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Major changes: TCP/IP network stack; Atmel SAM3X support; an experimental IAR port for Cortex-M3; and support for the AVR XMega CPU family. Support for STM32F100RB. A priority inheritance protocol for semaphores. EMAC drivers for
SAM7X and SAM3X, NAND KBlock device, seven segment display, and Himax HX8347 LCD controller. A TFTP server. A new interface for the PWM driver.

This release builds upon the work done for the 2.5 series, and delivers many new drivers for internal MCU peripherals, USB support, Atmel SAM3N support, and a new API for block devices. New supported CPU: Atmel SAM3N Cortex-M3. Atmel ATmega1280 and Arduino Mega code. New module: USB support for STM32. New drivers: usb-serial, USB keyboard, and USB mouse. A new interface for block devices: KBlock. A new module: generic event completion infrastructure. A new and more flexible I2C API.

This version fixes a build bug in empty and kernel presets for lm3s-based projects. All users are encouraged to upgrade their existing installations.

LM3S1968 and LM3S8962 Cortex-M3, STM32F103RB, LPC2378, and AVR ATmega328P CPUs are now supported. Support for the ATmega168 was improved. A rit128x96 graphical display driver was added; Support for Arduino 2009, Atmel AT91SAM7S-EK and AT91SAM7X-EK, Develer Triface, Luminary EK-LM3S1968, and Olimex LPC-P2378 and STM32-P103 development boards was added. APRS tracker using Arduino, SD card data logger, generic I/O board, and DevelGPS GPS tracker sample programs were added. Many benchmarks were added. Context switch is now down to 2.2us and the memory footprint is as low as 2.2KB. A new hashtable module was added,

This is a minor release that brings performance improvements for the kernel module, more documentation, and a few bugfixes.