hpibbus0 at nhpib0
ppi0 at hpibbus0 slave 5 punit 0
=3Dpt%A1bit dma, async, scsi id 7t9=3Dx%x=3DM
 ^^^^^                          ^^^^^^^   corruption here ?
 Problem with the scsi controller ?

Hmm, looking at this brings me to the question which ipl your SCSI / =
serial uses... looks like making the SCSI controller generate interrupts =
that come mysteriously to the serial handler ?!
Maybe the serial console handler is a bit of a hack to make it work =
before the kernel probes for peripherals ?

bye
Michael