From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Subject: Re: overclocking? Date: 30 Jun 2003 00:24:49 +0200 Sender: cpufreq-admin@www.linux.org.uk Message-ID: <1056925488.32576.100.camel@gaston> References: <20030629114243.31cd609f.rees_b@bigpond.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20030629114243.31cd609f.rees_b@bigpond.com> Errors-To: cpufreq-admin@www.linux.org.uk List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Content-Type: text/plain; charset="us-ascii" To: Rees Boffey Cc: cpufreq@lists.arm.linux.org.uk On Sun, 2003-06-29 at 05:42, Rees Boffey wrote: > in the cpufreq documenatation in my 2.4.21-benh kernel it mentions that > arguments echoed to the /proc/cpufreq entry are first validated before any > changes are made. my question is, is it possible to remove this validatio > to allow the overclocking of the cpu? > the ibook2.2 that i use is possible of being overclocked via software using > an early version of the CHUD tools for osx but as of yet i have not found a > way to do it under linux. > appreciate any replies/flames :) Well... some PowerMac models support only dual speeds (via PMU changing the PLL strapping & resetting the CPU). Some others (the 750FX based iBooks) could in theory be programmed to any speed supported by the PLL... Currently, I do not have code to take advantage of this "feature". Those chips have 2 PLLs and can switch instantly between them. One is setup for full speed, the other for "low speed" by the firmware, all I support via cpufreq so far is to switch between those 2 Ben.