RAID1 works in d-i using Asus XpertDrive BIOS util
I've used the Asus' XpertDrive BIOS utility to enable hardware RAID1 instead of Intel Matrix Storage (= software RAID) and now d-i reconises the RAID of to physical disks as one volume, so I can install staight to RAID1.
Originally Posted by rvdnberg
There was a problem with using the IDE ports on the marvell chip in AHCI mode that was fixed in kernel 2.6.26-12. I had to set the storage operation mode (in bios) back to default to be able to use my IDE cdrom to install in the first place.
Once I had a recent kernel going I switched to AHCI mode.
Btw I did stumble upon a link with a workaround for the pata_marvell/achi issue: http://duncanelliot.com/blog/?p=18 which does contain a second link to how to install debian from a usb flask disk.