[mythtv-users] 0.14 + VIA M1k + UDMA6 + full duplex =prebuffering pause

Scott Rowe mythgnomer at rowelab.com
Fri Mar 26 21:50:57 EST 2004

> -----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!

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