ASRock X370M User Manual - Page 72
Fast Boot, CSM Compatibility Support Module, Above 4G Decoding, Launch PXE OpROM Policy, Launch
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Fast Boot Fast Boot minimizes your computer's boot time. In fast mode you may not boot from an USB storage device. CSM (Compatibility Support Module) CSM Enable to launch the Compatibility Support Module. Please do not disable unless you're running a WHCK test. Above 4G Decoding Enable or disable 64bit capable Devices to be decoded in Above 4G Address Space (only if the system supports 64 bit PCI decoding). 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. 66 English