Okay, one more thing I've discovered: when the crash occurs under fsck, =
it always occurs with exactly the same disk address. For instance, while =
it is cleaning /dev/wd0a I get
  wd0e: Error reading fsbn 48 of 48-51 (wd0 bn 204848 cn 216 tn 11 sn =
35)

Interesting that it is an error reading wd0e when it is trying to fsck =
wd0a. Eventually this gives up , and we get

  wd0a: Error reading fsbn 35088 of 35088-35103 (wd0 bn 35088 cn 37 tn 1 =
sn 60)

After a while it changes to

  wd0a: Error reading fsbn 48 of 48-51 (wd0 bn 92448 cn 97 tn 12 sn 27)

Okay, it has errors on offset 48 of both a and e partitions: any =
significance? Also, how do I convert bn,cn,tn,sn into an actual physical =
offset into the whole disk: maybe this will provide clues...

Philip, you seem to map a 64MB PCI space window into SDRAM, while we've =
only mapped 8MB: how do you choose 64MB, and do you see 8MB being a =
problem?

Thanks
 Bruce