Advantech ITA-5831 Series User Manual page 47

4.3.1.9 CSM Configuration
 CSM Support
Enable/disable CSM support. The default setting is [Enabled].
 GateA20 Active
[Upon Request]: GA20 can be disabled using BIOS services.
[Always]: Do not allow disabling GA20.
 Option ROM Messages
Set the display mode for option ROM.
INT19 Trap Response

BIOS reaction on INT19 trapping by option rom.
[Immediate]: execute the trap right way
[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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