Ok, it ran when bound to /sys/src/9/bcm. Flawless success. @cinap_lenrek,
the folder was the source for the bcm kernel thing I linked above, it's
built to support GPIO afaik, I'd like to play with GPIO whilst I learn
plan9 on this pi.

If I may ask, what is the reason that it ran when bound to bcm, permissions
or something?