It's Intel chipset policy.
When XHCI is configured as AUTO or SMART AUTO, the ports of usb at BIOS phase
will be managed by EHCI rather than XHCI, but in OS phase, these ports will be
managed by XHCI if XHCI driver exists.
From: Guilherme Marques
[mailto:[email protected]]
Sent: Saturday, March 28, 2015 01:44
To: [email protected]
Subject: Re: [edk2] PCI device of USB3 controllers problem
The XHCI driver always loads, and it always appears as managing the USB3.0
controller. I checked the USB mode in the BIOS, and it was at AUTO. I tried
changing it to ENABLED and it apparently solved the problem. Here's what I
noticed:
With USB mode as AUTO, the EHCI driver appears as managing a second controller
(the one where the devices appear to be connected, at 0.29.0).
With USB mode as ENABLED, the EHCI driver appears as managing no devices.
Do you have any ideas as to what causes this behavior?
Thank you!
From: Tian, Feng [mailto:[email protected]]
Sent: terça-feira, 24 de março de 2015 21:46
To: [email protected]<mailto:[email protected]>
Subject: Re: [edk2] PCI device of USB3 controllers problem
Are you sure the EDKII XHCI driver is loaded? And can you check how you setup
the option under BIOS "PCH Configuration/Usb Configuration/XHCI mode", Which
one of ENABLE/DISABLE/AUTO/SMART AUTO is chosen?
From: Guilherme Marques
[mailto:[email protected]]
Sent: Wednesday, March 25, 2015 01:46
To: [email protected]<mailto:[email protected]>
Subject: [edk2] PCI device of USB3 controllers problem
Hello,
I'm working with UDK2014, trying to get some information on USB devices. I'm
using the PCI bus, device and fuction numbers of the USB controller as part of
the identification, but I bumped into a problem: while in general I can check
the information on Windows (I'm using Usb Device Viewer, part of the Debugging
Tools for Windows), and the info I get on UEFI will match, in some machines
(USB3 capable) the information mismatch. An example:
Usb Viewer lists two USB controllers: on 0.29.0 (EHCI controller) and 0.20.0
(xHCI controller). My USB device is listed as plugged in port #2 (1-indexed) of
0.20.0 controller.
UEFI shows 0.20.0 controller as "Undefined", and no devices attached to it.
Instead, it shows my USB device on the following device path:
PciRoot(0x0)/Pci(0x1D,0x0)/USB(0x0,0x0),USB(0x1,0x0). So, plugged on a hub
within the 0.29.0 controller.
I'm puzzled as to why the information differs, and I'm trying to find a way to
get consistent information between the windows app and UEFI drivers. Could
anyone point me in the right direction?
Thank you all.
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