Re: System bus influence in bttv DMA

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dpetrini@xxxxxxxxxxxxx wrote:

 > Hello all,
 >
 > Last week i faced the following problem:
 >
 > I have my tv application, based on zapping and  a Flyvideo 98 FM tv
board,
 > that runs ok in my machine with a Celeron 700 MHz processor.
 > I did an upgrade for a 900 MHz celeron.
 > The tv application started to crash.


Could you be a bit more precise - does just the application crash, or
does the system hang?

>>>>>>>>>>>>>The system hangs entirely.

 > After a lot of time looking for answers I realised that this happened
 > because the system bus (communication through memories and main
processor)
 > has chaged from 66 MHz to 100 MHz.
 > I forced the system bus to come back to 66 MHz in the bios (and as
 > side-effect the 900 MHz Celeron turned ou to be a 600 MHz Celeron) and
 > things came back to normallity.
 >
 > Has anyone a hint on how to make it work in the 100  MHz bus?
 > Does it make sense at all?
 >
 > Thanks for helps.


I have the suspicion you have a board based on the bx chipset? I did
have the same problem some time ago when I changed from a Celeron 333 to
a Celeron 850, and fixed it by increasing the pci latency timer. But, in
   the most recent kernels, it doesn't help, it still lock ups from time
to time. Changing to bttv-0.8.31 fixed the problem.


>>>>>>>>>>>>>I use SIS630 chipset and the motherboard has the ability to
handle this bus speed as stated on its manual. I´m using a 0.7.x bttv, it
is not possible at the moment but later I will try the 0.8.x bttv.



(The above answer makes only sense if you experience hangs, otherwise if
just the app crashes it doesn't make a lot of sense.)

Roland



Thanks for the help so far,

Daniel




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