FreeBSD 4.7 - 4.10 SCSI and IDE RAID

[Andrew Karjagin]

Hello!
I have a machine with SCSI disk on Tekram 395U3W (as da0) and two IDE disks on Fasttrak-2000 RAID (as ar0).
When I install FreeBSD 4.7 or 4.10 RELEASE with root partition on SCSI disk and reboot, then system say me:

invalid partition
boot: 0:ad(0,a)/kernel

and doesn't booting. When I set: 
boot: 1:da(0,a)/kernel

system booted successfully. What can I do to automate the process of booting?
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