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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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