Re: IBM R40 FFixedHW register?

[Ducrot Bruno <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org>]

On Tue, Oct 21, 2003 at 03:39:55PM -0700, Nate Lawson wrote:
> I'm testing out my new cpu driver for FreeBSD and came across an
> interesting case in supporting Px states.  They work great on several
> laptops but the R40 can't set Px states.  I looked at the ASL and found
> that the control/status register pair is FFixedHW.
> 
>             Return (Package (0x02)
>             {
>                 ResourceTemplate ()
>                 {
>                     Register (FFixedHW, 0x40, 0x00, 0x0000000000000199)
>                 },
> 
>                 ResourceTemplate ()
>                 {
>                     Register (FFixedHW, 0x10, 0x00, 0x0000000000000198)
>                 }
>             }
> 
> I guess I have to find the datasheet for that model to figure out how to
> access those registers.  Anyone come across this before?  What space are
> those actually in (IO, Memory, ??).  The register widths are also strange
> (64 and 16 bits).
> 

They are MSRs for Pentium-M found in Centrino platforms, but acpi spec would
only say you that you have to contact the CPU vendor.

-- 
Ducrot Bruno

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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