Can't get FIQ interrupt to work on i.mx233

Dave Martin Dave.Martin at
Tue Jul 16 12:16:43 EDT 2013

On Tue, Jul 16, 2013 at 08:44:43PM +0900, Juha Lumme wrote:
> Hi Russel,
> Thanks for your reply.
> And thanks for pointing out the wrong instruction there with the ldr
> instruction.
> However, unfortunately the code still doesn't seem to trigger
> anything (neither to clear the IRQ bit in the timer, nor the GPIO
> output).. It seems to me as if the handler never gets called. Is
> there a good way to confirm that any activity is actually triggered
> when timer3 reaches 0, and the IRQ bit is set to 1 ?

A brutal, but simple, way to confirm that your handler is being called
is to try putting an infinite loop in there:

	b	.

If your board then locks up, the handler is almost certainly getting


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