[mythtv-users] FC12 firewire i686 vs x86-64?

Greg Zornetzer gzornetzer.lists at gmail.com
Mon Jan 4 02:24:13 UTC 2010


On Sun, Jan 3, 2010 at 8:12 AM, Jarod Wilson <jarod at wilsonet.com> wrote:

> On Sat, Jan 02, 2010 at 10:57:04PM -0800, Greg Zornetzer wrote:
> > Hi all,
> > I'm looking at upgrading my myth box from FC9 / Myth 0.21.  One of my
> main
> > requirements is that I get firewire to work for recording off a cable
> box.
> > I've pulled down some livecd images of FC12 to test out the firewire
> > recording capabilities.  I found a rather odd problem.
> >
> > If I use the i686 livecd, I successfully get firewire recordings.  If I
> use
> > the x86-64 livecd, I get a zero-length file (I tried multiple times to
> get a
> > recording).  I'm using a p2p connection, and the following commands:
> >
> > plugctl -n 1 oPCR[0].n_p2p_connections=1
> > test-mpeg2 -r 1 > test.mpg
> >
> > As much as I'd like to switch to x86-64, I'm going to stick with i686 if
> I
> > can't make firewire happy.  Unfortunately, I can't seem to activate
> > broadcast mode on x86-64 to test that.  Has anyone else encountered a
> > problem like this? Ideas?
>
> Hrm. I've seen a controller or two that had a faulty dma engine in it,
> and use of certain memory regions would cause it to stall out. Its
> possible you've got another such controller, and running i386 vs.
> x86_64 gives you slightly different dma memory regions allocated to the
> card. Please file a bug at bugzilla.redhat.com! Include as many
> specifics about the firewire controller and the system its in...
>
>
 Hi Jarod,
I'll see about doing that.  In the mean time, I think I'll run 32 bit FC12
for now - I found another person on the wiki who had similar problems with
64 bit.
On a related note, thanks very much for all your hard work on the firewire
functionality in myth.
-Greg
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