BIOS Setup
MB997
User’s Manual
57
4
4.4.11 CSM Configuration
BIOS Setting
Description
CSM Support
Enables / Disables CSM support.
Gate20 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.
HDD Connection
Order
Some OS require HDD handles to be adjusted,
i.e. OS isinstalled ondrive 80h.
Network
Controls the execution of UEFI and Legacy
PXE OpROM.
Options: Do not launch / Legacy
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