xd0 not recognized by SunOS 4.1

[V. Krishna]

We have just finished installing SunOS 4.1 on a SUN 3/180 server (which
was running on 4.0.3 earlier). 

The problem: the disk-controller xd (Xylogics 753) is not recognized by
the system at all. All we see during boot up is the XYc0 (Xylogics 450)
and the Fujitsu Eagle 450 MB disk drive it supports. We have had the Xd
controller with two CDC 9750-1230 Sabre drives on the system, working well
for a couple of months now (with SunOS 4.0.3), but don't see why the
device does'nt get registered during bootup.  In fact, we tried >b
xt()install xd(0,0,1) (at the start of installation) in order to load the
system on the xd0 disk, but NO, it would'nt do that.  ('Could not open
xd(0,0,1)').

We suspected that there may be something missing in the EEPROM and upon
examination of its contents, found that there was no entry for xd. There
are entries for xt xy fpa and the cpu board.

My question therefore is: How to get the system to recognize the xd ? Is
it at all possible to use the CDC 9720-1230 Sabre drive as the system
disk? (SUN does not support configuring a CDC 9720-1230 on the 753/7053
contr- oller).  Any clues, ideas, suggestions ?  Would appreciate hearing
from you.

                           Thanks
                                  Krishna
                     (email address: 
                            krishna at ssvs.gsfc.nasa.gov