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3.2.2.4 USB Configuration
Item
Legacy USB Support
EHCI Hand-off
USB transfer time-out
Device reset time-out
Device power-up delay
Options
Enables Legacy USB support. AUTO option
Enabled
disables legacy support if no USB device is
Disabled
connected. DISABLED option will keep USB
Auto
devices available only for EFI applications.
This is a workaround for OSes without EHCI
Disabled
hand-off support. The EHCI ownership
Enabled
change should be claimed by EHCI driver.
1sec
5sec
The time-out value for Control, Bulk, and
10sec
Interrupt transfers.
20sec
10sec
20sec
USB mass storage device Start Unit
30sec
command time-out
40sec
Maximum time the device will take before it
properly reports itself to the host Controller.
Auto
"Auto" uses default value: for a Root port it is
Manual
100ms, for a Hub port the delay is taken from
Hub.
User's Manual
Description
EMX-A55E User‟s Manual 49
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