Re: [Xen-devel] Xen 4.2.0-rc4 issues with DVB tuner

[Javier Marcet <jmarcet@xxxxxxxxx>]

On Mon, Sep 17, 2012 at 10:09 PM, Javier Marcet <jmarcet@xxxxxxxxx> wrote:

>>> >> I wonder whether it would work within a DomU with the PCIe tuner
>>> >> passed through.
>>> >
>>> > I've a 4 channel security card passed in and it works nicely. The
>>> > trick is that you need 'iommu=soft' on the domU command line.
>>>
>>> All right. But is it normal that it does not work under the dom0?
>>
>> No. PV domU and PV dom0 are pretty much the same in the way of handling
>> interrupts, ports, etc.
>>
>> If you crank up the debug level of the kernel (debug loglevel=8) and
>> of the driver do you get anything obvious? What about the questions
>> I've asked?
>
> Booting with 'debug loglevel=8' as kernel parameters I still get no errors or
> warnings anywhere.
>
> I'm out of ideas and I don't have any other PCIe tuner card to try.
>
> It is looking more and more as a cx23885 (the module the card uses) issue.
> It is really odd since I you get some data, but just like if there was very
> poor reception, more noise than signal.
>
> If you can think of some other way to debug this, I'll try it.

I've just realized that I have quite a lot of debug options in the dvb
driver. Right
now I have one tuner in use, but when it finishes (or tomorrow) I'll enable some
debug output in the dvb subsystem and the cx23885 module in particular and
see whether I can get some more info.

Even so, if you deem worth checking something else, I'm open to try anything.


-- 
Javier Marcet <jmarcet@xxxxxxxxx>

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