[PATCH 1/2] I2C: Convert PCF50606 to I2C device

Andy Green andy at openmoko.com
Sat Oct 4 11:05:20 CEST 2008

Hash: SHA1

Werner Almesberger wrote:
> Andy Green wrote:
>> In addition there are hard lockups from Glamo nWAIT,
> BTW, I think you once electrically forced nWAIT high to free the
> system from the Glamo's deadly grasp, didn't you ? Could that be
> a way for better debugging ?

It lets me reach the crash caused by the AUX key debug code, so I can
see where we hung.  But the Glamo is dead at that point, it's
fundamentally a sign it was broken either by the suspend actions on it
or the resume attempt on it.  So that's really all that can be squeezed
out of forcing it over nWAIT blockage.

> E.g., if the same wire went to a currently unused interrupt, e.g.,
> conveniently accessible EINT3, then it could also activate some
> debug dump code at the time nWAIT is forced.

Procedure AUX key while stalled and then force nWAIT deasserted runs the
dmesg dump / panic code without it (or more accurately given what you
wrote, AUX interrupt is used).

- -Andy
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