IBASE SI-18 - Manual (Page 30)

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USB Configuration
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.
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.
USB transfer time-out
The time-out value for Control, Bulk, and Interrupt transfers.
Device reset time-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’ users default value: for a Root port it is 100ms, for a Hub port the
delay is taken from Hub descriptor.