Can't boot from Adaptec 2010s

Hello all,
I successfully installed my linux (Debian with a 2.4.24 vanilla kernel)
on my Fujitsu Siemens Primergy TX200 server containing a 2010s (Raid 1).

The only problem i have is that I can't boot from my raid. When I boot
from bootdisks the raid works fine!
My bootloader is lilo. The bootpartition on my disks has a ext3 filesystem.
When I boot the machine I can't see nothing from lilo, the machine just
hangs.
(The PhoenixBios recognizes 'I2O OSM' as a HardDrive)

What could be the problem?

Thanx for answering
valli