On 5/25/07, Daniel Newby <[email protected]> wrote:
On 5/24/07, Paul Mundt <[email protected]> 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.
it does ... it has four modes:
- reset (drivers/char/watchdog/bfin_wdt.c)
- interrupt (i'll prob write a clockevents driver for this)
- NMI (no plans to do anything for this as NMI is unused in Blackfin)
- nothing (have yet to find a use case for this)
-mike
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