From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ducrot Bruno Subject: Re: _PDC method in DSDT Date: Mon, 23 Jun 2003 12:07:44 +0200 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20030623100744.GU19556@poupinou.org> References: <1056329130.10322.36.camel@aldebaran.caltech.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1056329130.10322.36.camel-cfibRQahR+cF6I9xFAAkN5QCsf4PZ8us@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: David Moore Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Sun, Jun 22, 2003 at 05:45:31PM -0700, David Moore wrote: > Hi, > > Does anyone know the purpose or specification of the _PDC method of the > DSDT? It's a reserved method that exists on my laptop (a Dell Latitude > D600) but does not seem to be documented in the ACPI specification on > the web. > > The reason I ask is that I'm interested in porting the cpufreq driver > for Enhanced Speedstep to ACPI. Right now, the cpufreq driver has the > tables of proper MSR register values encoded into the source, but a more > elegant solution would be to get this information from ACPI. In my DSDT > source I notice that when the _PDC method is called properly, the _PCT > method will return FixedHardware addresses for the Enhanced Speedstep > MSRs instead of its normal SystemIO ports. To get this to work on more > than just my system, I should probably use the proper specification for > calling _PDC rather than just making it work. > > Anyone have any suggestions? > Too late... A CPUFreq driver is already writen and is in the CPUFreq cvs. -- Ducrot Bruno -- Which is worse: ignorance or apathy? -- Don't know. Don't care. ------------------------------------------------------- This SF.Net email is sponsored by: INetU Attention Web Developers & Consultants: Become An INetU Hosting Partner. Refer Dedicated Servers. We Manage Them. You Get 10% Monthly Commission! INetU Dedicated Managed Hosting http://www.inetu.net/partner/index.php