diydrones/PX4NuttX — pull request #3 by geeksville (2014-05-26 18:08:53+00:00)
Title: stm32-rtc: Add support for the internal low speed clock (LSI)

Some boards do not have the external 32khz oscillator installed, for those boards we must fallback to the crummy
internal RC clock. Turn on by defining CONFIG_RTC_LSICLOCK