stored at a different location in the PCI space, so adjust accordingly.
Also, when using more than two smart controllers in one machine, the
disks were assigned the wrong drive number; fix this as well.
Change disk names to `idad' to avoid naming conflicts with the controller,
and enable the new disk code to pick up the drives.
Tested by: david.w.james@bt.com (existing compaq support)
Reviewed by: msmith
Approved by: jordan
