Back in the arm32 world, the contrib/miller/9/bcm kernel source is now stable and useable on pi4, after fixing some old emmc bugs, and thanks to cinap for spotting that no-execute bits have to be set in device space page tables to prevent speculative instruction fetches from device registers (!).
Wifi is still the only supported device so far. Rather than re-inventing wheels, I'll adopt 9front drivers for the rest (after I've caught up with some other work).
