User Manual
Page 64
... execute both legacy and UEFI option ROM. Select Legacy only to run those that support UEFI option ROM only. Disable for faster boot speed. Launch Video OpROM Policy Select UEFI only to run those that support legacy option ROM only. Launch PXE OpROM Policy Select UEFI only to see the AddOn... ROM messages or configure the AddOn ROM if you 're running a WHCK test. Select Do not launch to launch the Compatibility Support Module. AB350M-HDV/A320M-HDV/A320M-DGS AddOn ROM Display Enable AddOn ROM Display to run those that support UEFI option ROM only.
... execute both legacy and UEFI option ROM. Select Legacy only to run those that support UEFI option ROM only. Disable for faster boot speed. Launch Video OpROM Policy Select UEFI only to run those that support legacy option ROM only. Launch PXE OpROM Policy Select UEFI only to see the AddOn... ROM messages or configure the AddOn ROM if you 're running a WHCK test. Select Do not launch to launch the Compatibility Support Module. AB350M-HDV/A320M-HDV/A320M-DGS AddOn ROM Display Enable AddOn ROM Display to run those that support UEFI option ROM only.