I have a server with a SuperMicro X8SIL-V motherboard. Here's the manual. Every time it boots, it spends about three minutes at this screen:
Sil 3124 SATARaid BIOS Version 6.3.18
Copyright (C) 1997-2006 Silicon Image, Inc.
Press (Ctrl+S) or F4 to enter RAID utility
After that it beeps once and then boots normally.
I have multiple HBA expansion cards in it, but none are hooked up to any drives at the moment. The only drive is a 120GB ssd with a base install of Arch Linux.