Advantech ARK-2121S, User Manual

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ARK-2121S User Manual 44
5.2.3.4 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.

XHCI Hand-off
This is a workaround for OSes without XHCI hand-off support. The XHCI owner-
ship change should be claimed by XHCI driver.

EHCI Hand-Off
This is a workaround for OSes without EHCI hand-off support. The EHCI owner-
ship change should claim by EHCI driver.

USB Mass Storage Driver Support
Enable/Disable USB Mass Storage Driver Support.

USB transfer time-out
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' uses default value: for a Root port it is 100 ms, for a Hub port
the delay is taken from Hub descriptor.