On Tue, 12 Aug 2003, Vasile Surducan wrote:

>   My problem was a simple bank switching lost. The truth is you don't need
> neither a read from the port nor a write to port to clear gpif... I have
> checked this on 877 too, but now I've guessed that was the problem.
> It was a simple bank switching ans someone told me that privately.
> Thank's all.

Reading or writing the port will not clear GPIF, you need to do that by
clearing the bit.  You do however need to read the port to clear the
mismatch condition.  If you don't, you may run into problems - I know, I
have encountered them.  I don't remember off hand whether it was a
constant interrupt or never getting the interrupt, but it was definitely a
problem solved by simply reading the port before going into SLEEP mode.

Dale
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