Csm Configuration - IBASE Technology ET875 Series User Manual

4.4.9

CSM Configuration

BIOS Setting
CSM Support
GateA20 Active
INT19 Trap
Response
Boot option filter
Network
32
Description
Enables / Disables CSM support.
•
Upon Request disables GA20 when using BIOS
services.
•
Always cannot disable GA20, but is useful when
any RT code is executed above 1 MB.
Selects the way that BIOS reacts on INT19 trapping by
Option ROM.
•
Immediate executes the trap right away
•
Postponed executes the trap during legacy boot.
Controls the priority of Legacy and UEFI.
Controls the execution of UEFI and Legacy PXE
OpROM.
ET875 Series User's Manual