Installing on a machine with nvidia RAID

[David Goodenough <david.goodenough@btconnect.com>]

I have a machine (a Tyan GT24) with two SATA disks, both of which are in 
raid mirror.  

Without the RAID setup, the current etch beta installs fine.

With RAID however neither GRUB nor LILO seem to like the disks.

Grub says it installed to (hd0), but when you boot it clears the screen 
and just says "GRUB " at the top left and hangs.

Lilo will not install, it offers /dev/sdb, /dev/sda1 and other as locations
to install itself (note not /dev/sda) and fails on both the specific ones and
also of you choose other on /dev/sda.

The only HOWTOs on installing Linux on an nVidia RAID system seem to
be for Gentoo, and rather ominously talk about requiring a custom
kernel.  

Does anyone know how to install such a machine?

David