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CSM Support
Enable or disable CSM (Compatibility Support Module) configuration support.
When disabled, system can only support UEFI mode.
GateA20 Active
This items is useful when RT code is executed above 1MB. When it's set as
'Upon Request', GA20 can be disabled using BIOS services. When it's set as
'Always', it does not allow disabling of GA20.
Option ROM Messages
'Force BIOS' or 'Keep Current' to set the display mode for Option ROM.
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ASMB-586 User Manual
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