Advantech MIC-3399 User Manual page 36

2.3.2.3 USB Configuration
USB Support

This item allows users to configure the USB support parameters.
Legacy USB support

This item allows users to enable/disable legacy USB support. The auto option
disables legacy support if no USB devices are connected. The disable option
will keep USB devices available only for EFI applications. The default setting is
enabled.
EHCI Hand-Off

This is a workaround for operating systems without EHCI hand-off support. Any
EHCI ownership changes should be conducted by the EHCI driver.
Port 60/64 Emulation

This item allows users to enable/disable support for I/O port 60h/64h emulation.
This should be enabled for complete USB keyboard legacy support for non-USB
aware operating systems.
MIC-3399 User Manual
Figure 2.7 USB Configuration
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