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4.4.7
USB Configuration
BIOS Setting
Legacy USB Support
XHCI / EHCI Hand-off
USB Mass Storage Driver
Support
Port 60/64 Emulation
USB Transfer time-out
Device reset time-out
Device power-up delay
30
Description
•
Enable: Enables Ledacy USB Support.
•
Auto: Disables legacy support if no USB
devices are connected.
•
Disable: Keeps USB devices available only
for EFI applications.
This is a workaround for OSes without XHCI /
EHCI hand-off support. The XHCI ownership
change should be claimed by XHCI driver.
Enables / Disables the support for USB mass
storage driver.
Enables I/O port 60h/64h emulation support.
This should be enabled for the complete USB
keyboard legacy support for non-USB aware
OSes.
The time-out value for Control, Bulk, and
Interrupt transfers.
Seconds of delaying execution of start unit
command to USB mass storage device.
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.
IOPS-302 User Manual
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