Matt Thomas wrote:
It boots fine off the CD but hangs probing scsibus0.

> (off jazzsiop0).  I have no devices hanging off it;
> everything is off scsibus1.

My output from my RISCServer 2200 (remember there
is also a model RISCServer Express 2200..which do you
have ?) is listed below..
Where done it fail on your unit?

cpu0 at mainbus0: MIPS R4400 CPU (0x460) Rev. 6.0 with MIPS R4010 FPC Rev. 0.0
cpu0: L1 cache: 16KB/32B instruction, 16KB/32B data, direct mapped
cpu0: L2 cache: 2048KB/64B mixed, no snooping
jazzio0 at mainbus0
aclock0 at jazzio0 addr 0xe0004000 intr 0: mc146818 or compatible
lpt0 at jazzio0 addr 0xe0008000 intr 1
fdc0 at jazzio0 addr 0xe000c000 intr 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
sn0 at jazzio0 addr 0xe0001000 intr 4: bufsize 28480 address 00:00:4c:75:2d:2a
arcsiop0 at jazzio0 addr 0xe0002000 intr 5: SCSI ID 7
arcsiop1 at jazzio0 addr 0xe0003000 intr 6: SCSI ID 7
scsibus1 at arcsiop1: 8 targets, 8 luns per target
pckbc0 at jazzio0 addr 0xe0005000 intr 7
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pms at jazzio0 addr 0xe0005000 intr 8 not configured
com0 at jazzio0 addr 0xe0006000 intr 9: ns16550a, working fifo
com0: txfifo disabled
com1 at jazzio0 addr 0xe0007000 intr 10: ns16550a, working fifo
com1: txfifo disabled
isabr0 at mainbus0
isa0 at isabr0 isa_io_base 0xe2000000 isa_mem_base 0xe3000000
wdc0 at isa0 port 0x1f0-0x1f7 irq 14
wd0 at wdc0 channel 0 drive 0: <WDC AC11200L>
wd0: drive supports 16-sector PIO transfers, LBA addressing
wd0: 1222 MB, 2484 cyl, 16 head, 63 sec, 512 bytes/sect x 2503872 sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
vga0 at isa0 port 0x3b0-0x3df iomem 0xa0000-0xbffff
wsdisplay0 at vga0: console (80x25, vt100 emulation), using wskbd0
scsibus0: waiting 2 seconds for devices to settle...
scsibus1: waiting 2 seconds for devices to settle...
sd0 at scsibus1 target 0 lun 0: <DEC, RZ25     (C) DEC, 0900> SCSI2 0/direct
fix
ed
sd0: 406 MB, 1476 cyl, 9 head, 62 sec, 512 bytes/sect x 832527 sectors
cd0 at scsibus1 target 1 lun 0: <TOSHIBA, CD-ROM XM-5301TA, 1895> SCSI2 5/cdrom

removable
boot device: sd0
root on sd0a dumps on sd0b
root file system type: ffs
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)
wsdisplay0: screen 5 added (80x25, vt100 emulation)
wsmux1: connecting to wsdisplay0