58
9.3.5 USB
Feature
Options
Description
USB Info
only
USB Module Version
Info only
USB Devices
Info only
X drive, x keyboards, x mouse, x 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 max storage device.
