Two dual-channel scsi controllers on S10 8/07 x86?

I'm attempting an install of Solaris 10 8/07 x86 on a server with four channels of scsi devices. The problem is that the install procedure only recognises the controller on the motherboard, and not the additional controller on the pci bus with the boot disk.
The motherboard is a Supermicro X7DB8+ with integrated Adaptec AIC-7902 (dual U320), and the additional controller is an Adaptec 39320A (dual U320) installed in PCI-X slot 3. The scsi bios gives the following display:
AIC-7902 A at slot 07 04:02:00
AIC-7902 B at slot 07 04:02:01
39320A A at slot 03 07:01:00
39320A B at slot 03 07:01:01
The controller master is set to the 39320A, and the system disk (id 0 on 39320A channel A) is enabled as a bootable device on the motherboard bios. Everything appears fine at both the scsi and motherboard bios levels - all drives are visible and all diagnostics work as expected.
However, trying all permutations and combinations I can think of, the S10 installation routine persists in only recognising the drives on AIC-7902 channels A and B (as c0xxxxxx and c1xxxxxx). I cannot see the drives on the 39320A nor enable any of them as a boot disk for installation as desired.
Any one with any ideas? I'm stumped now.

Thanks for the tip! I was sure I disabled HostRaid, but apparently it was not disabled on the 39320A. Everything works as expected now.
Regards,
Adam.

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Quote
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