From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262215AbVGFUPX (ORCPT ); Wed, 6 Jul 2005 16:15:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261718AbVGFUNw (ORCPT ); Wed, 6 Jul 2005 16:13:52 -0400 Received: from main.gmane.org ([80.91.229.2]:56749 "EHLO ciao.gmane.org") by vger.kernel.org with ESMTP id S262215AbVGFT5F (ORCPT ); Wed, 6 Jul 2005 15:57:05 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Bill Davidsen Subject: Re: speedstep-centrino on dothan Date: Wed, 06 Jul 2005 15:58:53 -0400 Message-ID: <42CC37FD.5040708@tmr.com> References: <20050706112202.33d63d4d@horst.morte.male> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: prgy-npn1.prodigy.com User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.6) Gecko/20050319 X-Accept-Language: en-us, en In-Reply-To: <20050706112202.33d63d4d@horst.morte.male> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org st3@riseup.net wrote: > Currently, the speedstep-centrino support has built-in frequency/voltage > pairs only for Banias CPUs. For Dothan CPUs, these tables are read from > BIOS ACPI. > > But ACPI encoding may not be available or not reliable, so why shouldn't we > provide built-in tables for Dothan CPUs, too? Intel has released this > datasheet: > > http://www.intel.com/design/mobile/datashts/302189.htm > > with frequency/voltage pairs for every version of Dothan CPUs. > > Moreover, I checked on Pentium M 725 and Pentium M 715 that the lowest > frequency at which the CPU can be set safely is not the 600MHz given in > datasheets, but 400MHz instead, with VID#A, VID#B, VID#C and VID#D (see > datasheet for more details) set to 0.908V. > > I can provide a patch, let me know. Slower is better, and not depending on ACPI for anything which can be gotten elsewhere is a good thing. Sounds like a good idea to me.