Adaptec AIC-7902 RAID

[merkurie at comcast.net]

I have a Gigabyte GA-8KNXP Ultra motherboard with an Adaptec AIC-7902 controller 
built in. When booting an installation CD without the RAID function on, the 
controller shows up in dmesg and detects the 2 hard drives like normal. If I 
enable the Adaptec RAID function, nothing is detected. I get these messages 
instead:

pci3: <mass storage, RAID> at device 10.0 (no driver attached)
pci3: (mass storage, RAID> at device 10.1 (no driver attached)

Does FreeBSD just not support this device, or do I have to load some kind of 
module?
Thanks for your time.

Marc