Kontron mITX-BDW-U, User Manual

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mITX-BDW-U – User Guide, Rev. 1.6
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South Bridge Configuration > SB USB Configuration
Function Selection Description
USB Precondition Disabled
Enabled Precondition work on USB host controller and root
ports for faster enumeration.
xHCI Mode Disabled
Enabled
Auto (note 1)
Smart Auto (note 2) Mode of operation of xHCI controller.
USB Per-Port Disable Control Disabled
Enabled Control each of the USB ports (0~13) enable/disable.
“Auto”. This mode uses ACPI protocol to provide an option that enables the xHCI controller to
reroute USB ports via the _OSC ACPI method call. Note, this mode switch requires special OS
driver support for USB 3.0.
“Smart Auto”. This mode is similar to “Auto”, but it adds the capability to route the ports to
xHCI or EHCI according to setting used in previous boots (for non-G3 boot) in the pre-boot
environment. This allows the use of USB 3.0 devices prior to OS boot. Note, this mode switch
requires special OS driver support for USB 3.0 and USB 3.0 software available in the pre-
boot environment.