browsing the driver code implies that netbsd will discover 3 hpc chips,
with 2 scsi busses on the first hpc. has anyone successfully used the
dual-scsi-plus-ethernet mezzanine in a challenge S? i haven't dug the
hardware out of the garage yet to see if it "just works", but i don't
see it discussed on the mailing list archive, nor does it look like the
code knows about it ... i probably have an extra mezz card, might be
able to get some technical details (i'm guessing this really amounts
to "the address of the chip"), and/or could make a machine available
if it helps.

i did install netbsd/sgimips on a regular (headless, server) indy,
very impressive work!