From what I remember, this is a harmless message. You either don't have a drive plugged into the built-in RAID controller on the motherboard, if it has one, or you don't have a drive plugged into a RAID controller plug-in card, if one is installed. In either case, it recognizes that the extra BIOS code is therefore not required, and it's just letting you know that it's not doing anything. I don't think this message is hurting anything at all.
Cheers and Regards.