User guide

Quick Reference Guide
EMS-BYT Series Quick Reference Guide
65
Boot option filter
UEFI and Legacy
Legacy only[Default]
UEFI only
This option controls Legacy/UEFI ROMs
priority.
Network
Do not launch[Default]
UEFI only
Legacy only
Controls the execution of UEFI and Legacy
PXE OpROM.
Storage
Do not launch
UEFI only
Legacy only[Default]
Controls the execution of UEFI and Legacy
Storage OpROM.
Video
Do not launch
UEFI only
Legacy only[Default]
Controls the execution of UEFI and Legacy
Video OpROM.
Other PCI devices
UEFI only
Legacy only[Default],
Determines OpROM execution policy for
devices other than Network, Storage, or
Video.
3.6.2.10 CSM Configuration
Item
Options
Description
CSM Support
Enabled[Default]
Disabled,
Enable/Disable CSM Support.
GateA20 Active
Upon Request[Default]
Always
UPON REQUEST – GA20 can be disabled
using BIOS services. ALWAYS – go not
allow disabling GA20; this option is useful
when any RT code is executed above 1MB.
Option ROM Messages
Force BIOS[Default]
Keep Current
Set display mode for Option ROM.
INT19 Trap Response
Immediate[Default]
Postponed
BIOS reaction on INT19 trapping by Option
ROM: IMMEDIATE – execute the trap right
away; POSTPONED – execute the traps
during legacy boot.