Re: how to allow board writers to customize driver behavior (watchdog here)

[Daniel Newby]

On 5/24/07, Paul Mundt <lethal@xxxxxxxxxxxx> 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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/