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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