Advantech SOM-5991, User Manual

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SOM-5991 User Manual 34
3.2.2.9 USB Configuration
Figure 3.15 USB Configuration
 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.
 XHCI Hand-off
This is a workaround for OS without XHCI ownership change should be claimed
by XHCI driver.
 EHCI Hand-off
This is a workaround for OS without EHCI ownership change should be claimed
by EHCI driver.
 USB Mass Storage Driver Support
Enable or Disable USB Mass Storage Driver Support.
 Port 60/64 Emulation
Enable I/O port 60h/64h emulation support. This should be enabled for the com-
plete USB keyboard legacy support for non-USB aware OS.
 USB transfer time-out
This time-out value for Control, Bulk, and Interrupt transfers.
 Device reset time-out
USB mass storage device Start Unit command time-out.
 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.