Vecow EMBC-1000 User Manual page 62

4.3.13 CSM Configuration
Figure 4-3-13 : CSM Settings
Network Stack
Enable/disable UEFI Network Stack.
CSM Support
Enable/disable CSM Support.
GateA20 Active
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
Set display mode for Option ROM.
INT19 Trap Response
BIOS reaction on INT19 trapping by Option ROM:
IMMEDIATE - execute the trap right away;
POSTPONED - execute the trap during legacy boot.
Boot option filter
This option controls Legacy/UEFI ROMs priority.
Network
Controls the execution of UEFI and Legacy PXE OpROM.
BIOS SETTING 55