[mythtv-users] 0.14 + VIA M1k + UDMA6 + full duplex=prebufferingpause - FIXED

Mikhail D'Vane mikhaildvane at hotmail.com
Sat Mar 27 22:59:41 EST 2004


Glad to hear it!  You have no idea how many things I tried before I finally
found the answer.  (Actually... maybe you do...).  I know for a fact that
stepping 1 Nehemiah's are detected correctly.  Perhaps those are the
only ones that actually work without the hack?

Please pass it along - it's a very frustrating problem and I don't believe 
it's
widely known.

Mik

>From: "Scott Rowe" <mythgnomer at rowelab.com>
>Reply-To: Discussion about mythtv <mythtv-users at mythtv.org>
>To: "'Discussion about mythtv'" <mythtv-users at mythtv.org>
>Subject: RE: [mythtv-users] 0.14 + VIA M1k + UDMA6 + full 
>duplex=prebufferingpause - FIXED
>Date: Sat, 27 Mar 2004 20:54:15 -0600
>
>Aha! Mikhail, that was indeed the issue. So it seems that both the 693 and
>695 have this bug.
>
>Anyone using any other version of the Nehemiah processor? If I can confirm
>this, I'll pass it along to the various epia wiki / HOWTO maintainers.
>(Assuming it's not widely known / already fixed.)
>
>691 = fine
>693 = broke
>695 = broke
>
>-Scott Rowe
>
> > -----Original Message-----
> > From: mythtv-users-bounces at mythtv.org
> > [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Scott Rowe
> > Sent: Friday, March 26, 2004 8:51 PM
> > To: 'Discussion about mythtv'
> > Subject: RE: [mythtv-users] 0.14 + VIA M1k + UDMA6 + full
> > duplex =prebufferingpause
> >
> >
> > > -----Original Message-----
> > > From: mythtv-users-bounces at mythtv.org
> > > [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Mikhail D'Vane
> > > Sent: Thursday, March 25, 2004 8:34 PM
> > > To: mythtv-users at mythtv.org
> > > Subject: RE: [mythtv-users] 0.14 + VIA M1k + UDMA6 + full duplex
> > > =prebufferingpause
> > >
> > > You probably have a stepping 3 of the Nehemiah processor.
> > > This processor (or perhaps the kernel support for it) does
> > not report
> > > mmx capabilities correctly.
> > >
> > > One of the directories in /proc will tell you your CPU stepping.
> > > (Sorry, not in front of any linux machine right now, so I
> > can remember
> > > exact directory - it's name is pretty obvious.)
> > >
> > > If you have a stepping 3, you need to hard code the edx
> > return value
> > > in the cputest.c file and recompile mythtv (or maybe just
> > > mythfrontend).  You can find the exact information on what
> > to add to
> > > the cputest.c file if you search the archive for posts by me with
> > > "cputest.c" in them.
> > >
> > > (cputest.c is in the myth source code.  If you go to the top level
> > > directory where you unpacked mythtv, just do "find -name
> > cputest.c" to
> > > get the path.)
> > >
> > > Hope this is your problem - I puzzled over it for *months* before
> > > stumbling onto the solution (Google is your friend - try "edx
> > > cputest.c epia" and you'll find the info I did.)
> > >
> > > Mik
> >
> >
> >
> >  Actually, cpuid is 695 (stepping = 5).. So it may not just be
> >  693 that has this problem (forgot to mention that I'd looked
> >  at this, but since it was 695, I ignored it.)
> >
> >  [root at mythbox root]# cat /proc/cpuinfo
> >  processor       : 0
> >  vendor_id       : CentaurHauls
> >  cpu family      : 6
> >  model           : 9
> >  model name      : VIA Nehemiah
> >  stepping        : 5
> >  cpu MHz         : 999.838
> >  fdiv_bug        : no
> >  hlt_bug         : no
> >  f00f_bug        : no
> >  coma_bug        : no
> >  fpu             : yes
> >  fpu_exception   : yes
> >  cpuid level     : 1
> >  wp              : yes
> >  flags           : fpu de pse tsc msr mtrr pge cmov mmx fxsr sse
> >  bogomips        : 1992.29
> >
> >  I'll recompile anyway with the fix in place, and if it does
> > turn out to be the issue, I guess the stepping 5 version also
> > has the same issue as the 3.
> >
> >  Live and learn!
> >
> >  Thanks,
> >  -Scott
> >
> >
> >
>
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