No, you can't load the binary drivers afterwards if the Silicon Image people didn't make the driver for that kernel(OS). They have the drivers available on their website to an extent.
To skip this problem entirely and be cured for life, get this for 128 bucks.
What? Money? Yes, and trust me it's worth every penny if you never ever have to jack around with software RAID again. Kernel native, fully supported, bootable 0 or 1 or 0+1 or 5, depending on how many ports. And you don't have to do anything but set the cards bios.
This may sound like a cheap shot, but it's the right answer. If you want to make this chipset work, then you have to follow the instructions of not setting the RAID on the chipset, and using linux's software RAID after the installation. And after you do all that, my guess is you'll be tickled pink to get a card you'll never have to screw with again.