ASROCK IMB-185 User Manual page 36

CSM
Enable to launch the Compatibility Support Module. Please do not disable
unless you're running a WHCK test. If you are using Windows
and all of your devices support UEFI, you may also disable CSM for faster
boot speed.
Launch PXE OpROM Policy
Select UEFI only to run those that support UEFI option ROM only. Select
Legacy only to run those that support legacy option ROM only. Do not
launch?
Launch Storage OpROM Policy
Select UEFI only to run those that support UEFI option ROM only. Select
Legacy only to run those that support legacy option ROM only. Do not
launch?
Launch Video OpROM Policy
Select UEFI only to run those that support UEFI option ROM only. Select
Legacy only to run those that support legacy option ROM only. Do not
launch?
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