Re: [Xen-users] DVB tuner not working in PV guest

[Steve Allison <xen-users@xxxxxxxxxxxxxxxxxx>]

On 28/07/2011 20:16, Simon Hobson wrote:
> At 21:00 +0100 23/7/11, I wrote:
> > I'm trying to setup a new home server, and part one is getting a new 
> > version of MythTV running. Host is Debian with Xen4.0.1 and kernel 
> > 2.6.32-5-xen-amd64, PV guest is also Debian with kernel 
> > 2.6.32-5-xen-amd64. I have a DVB-T tuner (HVR-1200, PCIe card) I am 
> > trying to use in the guest with pciback.hide etc. The whole thing is 
> > running on an HP Proliant Microserver I bought while HP had a mail-in 
> > rebate going.
> > If I boot the host without Xen, I can access the card with dvbtune 
> > and it lists the channels in a multiplex :
> > <snip>
> > And the card shows up in the boot log :
> > > 02:00.0 Multimedia video controller: Conexant Systems, Inc. CX23885 
> > > PCI Video and Audio Decoder (rev 02)
> > I've hidden the card from Dom0 by adding "xen-pciback.hide=(02:00.0)" 
> > to the grub config.
> >
> > When I boot the guest, I can see it's tuner card
> > > eddi kernel: [   25.348011] cx23885[0]/0: found at 0000:00:00.0, 
> > > rev: 2, irq: 16, latency: 0, mmio: 0xfe600000
> > But if I try to access it with dvbtune, it can't detect any channels :
> >
> > > # dvbtune -f 801833000 -i
> > > Using DVB card "NXP TDA10048HN DVB-T"
> > > tuning DVB-T (in United Kingdom) to 801833000 Hz
> > > polling....
> > > Getting frontend event
> > > FE_STATUS:
> > > polling....
> > > Getting frontend event
> > > FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI 
> > > FE_HAS_SYNC
> > > Bit error rate: 1965
> > > Signal strength: 61680
> > > SNR: 131
> > > FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI 
> > > FE_HAS_SYNC
> > > <transponder type="T" freq="801833000">
> > > Nothing to read from fd_pat
> > > Nothing to read from fd_sdt
> > > </transponder>
> No ideas ?
> Any suggestions where to look or further information I need to provide ?
I'm using a similar card.

Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)

Simply booting up in Xen on the dom0 rendered the card unable to scan 
for channels. It would load its drivers, create its block devices and 
seem to function in all aspects except for tuning, basically rendering 
it useless.
I had the same idea as you and was trying to get a PV mythtv backend, 
after it failing in domU, I moved to just trying to get it to work on 
the dom0 but was suffering the same issues.
I was using the w-scan debian package to scan for channels without 
needing to install Myth for testing and found that in a standard *-xen 
kernel it worked fine, but if I loaded xen dom0 with the same kernel, it 
didn't.
--
May the ping be with you ..


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