I am seeing similar behaviour on a Dell R410 with Perc 6/i RAID controller. I have used the daily d-i build over PXE - it is using kernel 2.6.29-2-amd64.
The install progresses fine until the "Detect Disks" part comes along. It then claims it cannot find the disks. However, if I break out into a shell and have a look, I can see in the dmesg output that the device is working. I have even been able to use fdisk to partition the disk and tried cheating by manualling partitioning, mkfs-ing and mounting the disk on /target. The mptsas driver appears to be talking to the controller just fine. Sadly, I can't copy and paste output from this box. If there's a way to convince the installer that I have partitioned and mounted the disks and let me carry on, that would get past the immediate problem. I am quite happy to try other things out if you need more information back. Andrew -- To UNSUBSCRIBE, email to debian-boot-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org