Adaptec RAID cards

[Michael Conlen]

I've got a Supermicro P4 Xeon server with an onboard Adaptec SCSI 
controller and a 0 channel RAID adapter with one array, plus a 2200S 
dual channel RAID controller with a second array.

FreeBSD 4.9 doesn't find any disks on the system at all. Neither the 
asr or aac drivers come up during boot. FreeBSD 5.1 does find both sets 
of disks. If I pull the 2200S and boot FreeBSD 4.9 the asr driver finds 
the 0 channel controller and array and installs fine. I've tried the 
2200S without the 0 channel adapter and neither disk controller driver 
loads.

Any idea why a 2200S would cause the kernel not to see either disk 
controller in 4.9 but work fine in semi recent versions of 5? In all 
instances the adapter BIOS loads and works properly.

--
Michael Conlen