Advantech AIMB-231 User Manual page 55

3.2.2.12 CSM Configuration
 Compatibility Support Module Configuration
Enabled or disabled CSM support.
 GateA20 Active
UPON REQUEST - GA20 can be disabled using BIOS services. Never allow
disabling of GA20; this option is useful when any RT code is executed above 1
MB.
 Option ROM Messages
Set display mode for Option ROM.
Boot option filter

This option controls Legacy/UEFI ROM priority.
 Option ROM execution
– Storage
Controls the execution of UEFI and Legacy Storage OpROM.
– Video
Controls the execution of UEFI and Legacy Video OpROM.
– Other PCI devices
Determines OpROM execution policy for devices other than Network, Stor-
age, or Video.
43 AIMB-231 User Manual