IBT Technologies MI979 Series, User Manual

Page: 69 / 87

BIOS Setup
MI979 Series
User’s Manual
61
4
4.4.9 USB Configuration
BIOS Setting Description
Legacy USB Support
•
Enabled enables Legacy USB support.
•
Auto disables legacy support if there is no
USB device connected.
•
Disabled keeps USB devices available only
for EFI applications.
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 This is a workaround for OSes without XHCI
hand-off support. The EHCI ownership change
should be claimed by EHCI driver.
USB Mass Storage
Driver Support Enables / Disables the support for USB mass
storage driver.
USB Transfer
time-out The time-out value (1 / 5 10 / 20 secs) for Control,
Bulk, and Interrupt transfers.
Device reset time-out Gives seconds (10 / 20 / 30 / 40 secs) to delay
execution of Start Unit command to USB mass
storage device.
Device power-up
delay The 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. But for a Hub port, the delay is taken from
Hub descriptor.