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3.3.4 CSM Parameters
Boot Option Filter
Use this option to control what devices system can boot to. Coniguration options:
[UEFI and Legacy], [Legacy only] and [UEFI only].
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.