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

firmware/chibios/demos/ARMCM3-STM32L152-DISCOVERY/readme.txt

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+*****************************************************************************
+** ChibiOS/RT port for ARM-Cortex-M3 STM32L152.                            **
+*****************************************************************************
+
+** TARGET **
+
+The demo runs on an ST STM32L-Discovery board.
+
+** The Demo **
+
+The demo shows how to use the ADC, PWM and SPI drivers using asynchronous
+APIs. The ADC samples two channels (temperature sensor and PC0) and modulates
+the PWM using the sampled values. The sample data is also transmitted using
+the SPI port 2 (NSS=PB12, SCK=PB13, MISO=PB14, MOSI=PB15).
+By pressing the button located on the board the test procedure is activated
+with output on the serial port COM1 (USART1).
+
+** Build Procedure **
+
+The demo has been tested by using the free Codesourcery GCC-based toolchain
+and YAGARTO. just modify the TRGT line in the makefile in order to use
+different GCC toolchains.
+
+** Notes **
+
+Some files used by the demo are not part of ChibiOS/RT but are copyright of
+ST Microelectronics and are licensed under a different license.
+Also note that not all the files present in the ST library are distributed
+with ChibiOS/RT, you can find the whole library on the ST web site:
+
+                             http://www.st.com