ASROCK X399 Phantom Gaming 6 User Manual page 102

AddOn ROM Display
Enable AddOn ROM Display to see the AddOn ROM messages or configure the AddOn
ROM if you've enabled Full Screen Logo. Disable for faster boot speed.
Above 4G Decoding
Enable/disable the 64-bit capable devices to be decoded in above 4G address space.
*The function is only applied to system that supports 64-bit PCI decoding.
CSM (Compatibility Support Module)
CSM
Enable to launch the Compatibility Support Module. Please do not disable unless
you're running a WHCK test.
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. Select Do not launch to not
execute both legacy and UEFI option ROM.
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.
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