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3.3.9 CSM Configuration
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CSM Support
This item allows you to enable or disable CSM support.
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GateA20 Active
This item allows you to select <Upon Request> or <Always>.
Upon Request: GA20 can be disabled using BIOS services.
Always: Do not allow GA20 disabling. This option is useful when any RT code is executed above
1MB.
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Option ROM Messages
This item allows you to select <Force BIOS> or <Keep Current>.
Force BIOS : The third-party ROM messages will be forced to display during the boot sequence.
Keep Current : The third-party ROM messages will be displayed only if the third-party
manufactured had set the add-on device to do so.
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INT19 Trap Response
BIOS reaction on INT19 trapping by Option ROM: Immediate - execute the trap right away;
Postponed - execute the trap during legacy boot.
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Boot option filter
This item allows you to select which type of operating system to boot.
UEFI and Legacy: Allows booting from operating systems that support legacy option ROM or UEFI
option ROM.
Legacy only: Allows booting from operating systems that only support legacy option ROM.
UEFI only: Allows booting from operating systems that only support UEFI option ROM.
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PXE Function
This item controls the execution of UEFI and PXE option ROM. Select <Do not launch>, <UEFI> or
<Legacy>.
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Storage
This setting allows you to select whether to enable the UEFI or legacy option ROM for the storage
device controller. Select <Do not launch>, <UEFI> or <Legacy>.
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Video
This setting allows you to select whether to enable the UEFI or legacy video option ROM for the
video device controller. Select <Do not launch>, <UEFI> or <Legacy>.
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Other PCI devices
This item determines option ROM execution policy for devices other than Network, storage or
video. Select <Do not launch>, <UEFI> or <Legacy>.
Chapter 4: BIOS Setup
Rugged E3 l User’s Manual
