Advantech ARK-5261 User Manual page 53

3.2.2.13 CSM configuration
Compatibility Support Module Configuration:
 CSM Support
This item allows users to enable or 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
This item allows users to set the display mode for Option ROM.
INT19 Trap Response

This item allows users to set the BIOS reaction to INT19 trapping by Option.
ROM: "Immediate" - execute the trap right away; "postponed" - execute the trap
during legacy boot.
 Boot Options Filter
This item allows users to control the Legacy/UEFI ROM priority.
 Option ROM Execution
– Network
Controls the execution of UEFI and Legacy PXE OpROM.
– Storage
Controls the execution of UEFI and Legacy Storage OpROM.
– Video
Controls the execution of UEFI and Legacy Video OpROM.
– Other PCI devices
Determines the OpROM execution policy for devices other than network,
storage, and/or video devices.
Figure 3.15 CSM Configuration
45 ARK-5261 User Manual