Advantech MIO-5850 User Manual page 34

UPON REQUEST - GA20 can be disabled using BIOS services. Do not allow
disabling of GA20; this option is useful when any RT code is executed above
1MB.

Option ROM Messages
Set display mode for Option ROM.

Boot option filter
This option controls Legacy/UEFI ROM priority.

Network
Controls the execution of UEFI and Legacy PXE OpROM.

Storage
Controls the execution of UEFI and Legacy Storage OpROM.

Video
Controls the execution of UEFI and Legacy Video OpROM.

Other PCI devices
Determines OpROM execution policy for devices other than Network, Storage,
or Video.
3.1.2.11 SDIO Configuration

SDIO Access Mode
Auto Option: Access SD device in DMA mode if controller supports it, otherwise
in PIO mode.
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