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Date: Wed, 21 Apr 2004 19:48:52 -0700 (PDT)
From: Nate Lawson <nate@root.org>
To: "Brown, Len" <len.brown@intel.com>
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cc: freebsd-acpi@freebsd.org
Subject: Re: ACPI SCI flags
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On Fri, 9 Apr 2004, Brown, Len wrote:
> Nate,
>
> I think we finally got the vague part of the ACPI spec
> regarding SCI polarity/trigger cleared up.  In Linux
> as of 2.4.26 and 2.6.5 we now do this:
>
> PIC mode:
> 	force level/low via ELCR always.

Did you find that made a difference on some systems?  If so, which ones?
The opinion here was that ELCR is probably EISA-only.

> APIC mode:
> 	no override:
> 		force level/low always
> 	override w/ explicit polarity/trigger:
> 		do exactly what override says
> 	override w/ "compatible" polarity/trigger:
> 		compatible trigger = level
> 		compatible polarity = low
>
> Of course this makes the SCI a special case WRT
> interpreting "compatibility" as compared to other
> overrides.

By "compatible" do you mean "conforming"?  If not, what do you mean for
"compatible"?

-Nate