Problem with motherboard se7505VB2(onboard SATA RAID Sil 3112A) and FreeBSD 5.1

[Anton Savoschik]

Hello!
I can't install FreeBSD 5.1(4.8) on Intel motherboard SE7505VB2 with
onboard Sil 3112A SATA Raid, also I can't find any information in
Hardware Notes for FreeBSD 5.1(4.8). Then SATA RAID disabled all works
fine(then I use ATA harddisk). In my opinion, it's a problem with Sil 3112A SATA
Raid. What can I do? Please help.