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Date: Fri, 6 Feb 2004 11:38:15 -0800 (PST)
From: Nate Lawson <nate@root.org>
To: John Baldwin <jhb@FreeBSD.org>
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Subject: Re: Interrupt storm on acpi0 occurred after madt.c change
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On Fri, 6 Feb 2004, John Baldwin wrote:
> On Thursday 05 February 2004 08:54 pm, Nate Lawson wrote:
> > Actually, after looking at Peter's MADT, it appears it does have an
> > override from 9 to 20 with the polarity "conforming" and level-triggered.
> > I assume that conforming means low for his system.
>
> Does he have conforming polarity or active-hi?  If it's conforming then I
> might be able to work around this.  I thought it was acthive-hi though.
> (Other broken boards use active-hi / level but need active-lo / level to
> work.)

Conforming.  Here's the override entry from his ASL:

Type=INT Override
BUS=0
IRQ=9
INTR=20
Flags={Polarity=conforming, Trigger=level}

So since the bus type is always ISA, you should treat "conforming" as
active-hi for all override directives.  You should also explicitly check
the bus field for 0 (ISA) and if it's something different, ignore the
override since it is probably corrupt.

-Nate