this SS2 has run NetBSD for me for several years, and is running 1.5H quite happily,
but -current (1.5N) fails:


[ ... ]
sbus0 at mainbus0 ioaddr 0xf8000000: clock = 20 MHz
dma0 at sbus0 slot 0 offset 0x400000: rev 1+
esp0 at sbus0 slot 0 offset 0x800000 level 3: ESP100A, 20MHz, SCSI ID 7
scsibus0 at esp0: 8 targets, 8 luns per target
[ ... ]
sd3 at scsibus0 target 3 lun 0: <SEAGATE, ST1480   SUN0424, 7516> SCSI2 0/direct fixed
sd3: 411 MB, 1476 cyl, 9 head, 63 sec, 512 bytes/sect x 843284 sectors
[ ... ]
root on sd3a dumps on sd3b
dma0: error: csr=9440031e<ERR,DRAINING=3,IEN,WRITE,ENDMA,BURST=0,FASTER,ALOADED>
esp0: DMA error; resetting
esp0: waiting for SCSI Bus Reset to happen
dma0: error: csr=9440031e<ERR,DRAINING=3,IEN,WRITE,ENDMA,BURST=0,FASTER,ALOADED>
esp0: DMA error; resetting
esp0: waiting for SCSI Bus Reset to happen
dma0: error: csr=9440031e<ERR,DRAINING=3,IEN,WRITE,ENDMA,BURST=0,FASTER,ALOADED>
esp0: DMA error; resetting
esp0: waiting for SCSI Bus Reset to happen
sd3: disk label read error
no file system for sd3 (dev 0x718)
cannot mount root, error = 79
root device (default sd3a):