basic i/o functions, bit-banging mechanism is implemented by dev/iicbus/iicbb.c
immio.c: some bootverbose logs to watch zip+ connect/disconnect process
- ppbus was released before checking if still in disk_mode by vpoio and immio:
the microseq (in_disk_mode) was never executed. Fixed.
- nlptintr() renamed to nlpt_intr(). spltty() inserted in nlptintr() before
nlpt_intr() call
