Chapter 4: BIOS Setup
53
On Advanced Setup screen, select and enter “CSM Configuration Settings”
Item
Option
Description
CSM Support
Disabled
Enabled
Enable/Disable CSM Support
GateA20 Active
Upon
Request
Always
UPON REQUEST - GA20 can be disabled using BIOS services.
ALWAYS - do not allow disabling GA20; this option is useful
when any RT code is executed above 1MB.
Option ROM
Messages
Force BIOS
Keep
Current
Set display mode for Option ROM
INT19 Trap
Response
Immediate
Postponed
BIOS reaction on INT19 trapping by Option ROM: IMMEDIATE
- execute the trap right away; POSTPONED - execute the trap
during legacy boot.
Network
Do Not
Launch
UEFI
Legacy
Controls the execution of UEFI and Legacy PXE
OpROM
Storage
Do Not
Launch
UEFI
Controls the execution of UEFI and Legacy Storage
OpROM