ADLINK Technology COM Express cExpress-BT2, User Manual

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BIOS Setup
7.3.5. USB
Feature Options Description
USB Info only
USB Module Version Info only
USB Devices Info only Drives, keyboards, mouse, hubs
Legacy USB Support Enabled
Disabled
Auto
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 and setup.
XHCI Hand-off
Enabled
Disabled
This is a workaround for OSes without XHCI hand-off
support. The XHCI ownership change should be
claimed by the XHCI OS 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 the EHCI OS driver.
USB Mass Storage Driver Support Enabled
Disabled
Enable/Disable USB mass storage driver support.
Chipset USB Configuration Submenu
USB hardware delays and time-outs: Info only
USB transfer time-out 1 sec
5 sec
10 sec
20 sec
The time-out value for control, bulk, and interrupt
transfers
Device reset time-out 10 sec
20 sec
30 sec
40 sec
USB mass storage device Start Unit command time-out.
Device power-up delay Auto
Manual
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.
Mass Storage Devices Info only List current USB mass storage devices.