I drove myself nuts on this one over the past few weeks. I have multiple cards all based on the SiI3132 but could never get them to work with my various Intel boards. I figured out over the weekend that the BIOS RAID utility by Silicon Image is considered by the motherboard to be expansion card text.
To get access to the SiI3132 BIOS RAID Utility from an Intel Desktop Board:
1) During boot, enter the BIOS setup by pressing F2
2) Select the "Security" tab at the top
3) Select "Expansion Card Text" and set <Enable>
4) Save changes and exit
The latest Intel BIOS for your board may be required for all options to work properly.