6.0-CURRENT SNAP004 hangs on amr (long)
Scott Long
scottl at samsco.org
Thu Jul 7 01:04:03 GMT 2005
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.
Scott
More information about the freebsd-current
mailing list