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SubjectRe: how to allow board writers to customize driver behavior (watchdog here)
On 5/24/07, Paul Mundt <lethal@linux-sh.org> wrote:
> So far the only example anyone has provided outside of periodic timers or
> hardware reset has been dumping the stack when something gets stuck.
> Softlockup does this already today, using a timer.

Many watchdogs can be hooked up to a non-maskable interrupt (NMI) that
cannot be disabled or preempted. You get a stack dump even for drastic
bugs: ISR lock up, timer misconfiguration, level-sensitive interrupt
line stuck asserted, and so forth. Getting that information by other
means can be painful and/or expensive.

The Blackfin chip in the original message appears to support watchdog
NMI.

-- Daniel
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