Hmm.. it would be really nice to get this board working with dRonin considering the price point -- at $24 it's about half the price of the full Revo or Sparky2. Probably the least expensive F4 FC on the market right now.
tracernz perhaps it's OK to ignore the RFM22b radio, barometer or magnetometer failures -- isn't it better to have a FC that still runs dRonin even if some of the optional or non-essential sensors are missing or broken?
IMHO, I'd rather have these sensors not working rather than the entire FC not working.
BTW, when using BetaFlight Configurator to flash ef_revolution.hex to this board, Full Chip Erase needs to be off otherwise it gets stuck Erasing...
The command line for installing the dRonin boot loader is:
dfu-util -v -d 0483:df11 -c 1 -i 0 -a 0 -D bl_revolution.bin -s 0x08000000