ACPI SCI flags
Nate Lawson
nate at root.org
Wed Apr 21 19:48:51 PDT 2004
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
More information about the freebsd-acpi
mailing list