Advantech MIO-3260 User Manual page 38

3.2.2.10 CSM configuration
 CSM Support
Enable/Disable CSM support.
GateA20 Active

Upon Request - GA20 can be disabled using BIOS services otherwise GA20
cannot be disabled; 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.
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 OpROM execution policy for devices other than Network, Storage,
or Video.
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