This configures the RTC clock to use the HSE instead of the not existing
LSE clock which prevents boot waiting for the not existing LSE crystal
for a few seconds on startup.
- during casual testing on default configs the stack was penetration was reaching ~90% which is a bit too close for comfort
- increasing by 50% to be conservative
known issues:
- flash-based params does not work on H7 (due to ECC), so params are on
SD card. The last flash sector is still reserved however.
- output channel 6 does not support DShot (the implementation does not
handle channel gaps)
- flashing of the 2. flash bank is much slower (around 3x), than the 1.
bank for some unknown reason.
- after the BL jumps to the app, there's several seconds passing until
stm32_boardinitialize() is called.
Julian Oes