[linux-dvb] cx23885 driver and DMA timeouts

Steven Toth stoth at linuxtv.org
Mon Jun 23 14:51:10 CEST 2008

stev391 at email.com wrote:
> Steven,
> The card works perfectly using Chris Pascoe's branch, I can use both 
> tuners at the same time. It only stuffs up when I try and merge the 
> relevant sections into tip, as per the patch I attached in the previous 
> email.  So this eliminates bios/hardware faults. I can also try in 
> windows for you, but I'm sure this is not the fault.
> I would like to run a more modern version of the hg code as I have other 
> cards sitting around that could go in the same system and also I fear 
> that if somebody doesn't do the work to get it into tip, support will 
> disappear for newer kernels.
> Thanks for help, any further advice?
> (Also you lost me a bit with sram and risc, is this for the 
> microprocessor on the tv card or is it on my motherboard/cpu? And do you 
> have any documentation about them so I can learn more about it?)
> Stephen.
>     ----- Original Message -----
>     From: "Steven Toth"
>     To: stev391 at email.com
>     Subject: Re: [linux-dvb] cx23885 driver and DMA timeouts
>     Date: Sat, 21 Jun 2008 08:54:39 -0400
>      > As soon as I try to access both cards at the same time it breaks
>      > and only a full computer restart will fix it, i have tried
>      > unloading all the modules that I can find that this card uses and
>      > loading them again. I get the syslog attached below (cx23885 with
>      > debug =1). It doesn't matter what progam i use to access them
>      > (tried gxine, totem, mythtv) it all works the same, only one at a
>      > time or it breaks.
>     If the vidb and vidc (ts1 / ts2) bridge streams each single channel
>     correctly, but not both together then this is either a sram
>     configuration issue (the risc engine's workspace is being corrupted
>     by another risc channel), or your system has a pcie compatibility
>     issue.
>     I've seen both of these issues in the past.
>     I don't have a hardware product with demodulators on vidb and c, so
>     that's not something I can repro.
>     Can you dual boot the same system under windows and remove any pcie
>     compatibility doubts?
>     - Steve

No need to try windows, if you have the driver already running (pascoe's 
patches) then your chipset and hardware are fine.

Sounds like you have a simple merge issue.

Try to figure out which parts of the merge actually create the problem 
then bring that issue back to this list for discussion.


- Steve

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