SCSI AIC7902 Boot Issue

[ChrisC]

   I am attempting to install FreeBSD 5.3 onto a new server, but during
   the initial bootup it fails / times out from what I think is it trying
   to initialize the SCSI adapter. The server has an Adaptec AIC-7902
   dual-channel Ultra320 SCSI controller which the i386 ahd(4) driver has
   listed as a supported device.
   I have been reading and searching this lists archives as well as the
   bsdforums.org site for possible solutions, but so far what I have
   found has not worked. I have tried disabling/enabling ACPI, removing
   all but one SCSI drive and re-checking the adapter settings comparing
   them to a different Adaptec controller on another server running
   FreeBSD 5.3 which works fine. The servers BIOS and firmware is all up
   to date and is mainly running on its default settings.
   Here is a summary of what I am seeing during bootup:
   Ata1-master : FAILURE ATAPI_IDENTIFY timed out
   Waiting 15 seconds for SCSI devices to settle
   -------Dump Card State Ends-------
   (probe29:ahd1:0:15:0) SCB0xe timed out
   ahd0: Issued Channel A Bus Reset 4 SCBs aborted
   Any ideas?