Philippe Gerum wrote:
> Jan Kiszka wrote:
>> Philippe Gerum wrote:
>>> Our Blackfin port has just been upgraded to the latest 2.6.23. The other
>>> good news is that we have now rebased this work over mainline kernels.
>>> The I-pipe patch below is an all-in-one, supporting the bf533, bf537 and
>>> bf561 dual core boards. Any Xenomai version from 2.3.2 and on can be
>>> used (albeit pre 2.4-rc4 will require to fix the default calibration
>>> value by hand for the bf561).
>>>
>>> If you happen to have any of these boards at hand, and really don't know
>>> how to spend geek time these days, please give this a try and send some
>>> feedback.
>>>
>>> http://download.gna.org/adeos/patches/v2.6/blackfin/adeos-ipipe-2.6.23-bf5xx-1.7-00.patch
>>>
>> Unfortunately, ipipe for bfin is still borken: my setup is 2.6.23.1 +
>> "uclinux mtd maps: add blackfin maps" + the ipipe patch above on a BF537
>> stamp. I'm running the cache calibrator over the serial console and a
>> hello world shell loop over telnet. When ipipe is enabled (no Xenomai)
>> and the calibrator is in its measurement cycle, the telnet connection
>> stalls. Actually, it seems the whole Linux scheduling stalls, because
>> when I turn this into a background loop, it doesn't make progress when
>> the calibrator runs. All this does not happen when I disable ipipe in
>> the config.
>>
> 
> Does the bug disappear with the patch below? (this is obviously not a
> fix since latency would skyrocket with this patch in, only a way to
> confirm that threading the timer IRQ causes the stall as we already
> observed a while ago with earlier versions).
> 
> --- a/arch/blackfin/kernel/ipipe.c
> +++ b/arch/blackfin/kernel/ipipe.c
> @@ -388,7 +388,7 @@ static void kick_irqd(unsigned irq, void *cookie)
> 
>  int ipipe_start_irq_thread(unsigned irq, struct irq_desc *desc)
>  {
> -     if (desc->thread || !create_irq_threads)
> +     if (desc->thread || !create_irq_threads || irq == IRQ_SYSTMR)
>               return 0;
> 
>       if (desc->ipipe_demux != NULL)
> 

Yep, this "solves" the problem here.

Jan

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