User Manual

Chapter 5: BIOS Setup
5-22
5.5.12 CSM (Compatibility Support Module)
Launch CSM [Disabled]
Allows you to enable or disable CSM (Compatibility Support Module) Support.
[Enabled] For a better compatibility, enable the CSM to fully support the non-UEFI
driver add-on devices or the Windows UEFI mode.
[Disabled] Disable the CSM to fully support the Windows secure update and secure
boot.
The following items appear only when
Launch CSM
is set to
[Enabled]
.
GateA20 Active [Upon Request]
Allows you to set the GA20 option.
[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.
Option ROM Messages [Force BIOS]
This allows you to set the display mode for option ROM.
Conguration options: [Force BIOS] [Keep Current]
Interrupt 19 Capture [Immediate]
Allows you to select the BIOS reaction on INT19 trapping by Option ROM.
[Immediate] Execute the trap right away.
[Postponed] Execute the trap during legacy boot.
[Auto] Auto
HDD Connection Order [Adjust]
Allows you to select the HDD Connection Order. Some OS require HDD handles to be
adjusted, i.e. OS is installed on drive 80h.
Conguration options: [Adjust] [Keep]
Boot Device Control [UEFI and Legacy]
Allows you to select the devices boot-up mode according to the devices specication.
Devices with the selected mode will in the boot priority list.
Conguration options: [UEFI and Legacy] [Legacy only] [UEFI only]
Option ROM execution
Boot from Network Devices [UEFI only]
Allows you to select the type of onboard LAN controller and installed LAN cards.
Network devices will run the selected type during the system boot. Selecting
[Ignore]
will accelerate the boot up time without running network devices during POST (Power-On
Self-Test).
Conguration options: [Ignore] [UEFI only] [Legacy only]