NuttX-6.22
----------

The 89th release of NuttX, Version 6.22, was made on September 29, 2012,
and is available for download from the SourceForge website. Note
that release consists of two tarballs: nuttx-6.22.tar.gz and
apps-6.22.tar.gz. Both may be needed (see the top-level nuttx/README.txt
file for build information).

This release corresponds with SVN release number: r5206

Note that all SVN information has been stripped from the tarballs. If you
need the SVN configuration, you should check out directly from SVN. Revision
r5206 should equivalent to release 6.22 of NuttX 6.22:

svn checkout -r5206 svn://svn.code.sf.net/p/nuttx/code/trunk nuttx-code

Or

svn checkout -r5206 http://svn.code.sf.net/p/nuttx/code/trunk nuttx-code

Additional new features and extended functionality:

* RTOS: Application entry point is no longer user_start, but can be
configured using CONFIG_INIT_ENTRYPOINT. NuttX now supports two work
queues: A lower priority work queue (for extended processing) and a
higher priority work queue (for quick, high priority operations).

* Memory Management: Added a new granule-based allocated that can be
used to manage, aligned and quantized DMA memory.

* File System: Add hooks to allocate I/O memory with and external
allocated (need if required by DMA).

* Networking: ENC28J60 driver is (finally) verified.

* Drivers: Add hooks USB device drivers to allocate I/O memory with and
external allocated (need if required by DMA). Driver for the Windbond
SPI FLASH family (W25x16, W25x32, W25x64, and others). ADS7843E driver
extended for TSC2046 and XPT2046 and verified.

* ARMv7-M: Added logic to reset the MCU using the NVIC.

* STM32: Add support for STM32F103VET6.

* STM32 Drivers: Add logic to re-initialize UARTs a second time to
enable DMA (Mike Smith). I2C driver error recovery (Mike Smith).

* STM32 boards: Support for USB host added add to several configurations
(or at least explained in README files). Support for the Shenzhou
STM32F107 board (see www.armjishu.com). Support for M3 Wildfire
STM32F103 board (v2 and v3).

* Build System: Kconfig string de-quoting logic. Remove comments from
defconfig files (Kate). Add tool to create NuttX-style symbol tables.
Numerous changes to configuration logic as needed for the new mconf-based
configuration (much of this from Richard Cochran). Refactor common
Make.defs logic into tools/Config.mk (Richard Cochran).

* Library: Configurable terse output from strerror(). Added perror() (Kate).
Add %n format to sscanf() (Kate).

* Applications: Numerous changes and extensions to the old uIP web server
(from Kate and Max Holtzberg, see the ChangeLog for specific extensions).
UDP network discovery utility (Max Holtzberg). Embeddable Lightweight
XML-RPC Server (http://www.drdobbs.com/web-development/an-embeddable-lightweight-xml-rpc-server/184405364, Max Holtzberg).

Bugfixes (see the change log for details). Some of these are very important
(marked *critical*):

* RTOS: Fixes to priority inheritance logic (*critical*). waitpid()
critical section. Assertion in work_cancel() (Mike Smith). mmap() (Kate).

* FAT File System: Improper Boolean expression caused un-necessary writes
and performance issues (*critical*, Ronen Vainish).

* Networking: Remove an un-necessary delay from recvfrom(). This greatly
improves network performance (*critical*, Max Holtzberg).

* Graphics: NX parameter checking errors.

* Drivers: Fix double release of memory in SDIO-based, MMC/SD driver
(Ronen Vainish).

* LPC17xx: Ethernet driver fixes needed for certain PHYs (Kate).

* AVR: Fix build error (Richard Cochran).

* STM32: USB OTG FS host driver NAKing an retries. Power management
compilation errors (Diego Sanchez). Missing SPI3 remap logic.

* STM32 Drivers: Fix for Ethernet errata for STM32F107 (*critical*).
Ethernet buffer alignment check. Add "kludge" to Ethernet driver to
handle DM9161 PHY which (at least on the Shenzhou board), sometimes
does not come up correctly.

* Applications: THTTPD (Kate). NSH ping when IP address is on a different
network (Darcy Gong).

* Library: fread(), fflush(), fdopen(): Fix error handling logic (Ronen
Vainish). Fix some field-width handling issues in sscanf()

As well as other, less critical bugs (see the ChangeLog for details)