ASRock B550M/ac User Manual - Page 85
CSM Compatibility Support Module, Launch PXE OpROM Policy, Launch Storage OpROM Policy, Bootup Num-
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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. Bootup Num-Lock Select whether Num Lock should be turned on or off when the system boots up. Full Screen Logo Enable to display the boot logo or disable to show normal POST messages. 78 English