Problems with FreeBSD on Poweredge 6300

Hi !

Our mother company donated us some used Dells (Poweredge 6300). Recently we
started to move away from Redhat in favor of FreeBSD, so naturally I tried
to install the FreeBSD on them, but the istallation process dies at:

> Waiting 15 seconds for SCSI devices to settle
> amrd0: <LSILogic MegaRAID logical drive> on amr0
> amrd0: 25706 MB (52641792 sectors) RAID5 (optional)
> GEOM: create disk amrd0 db=0xc6fa528c
> md0: Preloading image </boot/mfsroot> 442360 bytes at 0xc09dff74

Doing verbose boot reveals a little more information:

> (probe50:ahc2:0:5:0): error 22
> (probe50:ahc2:0:5:0): Unretryable error
> (ahc2:A:5:0): Sending SDTR period c, offset f
> (ahc2:A:5:0): Received SDTR period c, offset f
>    Filtered to period c, offset f
> ahc2: target 5 synchronous at 20.0MHz, offset = 0xf
> (ahc2:A:5:0): Sending SDTR period c, offset f
> (ahc2:A:5:0): Received SDTR period c, offset f
>    Filtered to period c, offset f

I also tried booting Redhat 9.0 and it works fine. Is there any hope for me
getting this work, or should I just relax and go back to Linux ?   :-(

Best Regards
Nils Berzins

P.S. Servers are Poweredge 6300 with 4xPIII Xeon 550MHz, 1GB RAM and AMI
PERC2/SC RAID.