Bios setup – DFI HR900-B User Manual
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3
BIOS Setup
USB Confi guration
This section is used to confi gure 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
ownership change should be claimed by the EHCI driver.
USB transfer time-out
The time-out value for Bulk and Interrupt transfers.
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.
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) 2011 American Megatrends, Inc.
Version 2.14.1219. Copyright (C) 2011 American Megatrends, Inc.
USB Confi guration
USB Devices:
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]
[20 sec]
[20 sec]
[Auto]
Select Screen
Select Item
Enter: Select
+/-: Change Opt.
F1: General Help
F2: Previous
Values
F3:
Optimized Defaults
ESC: Exit