Advantech EPC-C301 Series User Manual page 58

3.1.2.12 CSM Configuration
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.
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.
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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