The original, unmodified portions of ChibiOS retain their original copyright notices, for the portions of code to which they still apply.
Disable serial, enable I2C2, set clock source to HSI48.
Based on the RT-STM32F072-DISCOVERY demo from ChibiOS/demos/STM32. The board definition was made with the Eclipse plugin, and is based on the ST_STM32F072B_DISCOVERY board definition from ChibiOS/os/hal/boards.