Intel KM4AM - Manual (Page 62)

VIA VT8237 Serial ATA RAID Introduction
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BIOS Configuration
When the system powers on during the POST (Power-On Self Test) process, press
<Tab> key to enter the BIOS configuration.
The Serial ATA RAID volume may be configured using the VIA Tech. RAID BIOS.
Always use the arrow keys to navigate the main menu, use up and down arrow key
to select the each item and press <Enter> to call out the list of creation steps. The
main interface of BIOS configuration utility is as below: