[ECOS] Re: ARM FIQ handling problem

[R&D4 <r&d4 at dave-tech dot it>]

Hi Rupesh!

apart some other minor changes (for FIQ vs IRQ configuration) I just use
two differt stack for IRQ and FIQ handling, much like Gary pointed out
in this topic:

http://sourceware.org/ml/ecos-devel/2004-10/msg00087.html

If I recall correctly you should also change a bit of code in FIQ
handling inside vectors.S, because there is a fall through to IEQ code
that MUST be avoided (so just duplicate the code! :-) )

Take care to disable FIQ and not only IRQ when handling FIQ, of course.

After those changed I had 1 FIQ and many IRQ working together preatty
well (with a good impact on interrupt latency! :-) )

HTH

Best Regards,


-- 

Amon

DAVE Srl - Electronics System House
e-mail address: r&d4@dave-tech.it


Rupesh Kumar wrote:
> Hi All,
> 
> I am facing some problem with ARM-FIQ handling.
> 
> I have two interrupts when i keep one of them as FIQ and Other as IRQ
> then i am getting exceptions(Data Abort,Undefined Instructions..)
> When both are IRQ then everything is fine.
> 
> This i am expecting to be problem with eCos FIQ Handling.
> 
> I have seen the mailing list and found out that my problem is similer
> to this thread I have tried the approaches in this thread but they are
> not helping me.
> 
> http://sourceware.org/ml/ecos-devel/2004-10/msg00083.html
> 
> Can any one please help me.
> 
> Thanks
> Rupesh
> 
> 

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