One of my older systems is equipped with a MSI K7N2G-ILSR mainboard. It's an NForce 2 board (AMD) with an onboard Promise RAID controller (Fasttrak 133 Lite or TX2+).
Today I was working on the system and I needed to reboot. I noticed while booting that the RAID controller's BIOS didn't show up (it always did so, even just an hour before).
I don't have a clue what happened. I cleared the systems BIOS, updated the BIOS (as the system BIOS includes the RAID BIOS) and it doesn't seem to work. Of course, the RAID controller is not seen by the OS (Linux).
I never had drives attached to the controller btw, but at boot, Linux did discover it. Now it doesn't do that anymore (tried dmesg and lspci to check).
It seems like my board has become a RAID-less board.