Thanks to rs8888 and rbmorse!
I saw a mention of RAID support on the Secondary SATA controller in a third party review of the motherboard. Seeing the Marvell driver download on the intel site labeled as "RAID: Marvell* SATA Driver" led me to believe that it might work.
In any event, I have settled for a Win 7 mirrored volume on the secondary SATA controller. I'm using an Intel 520 SSD as a system drive and two WD 1TB SATA III hard drives for the mirror. I tested using the secondary Marvell controller for the SSD -- thinking that I could then setup the RAID volume using the chipset controller. However, according to HD Tune the SSD access was less than half the speed when attached to the secondary controller rather than the primary.
Thanks again for the help.