第三章 BIOS 功能介绍
EC5-1817LNAR
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USB Configuration
Aptio Setup Utility – Copyright (C) 2010 American Megatrends, Inc.
Advanced
USB Configuration
USB Devices:
1 Keyboard，1 Mouse, 2 Hubs
Legacy USB Support [Auto]
EHCI Hand-off [Disable]
USB hardware delays and time-outs:
USB transfer time-out [20 sec]
Device reset time-out [20 sec]
Device power-up delay [Auto]
→←：Select Screen
↑↓：Select Item
Enter：Select
+/-：Change Opt
F1：General Help
F2：Previous Values
F3：Optimized Defaults
F4：Save
ESC：Exit
Version 1.28.1119. Copyright (C) 2010,American Megatrends, Inc.
Legacy USB Support
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.
EHCI Hand-off
This is a workaround for OSes without EHCI hand-off support. The EHCI
ownership change should be claimed by EHCI driver
USB transfer time-out
The time-out value for Control, Bulk, and Interrupt transfers。
Device reset time-out
USB mass storage device Start Unit command time-out。
