[Xen-devel] Re: [ivtv-devel] Problems loading ivtv in Xen - DMA issues?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 Jul 2005, at 16:38, David Muench wrote:

> Looks like it didn't quite work. I started a capture and then ended it
> 20 seconds later, and I still have a zero byte file. Ivtv has some new
> messages in dmesg though:
One last thing you might want to try is to edit 
linux-2.6.11/arch/xen/i386/kernel/pci-dma.c. There you will see that 
there are four separate uses of memcpy(), each conditional on a test of 
the form 'if (direction != DMA_xxx)'. You *might* have more success if 
you remove the direction-conditional tests and always memcpy.
Apart from that, this needs someone with hardware and expertise, and 
who cares about both ivtv and xen, to wade in. :-)
 -- Keir


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