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4.4.8
CSM Configuration
CSM Support [Enabled]
This option allows you to enable or disable CSM Support.
Configuration options: [Disabled] [Enabled]
The following items appear only when you set the CSM Support to [Enabled].
GateA20 Active [Upon Request]
This allows you to set the GA20 option.
[Upon Request] GA20 can be disabled using BIOS services.
[Always]
Option ROM Messages [Force BIOS]
This allows you to set the display mode for option ROM.
Configuration options: [Force BIOS] [Keep Current]
INT19 Trap Response [Immediate]
This option allows you to control the BIOS reaction on INT19 trapping by Option ROM.
[Immediate]
[Postponed]
Boot Option filter [Legacy only]
This option allows you to control the Legacy/UEFI ROMs priority.
Configuration options: [UEFI and Legacy] [Legacy only] [UEFI only]
Network / Storage / Video [Legacy]
This option allows you to control the execution of UEFI and Legacy PXE/ Storage/ Video
OpROM.
Configuration options: [UEFI ] [Legacy]
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D o not allow disabling GA20; this option is useful when any RT code is
executed above 1MB.
Execute the trap right away.
Execute the trap during legacy boot.
Chapter 4: BIOS Setup
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