qemu-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-devel] USB-OHCI / UHCI: Isochronous transfer not working on Linux


From: Thomas Bandelier
Subject: [Qemu-devel] USB-OHCI / UHCI: Isochronous transfer not working on Linux host
Date: Thu, 27 Nov 2008 15:05:36 +0100

Hi all,

Following several tests we did with qemu trunk, Isochronous transfer seems to be broken with the head of qemu.

We tried following Os (targets):
-WinXP (i386)
-Win2k (i386)
-Several linux kernel ( 2.6.26-1 (i386), 2.6.27 (ARM) )

On our host we are using Gentoo with 2.6.23 and 2.6.27 kernel.

Following USB devices were tested:
-USB 2.0 logitech webcams
-Terratec USB2.0 Cynergy hybrid XS FM tuner.

Both OHCI and UHCI configurations were tested in i386 target.
Only OHCI was tested in ARM target.

In all these configurations, it was never possible to initiate isochronous USB transfer. It was possible to enumerate the devices but as soon as isochronous packets were used, the procedure failed. It means for example that no picture was retrieved from the webcams, and no audio data was retrieved from FM tuner.

It is important to mention that all theses devices perfectly work on our host.

After some search in this maling list archives, it seems that no work has been made on these aspects since Arnon Gilboa sent some patches more than one year ago. Am I wrong?

So It would be very useful for us to have a feedback from the community on this point.
Has someone met the same problems? Has someone investigated this aspect?
Is someone regularly using this feature?

How can we investigate this problem?

Thanks

Thomas













reply via email to

[Prev in Thread] Current Thread [Next in Thread]