Re: Build PST for AthlonXP

["Lukas Schrangl" <schrangl-hi6Y0CQ0nG0@public.gmane.org>]

> On Wed, Feb 04, 2004 at 11:45:25AM +0100, Lukas Schrangl wrote:
> > Hi!
> > 
> > I don't know wether this is the right mailinglist for my problem, but at
> > least I think here are some people who can help me.
> 
> Correct, the mailling list is the CPUFreq mailing list..
> 
> > Maybe someone remembers my problem: I have a AMD Athlon XP 2600+ mobile
> CPU
> > but neither ACPI- performance states nor cpufreq/powernow-k7 (no PST
> matching
> > this cpuid) do work.
> 
> Retrieving configuration from ACPI is a work in progress.  I do have
> some experimental patch for, but not publically available yet
> (it depends on others patches from Dominik, I'm not sure if that OK by
> now).
> 
> > Recently I browsed a bit through the powernow-k7 source and have now an
> idea
> > how it works. It shouldn't be too difficult to set up my own PST for my
> CPU,
> > should it?
> 
> Well, not so, especially if you can retrieve the configuration for the
> different
> states.
> The key is the control word, in the _PSS packages.
> 
> For example, suppose you have that:
> 
> Processor(..) {
> 	...
> 	Name (_PSS, Package () {	/* this may be a method, btw */
> 		Package () {
> 			0x0352,
> 			0x61A8,
> 			0x7D,
> 			0x009C414B,	/* that the control. */
> 			0x014B
> 		},
> 		Package () {
> 			...,
> 			...,
> 		}
> 	})
> 
> For the first one, this is 0x009C414B.
> The layout seems to be:
> bit 0-5: FID,
> bit 6-10: VID,
> bit 11-30: SGTC (or in other word 'latency' in 10 time micro second)
> bit 31-32: reserved.
> 
> Note that this is *not* confirmed by AMD people.
> 
> > I know about FIDs and VIDs and what they are good for, but can anyone
> > explain me the structure of a PST and the PSB (links to some documents,
> ...)?
> > The second thing: I could get the cpu- frequences that seem work (for my
> > FIDs) from my SSDT, but how can I calculate the voltage (for the VIDs)
> matching
> > the frequency, if there are only the mW given in the SSDT?
> > 
> 
> BTW, I send to CPUFreq ML yesterday a patch in order to get a sysctl
> interface for overwritting a powernow k7 table.
> 
> http://www.poupinou.org/cpufreq/powernow-k7/
> 
> Cheers,
> 
> -- 
> Bruno Ducrot
> 
> --  Which is worse:  ignorance or apathy?
> --  Don't know.  Don't care.
> 
> 
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> 

Sysctl? I just hard-coded a PST (thanks to your hint with the SSDT-
controldwords) and patched powernow-k7.c to make the driver use that PST instead of
BIOS PSTs. What shall I say? It simply works ;)

-Lukas-

PS.: I found one of the FIDs in the SSDT to be false, so maybe it's not save
to read the powernow- states from ACPI.

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