IBASE SI-64 - Manual (Page 41)

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Legacy USB Support
Enables Legacy USB support.
AUTO option disables legacy support if no USB devices are connected.
DISABLE option will keep USB devices available only for EFI applications.
USB3.0 Support
Enable/Disable USB3.0 (XHCI) Controller support.
XHCI Hand-off
This is a workaround for OSes without XHCI hand-off support. The XHCI ownership change
should be claimed by XHCI driver.
EHCI Hand-off
Enabled/Disabled. This is a workaround for OSes without EHCI hand-off support. The EHCI
ownership change should be claimed by EHCI driver.
Port 64/60 Emulation
Enables I/O port 60h/64h emulation support. This should be enabled for the complete USB
keyboard legacy support for non-USB aware OSes.
USB Transfer time-out
The time-out value for Control, Bulk, and Interrupt transfers.
Device reset tine-out
USB mass Storage device start Unit command time-out.
Device power-up delay
Maximum time the device will take before it properly reports itself to the Host Controller.
‘Auto’ uses default value: for a Root port it is 100ms, for a Hub port the delay is taken from
Hub descriptor.