Questions on interrupt vector assignment on MPC8641D

tiejun.chen tiejun.chen at
Thu Oct 14 12:39:59 EST 2010

Scott Wood wrote:
> On Wed, 13 Oct 2010 09:17:01 +0800
> "tiejun.chen" <tiejun.chen at> wrote:
>> Scott Wood wrote:
>>> The crash is happening somewhere in mpic_set_irq_type():
>> Agreed. That is just where I pointed out on my email replied for OOPS. To enable
>> DBG to figure out 'src' and 'mpic->irq_count' from the file,
>> arch/powerpc/sysdev/mpic.c,    .
>> ======
>> int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
>> {
>> 	......
>> 	if (src >= mpic->irq_count)
>> 		return -EINVAL;
>> 			^
>> 			I think this OOPS may be from here.
> No, it's after that.  His board code is using the mpic's "isu" remapping

I means OOPS is *from* here. According to David's call trace,
mpic_set_irq_type() is the last issued function. And that corresponding return
value, R3, is '0xffffffea', -22, and also '-EINVAL'. If everything is OK, I
think we should not be failed with returning '-EINVAL' here. Right? So I think
we should dump 'src' (mpic_irq_to_hw(virq)) and 'mpic->irq_count'. Then figure
out why 'src' >= 'mpic->irq_count'. I think this can make our debug life easier.


> mechanism, and the MSIs aren't covered, so those registers aren't
> ioremapped.
> -Scott
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