost.h.
    Examples: arch/arm/src/lpc17xx/lpc17_usbhost.c.
  o struct usbhost_class_s. Each USB host class driver must implement
    an instance of struct usbhost_class_s. This structure is also defined
    in include/nuttx/usb/usbhost.h.
    Examples: drivers/usbhost/usbhost_storage.c
  o USB Host Class Driver Registry. The NuttX USB host infrastructure
    includes a registry. During its initialization, each USB host class
    driver must call the interface, usbhost_registerclass() in order add
    its interface to the registery. Later, when a USB device is connected,
    the USB host controller will look up the USB host class driver that
    is needed to support the connected device in this registry.
    Examples: drivers/usbhost/usbhost_registry.c,
    drivers/usbhost/usbhost_registerclass.c, and
    drivers/usbhost/usbhost_findclass.c,
  o Detection and Enumeration of Connected Devices. Each USB host device
    controller supports two methods that are used to detect and enumeration
    newly connected devices (and also detect disconnected devices):
    + int (*wait)(FAR struct usbhost_driver_s *drvr, bool connected);
      Wait for a device to be connected or disconnected.
    + int (*enumerate)(FAR struct usbhost_driver_s *drvr);
      Enumerate the connected device. As part of this enumeration process,
      the driver will (1) get the device's configuration descriptor, (2)
      extract the class ID info from the configuration descriptor, (3)
      call usbhost_findclass() to find the class that supports this device,
      (4) call the create() method on the struct usbhost_registry_s
      interface to get a class instance, and finally (5) call the connect()
      method of the struct usbhost_class_s interface. After that, the class
      is in charge of the sequence of operations.
  o Binding USB Host-Side Drivers. USB host-side controller drivers are not
    normally directly accessed by user code, but are usually bound to another,
    higher level USB host class driver. The class driver exports the standard
    NuttX device interface so that the connected USB device can be accessed
    just as with other, similar, on-board devices. For example, the USB host
    mass storage class driver (drivers/usbhost/usbhost_storage.c) will
    register a standard, NuttX block driver interface (like /dev/sda) that
    can be used to mount a file system just as with any other other block
    driver instance. In general, the binding sequence is:

    1. Each USB host class driver includes an intialization entry point
       that is called from the application at initialization time. This
       driver calls usbhost_registerclass() during this initialization in
       order to makes itself available in the event the the device that it
       supports is connected.
       Examples: The function usbhost_storageinit() in the file
       drivers/usbhost/usbhost_storage.c
    2. Each application must include a waiter thread thread that (1) calls
       the USB host controller driver's wait() to detect the connection of a
       device, and then (2) call the USB host controller driver's enumerate
       method to bind the registered USB host class driver to the USB host
       controller driver.
       Examples: The function nsh_waiter() in the file
       configs/nucleus2g/src/up_nsh.c and the function nsh_waiter() in the
       file configs/olimex-lpc1766stk/src/up_nsh.c.
    3. As part of its operation during the binding operation, the USB host
       class driver will register an instances of a standard NuttX driver
       under the /dev directory. To repeat the above example, the USB host
       mass storage class driver (drivers/usbhost/usbhost_storage.c) will
       register a standard, NuttX block driver interface (like /dev/sda)
       that can be used to mount a file system just as with any other other
       block driver instance.
       Examples: See the call to register_blockdriver() in the function
       usbhost_initvolume() in the file drivers/usbhost/usbhost_storage.c.

nuttx-5.17
^^^^^^^^^^

The 64th release of NuttX, Version 5.17, was made on January 19, 2011 and is
available for download from the SourceForge website. This release follows
close on the heels of the 5.16 release and extends the USB host capabilities
first introduced in that version.

    1. The LPC17xx USB host controller driver was extended to (1) add support
       for low-speed devices, (2) handle multiple concurrent transfers on 
       different endpoints (still only one TD per endpoint), and (3) handle
       periodic interrupt endpoint types.
    2. Add a USB host HID keyboard class driver.  Now you can connect a
       standard USB keyboard to NuttX and receive keyboard input for an
       application.

And other changes as detailed in the ChangeLog.

nuttx-5.18
^^^^^^^^^^

The 65th release of NuttX, Version 5.18, was made on February 27, 2011 and is
available for download from the SourceForge website.  This is first release from
the new NuttX SVN repository.  This release is made primarily to keep the release
tarball in synchronization with SVN.  Many smaller changes have been made as
identified in the ChangeLog.  Headlines would include:

    * Incorporate several important uIP patches -- including the well known
      patch to handle missing SYNACK.
    * The Freescale mc8s12ne64 port is code complete but testing has not yet
      begun due to toolchain issues.  Added support for the Future Electronics
      Group NE64 Badge board.
    * Added support for a new STM32 board, the ISOTEL NetClamps VSN V1.2 ready2go
      sensor network platform.  This board is based on a STM32F103RET6 and
      includes some interesting power saving/clock control extensions.
    * USB host support expanded to handle vendor specific USB devices.
    * Incorporated the LUFA HID parser.
    * Various bugfix as detailed in the ChangeLog

nuttx-5.19
^^^^^^^^^^

The 66th release of NuttX, Version 5.19, was made on March 12, 2011 and is
available for download from the SourceForge website.  This release includes
several new features in various states of integration and maturity:

    * 486SX QEMU port.  This port supports the Intel 486SX architecture using
      the QEMU simulator.  Initial functionality is in place a partially
      tested.  There are still some outstanding issues with timer interrupts.
    * Platform specific application support.  A new apps/ directory appears in
      this port.  This apps/ directory provides a mechanism for applications
      using NuttX to have a highly customizable initialization process. It
      supports a set of end-user applications than can be executed (1) standalone
      so you can have a fully customizable application startup, or (2) on top of
      NSH.  Think of it this way:  In a buckled-up embedded application, your
      end-user programs will probably have their own dedicated start-up logic.
      But, during development, you might want to have you applications
      available and executable from the NSH command line.  This apps/ add-on
      (and NSH hooks) was contributed by Uros to accomplish just that.
    * NSH was also extended to support application specific ROMFS
      /etc/init.d/rcS start-up scripts.  This feature, as well, as all of the
      above-mentioned apps/ directory support was contributed by Uros Platise
    * Additional NSH improvements and bug fixes.  See the Changelog for
      details.
    * This release also provides a new SLIP network driver.  This driver
      should support point-to-point network communications to a host using
      TCP/IP or UDP.  This driver is code complete, but not tested in this
      release.
    * New RAMTRON FRAM driver (contributed by Uros Platise)
    * New generic 16550 UART driver.
    * Cortex-M3 Power improvements: Waits for Interrupt (WFI) in idle loop
      for reduced power consumption (LPC17xx and STM32 only - contributed by
      Uros Platise))
    * New waitpid() system interface.
    * Additional bugfixes: pipes, stdint.h, STM32 SDIO and SPI drivers

nuttx-6.0
^^^^^^^^^

The 67th release of NuttX, Version 6.0, was made on March 21, 2011 and is
available for download from the SourceForge website.  The version number of
this release was bumped from 5.19 to 6.0.  A change in the major revision
number is used to reflect an incompatibility with previous versions.  In
this release, the NuttX core OS functionality has been separated from NuttX
application-related functionality.  These are provided as separate tarballs:

    * nuttx-6.0.tar.gz, and
    * apps-6.0.tar.gz

The purpose of this separation is both to better organize and modularize the
NuttX source tree, but also to provide better support for incorporation of
end-user applications with Nuttx.

The incompatibily results from the changes to the board configuration logic
needed to supported the separable application.  The major changes to the
configuration include:

    * CONFIG_APPS_DIR - This should not be set.  The default is ../apps.  This
      should only be set if you have a custom, product-specific application
      directory in some different location.

    * appconfig - Each board configuration now requires a new file called 
      'appconfig.'  As its name suggests, this file provides new configuration
      information needed by the logic in ../apps.

In addition to this major reorganization in the directory structure, this
release also includes some important extensions to existing features and some
important bugfixes.  These include:

    * The SLIP driver was been well debugged and significantly re-designed.
      Now you can have an Ethernet connection to you board even if you have
      no Ethernet hardware.  How cool is that?

    * The QEMU i486 port is now functional.  It has also been reported to
      work on the Bifferboard (see http://bifferos.bizhat.com/).

    * And extensions to the uIP driver interface, and

    * Bug fixes to fopen() and STM32 GPIO configuration

Please see the ChangeLog for details.

nuttx-6.1
^^^^^^^^^

The 68th release of NuttX, Version 6.1, was made on April 10, 2011 and is
available for download from the SourceForge website.  The 6.0 release
introduced a detach-able application environment to build applications
outside of the NuttX source tree.  The primary purpose of this release
is to correct numerous build problems introduced by that architectural
change:

    * In many newer environments, NuttX produced strange Makefile errors
      but built correctly in older environments.  A fix provided by
      Rafael Noronha was incorporated and is reported to fix those build
      problems.
    * The apps/ directory build system would not handle Windows-native
      toolchains due to obscure path formatting issues.
    * And other problems as detailed in the change log.

Many additional changes were made in the 6.1 release for another major
architectural change:  NuttX will now build as a seperately linked micro-
kernel.  In this build option the RTOS builds as a kernel, applications
build separtate and interface with kernel via system calls.  Applications
run in user mode and kernel logic users in kernel-mode.  This provides a
secure environment for NuttX.  This feature is fully coded in NuttX-6.1,
but has not been tested due to higher priority tasks that have arisen.

Related to this change, support for the Cortex-M3 memory protection unit (MPU) has
been integrated with the NuttX kernel build to provide an even higher level
of security.

NOTE: This kernel build is an option; the default build configuration is
still the standard, flat, unsecured RTOS as in previous releases.

Additional new features in this release:

    * Support for LPC17xx GPIO interrupts (with much support from Decio Renno).
    * Basic timer support for STM32 (Contributed by Uros Platise)
    * A binfs file system.  This is a tiny psuedo file system that lets
      named appliations to be viewed and accessed in NSH under the /bin
      directory.
    * An I2C-based driver for the LIS331DL MEMS motion sensor (Contributed
      by Uros Platise).
    * A board configuration for the Embedded Artists LPCXpresso LPC1768 board.
    * The user_initialize() interface has been removed.

And several bugfix associated with SD drivers, openddir(), signed 8-bit types
(int8_t), and USB serial device.  See the ChangeLog for details.

nuttx-6.2
^^^^^^^^^

The 69th release of NuttX, Version 6.2, was made on May 6, 2011 and is
available for download from the SourceForge website.  The 6.2 release
includes several new features:

    * NXFFS: The obvious new feature is NXFFS, the NuttX wear-leveling
      FLASH file system.   This new file system is intended to be
      small for the MCU usage and has some limitations.  No formal
      documentation of NXFFS yet exists.  See the fs/nxffs/README.txt
      file for details (see
      http://nuttx.svn.sourceforge.net/viewvc/nuttx/trunk/nuttx/fs/nxffs/README.txt?view=log)
    * Support for NXP LPCXpresso LPC1768 board on the Embedded
      Artists base board.  The Code Red toolchain is supported under
      either Linux or Windows.   Verifed configurations include dhcpd,
      nsh, nx, ostest, thttpd, and usbstorage.
    * Support for the Univision UG-9664HSWAG01 OLED with Solomon
      Systech SD1305 LCD controller.
    * A new RAM MTD driver with FLASH simulation capability.
    * A version.h file is now automatically generated so that C code
      can now be version-aware.

In addition to these new feature, several important bugfixes are included
in this release correcting problems with dup2(), LPC17xx GPIO interrupts,
LPC17xx UART2/3, the FAT file system, build issues, and strrch(). See the
ChangeLog for more details.

nuttx-6.3
^^^^^^^^^

The 70th release of NuttX follows only a nines days after the release of
version 6.2.  It was released on May 15, 2011.  This special back-to-back
release was made so that the current released version of NuttX will
correspond to the initial release from the RGMP project.

This release adds architecture support and build configuration for RGMP.
RGMP is a project for running GPOS and RTOS simultaneously on multi-
processor platforms. See http://rgmp.sourceforge.net/wiki/index.php/Main_Page
for further information about RGMP.

This release also includes support for STM32 FLASH, build improvements,
and initial, incomplete support for the MicroChip PIC32MX MCU.  Bug fixes
are included for some build problems, USB host class driver error handling,
NX graphics color mapping, and problems with C standard I/O buffer flushing.
See the ChangeLog for further details.

nuttx-6.4
^^^^^^^^^

The 71st release of NuttX, Version 6.4, was made on June 6, 2011 and is
available for download from the SourceForge website.  The 6.4 release
includes several new features:

    * A new, full-featured FTP client.  This client may be used as a library
      for automated FTP or via an FTP client shell.  The FTP shell supports
      the following commands: cd, chmod, get, help, idle, login, ls, quit,
      mkdir, noop, put, pwd, rename, rhelp, rm, rmdir, size, time, and up.
      A configuration is available for the NXP LPC17xx to demonstrate this
      functionality.
    * A functional C1101 wireless driver (contributed by Uros Platise)
    * A PCI-based E1000 Ethernet driver (contributed by Yu Qiang)
    * New C library functions: inet_addr() (contributed by Yu Qiang),
      strndup(), asprintf()
    * Reduced memory allocation overhead for MCUs with small heaps (<64Kb).
    * fdopen() now works with socket descriptors allowing standard buffered
      C functions to be used for network communications.
    * The NSH ifconfig command can now be used to set or change the IP
      address (contributed by Yu Qiang)

This release also includes some completed but untest functionality.

    * The MicroChip PIC32MX port is now code complete and ready to begin
      testing.  Unfortunately, testing will be delayed due to tool issues.
    * Support for the NXP LPC315x MCUs.

Additional miscellaneous enhancements and bug fixes to task_delete(), recvfrom(),
and other changes as noted in the ChangeLog.

nuttx-6.5
^^^^^^^^^

The 72nd release of NuttX, Version 6.5, was made on June 21, 2011 and is
available for download from the SourceForge website.  The 6.5 release
is all about support for the Atmel 8-bit AVR family.  I have been
interested in the AVR family for some time but because of the severe
SRAM constraints and because of the availability of many tiny schedulers
for the AVR, it has not been "on the radar screen."  However, I have
recently become interested because of interest expressed by members of
the forum and because of the availability of newer, larger capacity AVR
parts (that I don't have yet).

This release includes support for the following AVR boards.  As with any
initial support for new architectures, there are some incomplete areas
and a few caveats that need to be stated.  Here they are, ordered from
the least to the most complete:

    * SoC Robotics Amber Web Server (ATMega128).

      This port of NuttX to the Amber Web Server from SoC Robotics
      (http://www.soc-robotics.com/index.htm).  Is only partially in place.
      The Amber Web Server is based on an Atmel ATMega128 (128Kb FLASH
      but only 4Kb of SRAM).

      STATUS: Work on this port has stalled due to toolchain issues.  It
      is complete, but untested.

    * Micropendous 3 AT9USB647

      This port of NuttX to the Opendous Micropendous 3 board. The
      Micropendous3 may be populated with an AT90USB646, 647, 1286, or
      1287.  See http://code.google.com/p/opendous/. I have only the
      AT90USB647 version for testing.  This version has very limited
      memory resources: 64Kb of FLASH and 4Kb of SRAM.

      STATUS: The basic port was released in NuttX-6.5.  This basic port
      consists only of a "Hello, World!!" example that demonstrates
      initialization of the OS, creation of a simple task, and serial
      console output.  The tiny SRAM limits what you can do with the
      AT90USB647 (see issues below).

    * PJRC Teensy++ 2.0 AT9USB1286

      This is a port of NuttX to the PJRC Teensy++ 2.0 board.  This board
      was developed by PJRC (http://pjrc.com/teensy/). The Teensy++ 2.0 is
      based on an Atmel AT90USB1286 MCU with 128Kb of FLASH and 8Kb of SRAM;
      a little more room to move than the AT90USB647.

      STATUS:  The basic port was released in NuttX-6.5.  This basic port
      consists of a "Hello, World!!" example and also slightly simplified
      NuttShell (NSH) configuration (see the NSH User Guide at
      http://www.nuttx.org/NuttShell.html).

      An SPI driver and a USB device driver exist for the AT90USB as well
      as a USB mass storage configuration.  However, this configuration is not
      fully debugged as of the NuttX-6.5 release.

AVR-specific issues.  The basic AVR port is solid and biggest issue for using
AVR is its tiny SRAM memory and its Harvard architecture.  Because of the
Harvard architecture, constant data that resides to flash is inaccessible using
"normal" memory reads and writes (only SRAM data can be accessed "normally").
Special AVR instructions are available for accessing data in FLASH, but these
have not been integrated into the normal, general purpose OS.

Most NuttX test applications are console-oriented with lots of strings used
for printf and debug output.  These strings are all stored in SRAM now due to
these data accessing issues and even the smallest console-oriented applications
can quickly fill a 4-8Kb memory.  So, in order for the AVR port to be useful,
one of two things would need to be done:

1. Don't use console applications that required lots of strings.  The basic
   AVR port is solid and your typical deeply embedded application should work
   fine.

2. Create a special version of printf that knows how to access strings that
   reside in FLASH (or EEPROM).

nuttx-6.6
^^^^^^^^^

The 73rd release of NuttX, Version 6.6, was made on July 11, 2011 and is
available for download from the SourceForge website.  The 6.6 release
adds several smaller featurs but is mostly a bugfix release.

Bugfixes include

    * Fixed several NX Graphics bugs: Rendering fonts at >8 bits-per-pixel,
      graphics move logic, and display artifacts that appear when a window
      is closed.
    * Corrections to the USB host mass storage class driver
    * STM32 bugfixes: serial driver, GPIO interrupt handling
    * LPC17xx: Changes for a success compilation with no console.
    * Corrections to the Teensy AT90USB SD driver
    * Changes for a clean compilation under the ZDS-II toolchain.

Minor features:

    * Add logic to extract printf strings from FLASH (but there are still printf
      issues for that target)
    * Added a configuration for the Sure Electronics PIC32MX board.  However,
      higher priority tasks have stopped work on that configuration.
    * Added several new configurations for the STMicro STM3210E-EVAL board.
    * Added support for the STM3210E-EVAL board: (1) LCD in either landscape or
      portrait mode, and (2) interrupting buttons.
    * Added a configuration option to use different serial ports for debug
      and for the NSH serial console (there are some issues with CR-LF
      expansion and character echo if NSH is not run on the console).
    * Standardized the button press and button interrupt interfaces so that they
      are common across all boards.
    * Added a new graphics example that focuses on placing text on the background
      while pop-up windows occur.  Text should continue to update normally with
      or without the popup windows present.
    * Added ARM stack checking logic.

See the ChangeLog for a detailed description of these changes.
