Documentation/ReleaseNotes/NuttX-6.1 - nuttx - Git at Google

 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 Changelog.

 Many additional changes were made in the 6.1 release for another
 major architectural change: NuttX will now build as a separately
 linked microkernel. In this build option the RTOS builds as a
 kernel, applications build separately 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 pseudo file system that
 lets named applications 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 configuration for the Embedded Artists LPCXpresso LPC1768 board.
 * The user_initialize() interface has been removed.

 And several bugfix associated with SD drivers, opendir(), signed
 8-bit types (int8_t), and USB serial device. 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 Changelog.

	Many additional changes were made in the 6.1 release for another
	major architectural change: NuttX will now build as a separately
	linked microkernel. In this build option the RTOS builds as a
	kernel, applications build separately 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 pseudo file system that
	lets named applications 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 configuration for the Embedded Artists LPCXpresso LPC1768 board.
	* The user_initialize() interface has been removed.

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