Wilkinson, Alex wrote: > 0n Wed, Jul 06, 2005 at 11:10:29AM -0600, Scott Long wrote: > > >I wonder if the AMR interrupt is getting routed to the ata interrupt > >pins. With the ata driver enabled, the OS gets stuck in an infinite > >loop of trying to service what it thinks in an ata interrupt. With > >the ata driver disabled, the ata interrupt lines stay disabled and the > >OS sees nothing. Would it be possible to send an NMI to the machine > >while it's hung with the ata driver enabled? If not, we can probably > >drop some simple printf into the ata interrupt handler. > > Curious, how does one send a Non-Maskable-Interupt in FreeBSD ? > > -aW NMI's are sent by the hardware and received by the OS. Some server-class motherboards have NMI switches on them. In the ISA days, it was possible to trigger an NMI by shorting 2 particular pins in an ISA slot. ScottReceived on Wed Jul 06 2005 - 23:04:03 UTC
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