Advantech ASMB-925T2-00A1 User Manual page 57

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Legacy USB Support
This is for supporting USB device under a legacy OS such as DOS. When
choosing "Auto", the system will automatically detect if any USB device is
plugged into the computer and enable USB legacy mode when a USB device is
plugged, or disable USB legacy mode when no USB device is attached.
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XHCI Hand-off
This is a workaround for OS without XHCI hand-off support.
The XHCI ownership change should be claimed by XHCI driver.
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USB Mass Storage Driver Support
To "Disable or enable" USB mass storage driver support.
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USB Transfer Time-out
Selects the USB transfer time-out value. [1,5,10,20sec]
49 ASMB-925 User Manual