DFI CR902-B - Manual (Page 36)

www.dfi .com Chapter 4 BIOS Setup
36
Chapter 4
USB Configuration
This section is used to configure USB.
Legacy USB Support
Enabled
Enables legacy USB.
Auto
Disables support for legacy when no USB devices are connected.
Disabled
Keeps USB devices available only for EFI applications.
EHCI Hand-off
This is a workaround for OSes that does not support EHCI hand-off. The EHCI owner-
ship change should be claimed by the EHCI driver.
USB transfer time-out
The time-out value for Bulk and Interrupt transfers.
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.
Aptio Setup Utility - Copyright (C) 2012 American Megatrends, Inc.
Version 2.15.1227 Copyright (C) 2012 American Megatrends, Inc.
USB Confi guration
USB Devices:
1 Keyboard, 1 Mouse, 2 Hubs
Legacy USB Support
EHCI Hand-off
USB hardware delays and time-outs:
USB transfer time-out
Device reset time-out
Device power-up delay
Advanced
[Enabled]
[Disabled]
[5 sec]
[10 sec]
[Auto]
 Select Screen
 Select Item
Enter: Select
+/-: Change Opt.
F1: General Help
F2: Previous
Values
F3: Optimized Defaults
F4: Save and Reset
ESC: Exit
Device reset time-out
Selects the USB mass storage device start unit command timeout.
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.