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3.1.2.16
CSM Configuration
Feature
CSM Support
Gate A20 Active
INT19 Trap Response
Boot option filter
Network
Storage
Video
Other PCI Devices
SOM-5871 User Manual
Options
Description
Disabled
Enable/disable CSM support.
Enabled
UPON REQUEST - GA20 can be disabled
Upon Request
using BIOS services. ALWAYS - do not allow
Always
disabling GA20; this option is useful when
any RT code is executed above 1MB.
BIOS reaction on INT19 trapping by Option
Immediate
ROM: IMMEDIATE - execute the trap right
Postponed
away; POSTPONED - execute the trap dur-
ing legacy boot.
UEFI and Legacy
This option controls Legacy/UEFI ROMs pri-
Legacy only
ority
UEFI only
Do not launch
Controls the execution of UEFI and Legacy
UEFI
PXE OpROM
Legacy
Do not launch
Controls the execution of UEFI and Legacy
UEFI
Storage OpROM
Legacy
Do not launch
Controls the execution of UEFI and Legacy
UEFI
Video OpROM
Legacy
Do not launch
Determines OpROM execution policy for
UEFI
devices other than Network, Storage, or
Legacy
Video
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