I don't know if this will work for any other board I have an Abit AN8-ultra
This doesn't work with latest medevil driver but with the one from Zeph's 10.5.1
Installed inside IOATA kext "don't know if this makes a difference"

Don't turn off any ide or sata in bios
Do change from auto to none under each device in bios that does not have a device attached

Result = No waiting instantly boots into OS