Prep for 6.9 Release

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3950 42af7a65-404d-4744-a932-0658087f49c3

ReleaseNotes

@@ -2226,3 +2226,73 @@ below:
     both developed and submitted by Li Zhouy (Lzzy)).
 
 See the Changelog for additional changes included in this release.
+
+NuttX-6.9
+^^^^^^^^^
+
+The 76th release of NuttX, Version 6.8, was made on September 11, 2011
+and is available for download from the SourceForge website.  Note
+that release consists of two tarballs:  nuttx-6.9.tar.gz and
+apps-6.9.tar.gz.  Both may be needed (see the top-level nuttx/README.txt
+file for build information).
+
+This release includes a few new features and several important bug fixes.
+The new features (some still incomplete) include:
+
+  * Analog Support/ NXP LPC17xx: New DAC sub-system including ADC and DAC
+    drivers for the LPC17xx.  Extensions to the ADS1255 driver.
+    (Contributed by Li Zhuoyi (Lzyy))
+
+  * Power Management:  Added a new NuttX power management sub-system for
+    controlling and coordinating reduced power states.  At present, only
+    verified in a simulation environment.
+
+  * I2C Test Tool:  A new application was added that can be used to
+    verify and debug I2C interfaces from the NuttShell (NSH) command
+    line.
+
+  * NuttShell (NSH):  In addition to the I2C test tool, a date command
+    is now supported (if CONFIG_RTC is defined) that can be used to
+    read and set the RTC.
+
+  * NXP LPC17xx: I2C and DAC driver for the NXP LPC17xx family submitted by Li Zhuoyi
+   (Lzyy)
+
+  * Kinetis Cortex-M4:  Added a SDHC driver for the Kinetis parts.
+    Complete debug of the Kinetis SDHC driver was not completed, however,
+    do to some higher priority tasks that forced me to stop work.
+
+  * Other new drivers: Driver for I2C-based at24cxx EEPROM submitted by
+    Li Zhuoyi (Lzyy); Driver for the LM-75 temperature sensor.  Support
+    for the LM-75 temperature sensor integrated into the SM3210E-EVAL
+    development board.
+
+  * NuttX Graphics (NX):  Added new NX interfaces for drawing circles,
+    both circle outlines and filled circles.
+
+  * FLASH: Added a function that accepts the path to a block driver and
+    then erases the underlying FLASH memory
+
+  * Build System:  The Make export logic now also tries to track down all
+    architecture-specific header files and include these in the NuttX
+    export bundle as well.  Various changes and modifications so that
+    NuttX wil build on FreeBSD using the ASH shell (submitted by Kurt Lidl).
+
+Bugfixes, order roughly on decreasing criticality include:
+
+  * STM32 I2C Driver:  Add resets, timeout, and other fixes to work
+    reliably with the I2C tool.  Corrected a major error introduced in
+    NuttX 6.8.
+
+  * BCH Driver.  Several important bugs (noted by Li Zhuoyi (Lzyy))
+    were fixed.
+
+  * C Library:  Fixed errors in gmtime() and gmtime_r() that could lead to
+    errors in date calculations.
+
+  * Timing:  Correct an error in the tv_nsec calculation that happens
+    only config CONFIG_RTC is enabled
+
+  * Build System: Use of -print-libgcc-file-name to get path to
+    libgcc.a might select the wrong libgcc.a if a multilib toolchain
+    is used