freebsd-drivers

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Re: Gathering Hardware State During a Driver Initiated Kernel Panic Sam Leffler Mon Nov 24 14:01:01 2008 

David Christensen wrote:
Is there a method or callback in FreeBSD where a driver can be notified that it has caused a kernel panic in order to generate a dump of internal hardware state information? I've 
written a sysctl call for manual intervention and can handle
some "expected" hardware events completely in the driver but
I don't know of a way to get control again in cases where the driver wasn't expecting a failure.
Not sure how one can deduce a driver is at fault but you might define a ddb command for the driver and invoke that on panic using the ddb script mechanisms (see ddb(4)). 

   Sam

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