ChibiOS 2.6.8, until I can figure out where to get it from git.

firmware/chibios/demos/ARM7-AT91SAM7X-GCC/readme.txt

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+*****************************************************************************
+** ChibiOS/RT port for ARM7TDMI AT91SAM7X256.                              **
+*****************************************************************************
+
+** TARGET **
+
+The demo runs on an Olimex SAM7-EX256 board.
+
+** The Demo **
+
+The demo currently just flashes the LCD background using a thread.
+The button SW1 prints an "Hello World!" string on COM1, the button SW2
+activates che ChibiOS/RT test suite, output on COM1.
+
+** Build Procedure **
+
+The demo was built using the YAGARTO toolchain but any toolchain based on GCC
+and GNU userspace programs will work.
+
+** Notes **
+
+Some files used by the demo are not part of ChibiOS/RT but are Atmel copyright
+and are licensed under a different license, see the header present in all the
+source files under ./demos/os/hal/platform/AT91SAM7/at91lib for details.
+Also note that not all the files present in the Atmel library are distribuited
+with ChibiOS/RT, you can find the whole library on the Atmel web site:
+
+                             http://www.atmel.com