Asus Maximus VI Extreme Manual page 138

Option ROM Messages [Force BIOS]
[Force BIOS]
[Keep Current]
Interrupt 19 Capture [Enabled]
When set to [Enabled], allows the option ROMs to trap Interrupt 19.
Configuration options: [Enabled] [Disabled]
Setup Mode [Advanced Mode]
[Advanced Mode]
[EZ Mode]
CSM (Compatibility Support Module)
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]
[Auto]
[Enabled]
[Disabled]
The following items appear when you set the Launch CSM to [Enabled].
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The third-party ROM messages will be forced to display during the boot
sequence.
The third-party ROM messages will be displayed only if the third-party
manufacturer had set the add-on device to do so.
Sets Advanced Mode as the default screen for entering the BIOS
setup program.
Sets EZ Mode as the default screen for entering the BIOS setup
program.
The system automatically detects the bootable devices and the add-
on devices.
For better compatibility, enable the CSM to fully support the non-UEFI
driver add-on devices or the Windows
Disable the CSM to fully support the non-UEFI driver add-on devices
or the Windows UEFI mode.
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Boot Device Control [UEFI and Legacy OpROM]
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 [Legacy OpROM first]
Allows you to select the type of network devices that you want to launch.
Configuration options: [Legacy OpROM first] [UEFI driver first] [Ignore]
Boot from Storage Devices [Legacy OpROM first]
Allows you to select the type of storage devices that you want to launch.
Configuration options: [Both, Legacy OpROM first] [Both, UEFI first]
[Legacy OpROM first] [UEFI driver first] [Ignore]
Boot from PCIe/PCI Expansion Devices [Legacy OpROM first]
Allows you to select the type of PCIe/PCI expansion devices that you want
to launch.
Configuration options: [Legacy OpROM first] [UEFI driver first]
UEFI mode.
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Chapter 3: BIOS setup