ASRock C621A WS User Manual - Page 76

CSM Parameters

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3.6.1 CSM Parameters CSM Enable to launch the Compatibility Support Module. Please do not disable unless you're running a WHCK test. If you are using Windows Server 2012 R2 or later versions 64-bit UEFI and all of your devices support UEFI, you may also disable CSM for faster boot speed. 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. Select Do not launch to not execute both legacy and UEFI option ROM. PCIE1 Slot OpROM Use this item to select slot storage and Network Option ROM policy. In Auto option, the default is Disabled with NVMe device, but it is Legacy with other devices. (This item can't select Video Option ROM policy.) PCIE2/M2_1 Slot OpROM Use this item to select slot storage and Network Option ROM policy. In Auto option, the default is Disabled with NVMe device, but it is Legacy with other devices. (This item can't select Video Option ROM policy.) 70 English

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English
3.6.1
CSM Parameters
CSM
Enable to launch the Compatibility Support Module. Please do not disable unless
you’re running a WHCK test. If you are using Windows Server 2012 R2 or later ver-
sions 64-bit UEFI and all of your devices support UEFI, you may also disable CSM
for faster boot speed.
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. Select Do not launch to not execute both
legacy and UEFI option ROM.
PCIE1 Slot OpROM
Use this item to select slot storage and Network Option ROM policy. In Auto option, the
default is Disabled with NVMe device, but it is Legacy with other devices. (°is item can't
select Video Option ROM policy.)
PCIE2/M2_1 Slot OpROM
Use this item to select slot storage and Network Option ROM policy. In Auto option, the
default is Disabled with NVMe device, but it is Legacy with other devices. (°is item can't
select Video Option ROM policy.)