ASROCK D1540D4U-2L+ - CSM Configuration

D1540D4U Series
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3.3.4 CSM Conguration
Boot Option Filter
is option controls Legacy/UEFI ROMs priority.
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. Select Do not launch to not
execute both legacy and UEFI option ROM.
PCIE4 Slot OpROM
Use this item to select PCIE4 Option ROM policy.
PCIE6 Slot OpROM
Use this item to select PCIE6 Option ROM policy.