Date: Fri, 6 Feb 2004 11:38:15 -0800 (PST) From: Nate Lawson <nate@root.org> To: John Baldwin <jhb@FreeBSD.org> Cc: current@freebsd.org Subject: Re: Interrupt storm on acpi0 occurred after madt.c change Message-ID: <20040206113204.K53518@root.org> In-Reply-To: <200402061345.39109.jhb@FreeBSD.org> References: <20040205175123.Q49384@root.org> <200402061345.39109.jhb@FreeBSD.org>
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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
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