Hi,I've got a problem with cdrom  sgimips 3.99 iso booting on IP20: 
message follows:

restenv
typed in

setenv systempartition scsi(0)disk(4)rdisk(0)partition(8)
setenv osloadpartition scsi(0)disk(4)rdisk(0)partition(8)
setenv osloadfilename netbsd
setenv osloadoptions auto
setenv osloader boot
boot -f scsi(0)disk(4)rdisk(0)partition(8)aoutboot
42288+5464+1368 entry: 0x88002000

NetBSD/sgimips 3.99.21 Bootstrap, Revision 1.2
(martin@night-porter.duskware.de, Sat Jun 10 00:24:03 CEST 2006)

devopen: scsi(0)disk(4)rdisk(0)partition(0) type scsi file ip2x
sc0,4,0: cmd=0x28timeout after 10 sec. Resetting SCSI bus
dks0d4s0: retrying request
dks0d4s0: Drive not ready: Driver not ready, ASQ=0x1,.
dks0d4s0: Drive not ready: Driver not ready, ASQ=0x1,.
dks0d4s0: Drive not ready: Driver not ready, ASQ=0x1,.
open: scsi(0)disk(4)rdisk(0)partition(0)ip2x: Input/output error
devopen: scsi(0)disk(4)rdisk(0)partition(0) type scsi file netbsd
dks0d4s0: Drive not ready: Driver not ready, ASQ=0x1,.
dks0d4s0: Can't read volume header
open: scsi(0)disk(4)rdisk(0)partition(0)netbsd: Input/output error
Boot failed! Halting...