Philippe Gerum wrote:
> On Mon, 2006-09-11 at 14:20 +0200, Wolfgang Grandegger wrote:
>> Matthias Fuchs wrote:
>>> Hello Philippe,
>>>
>>> that helps. I will do some further testing.
>>>
>>> Matthias
>>>
>>>
>>> On Monday 11 September 2006 12:20, Philippe Gerum wrote:
>>>> It's likely an Adeos issue. Could you try this patch? TIA,
>>>>
>>>> --- arch/ppc/syslib/ppc4xx_pic.c~  2005-10-28 02:02:08.000000000 +0200
>>>> +++ arch/ppc/syslib/ppc4xx_pic.c   2006-09-11 12:18:14.000000000 +0200
>>>> @@ -72,7 +72,8 @@
>>>>            mtdcr(DCRN_UIC_SR(UIC##n), mask);                       \
>>>>            ACK_UIC##n##_PARENT                                     \
>>>>    }                                                               \
>>>> -  if (!(status & (IRQ_DISABLED | IRQ_INPROGRESS))) {              \
>>>> +  if (!ipipe_root_domain_p ||                                     \
>>>> +      !(status & (IRQ_DISABLED | IRQ_INPROGRESS))) {              \
>>>>            ppc_cached_irq_mask[n] |= mask;                         \
>>>>            mtdcr(DCRN_UIC_ER(UIC##n), ppc_cached_irq_mask[n]);     \
>>>>    }                                                               \
>> Philippe, could you please explain the problem in more detail? And what 
>> are the consequences for other PowerPC ARCs and PICs, also for Linux 2.4?
> 
> The issue lies in the fact that PICs *_end() routines may be called over
> the Xenomai domain, and actually are, most of the time, since
> xnintr_irq_handler() -which invokes xnarch_end_irq()- is always called
> from the the Xenomai stage in the Adeos pipeline.
> 
> In such a case, we must not check for the Linux-defined IRQ bits (e.g.
> IRQ_INPROGRESS), and always send the eoi, since those bits are not
> relevant to the Xenomai context. The patch above ensures this.
> 
> And yes, the 2.4 patch has the very same problem, which should be fixed
> the same way for all supported ppc platforms in the various PIC
> management code. Oops.

And why didn't this render PPC-over-2.4 useless, i.e. what is special
about this 405-scenario?

Jan

Attachment: signature.asc
Description: OpenPGP digital signature

_______________________________________________
Xenomai-core mailing list
Xenomai-core@gna.org
https://mail.gna.org/listinfo/xenomai-core

Reply via email to