Hi,
I wrote a small demo for the STM32F4-Discovery, the guide is available here:
http://www.chibios.org/dokuwiki/doku.ph … _discovery
Similar guides are also available for the STM32VL-Discovery:
http://www.chibios.org/dokuwiki/doku.ph … _discovery
…and STM32L-Discovery:
http://www.chibios.org/dokuwiki/doku.ph … _discovery
Benchmark results are available here: http://www.chibios.org/dokuwiki/doku.ph … st_reports
Giovanni