Well, my setup is a bit different, but the same Sata chipset.
I put the boot order to CDRom, HDD, then SCSI, then floppy.
I booted off the CDRom and in the BIOS screens, entered the Sata Raid setup, setup RAID0 and then it booted off the CD and installed the drivers off the floppy when pressed F6 to specify them...I specified the Sata drivers 2 times...just in case..