handle multiple sectors.

This reverts commit 844d088c51.

(including logical partitions).

other.

eventually get updated.

provides them.

now-obsolete pxe.c.

permanent processes, rather than requiring each one to have its own
initialisation function.

5.4 bugs when driving ourselves via UNDI.

suspect that we need it, and implementing it would require needlessly
complicating the net device API.

Convert printf() to DBG(); printf() is not allowed in drivers.

handed a P_UNKNOWN packet.