FreeBSD 6.1 installer doesn't recognize ICH5R RAID1

[Darren David]

hi all-

doing a clean install to 6.1, and i've decided to set up my system 
drives as RAID 1 now that I see that 6.1 has support for the ICH5R raid 
controller. My BIOS recognizes the SATA RAID 1 array correctly, but the 
FreeBSD installer still sees 'ad4' and 'ad6' as two separate drives. The 
installer has no problem with my 3ware 9500-based RAID5 array.

FWIW, ad4 and ad6 both have old installs of freebsd 5.4 on them, 
including bootloaders, not sure if that's causing some of the confusion 
here.

any thoughts?

thanks,
darren david