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