Asus ROG STRIX X299-XE GAMING, Manual

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Chapter 3: BIOS Setup
Chapter 3
CSM (Compatibility Support Module)
This item allows you to configure the CSM (Compatibility Support Module) items to fully
support the various VGA, bootable devices and add-on devices for better compatibility.
Launch CSM
[Auto] The system automatically detects the bootable devices and the add-
on devices.
[Enabled] For better compatibility, enable the CSM to fully support the non-UEFI
driver add-on devices or the Windows
®
UEFI mode.
[Disabled] Disable the CSM to fully support the non-UEFI driver add-on devices
or the Windows
®
UEFI mode.
The following items appear only when you set the Launch CSM to [Enabled] .
Boot Devices Control
This item allows you to select the type of devices that you want to boot.
Configuration options: [UEFI and Legacy OPROM] [Legacy OPROM only]
[UEFI only]
Boot from Network Devices
This item allows you to select the type of network devices that you want to
launch.
Configuration options: [Ignore] [Legacy only] [UEFI driver first]
Boot from Storage Devices
This item allows you to select the type of storage devices that you want to
launch.
Configuration options: [Ignore] [Legacy only] [UEFI driver first]
Boot from PCI-E/PCI Expansion Devices
This item allows you to select the type of PCI-E/PCI expansion devices that
you want to launch.
Configuration options: [Legacy only] [UEFI driver first]
Secure Boot
This item allows you to configure the Windows
®
Secure Boot settings and manage its keys to
protect the system from unauthorized access and malwares during POST.