SCO defbootstr question for filePro server

[Larry Hoover]

This is more of a SCO Openserver question, but the continued existence 
of a filePro application depends on this server, and this forum has a 
lot of knowledge in SCO.

I have a customer running SCO Openserver 5.0.7 who has a fried 
motherboard, an Intel Server Board G7ESZ with two on-board SCSI 
channels, one a ultra160 and the other regular SCSI.  There is a cage 
with two IBM drives in RAID.  I replaced the mother board and it boots, 
but crashes when it tries to load SCO.  It gets to the host adapter part 
of the boot and reports an error:

  "no root disk controller was found.  A boottime loadable driver may be 
required.  dpti: HA0  Channel 0:  ID 1 2 3 4 ..   Panic Srmountfun error 
19 mounting rootdir 1/42"

I think the new motherboard is not compatible somehow with the SCSI 
drivers built into the boot string.  Channel A (ultra160) does not even 
find the operating system.  Channel B (regular SCSI) attempts to load 
but reports the error above.  The SCSI channels use different interrupts 
than the old one did, but there is no way to change this.

Any ideas such as defboostr's to try?

Thanks in advance,
Larry Hoover