From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtpauth.hypersurf.com (smtpauth.hypersurf.com [209.237.0.8]) by ozlabs.org (Postfix) with ESMTP id C3E86DDFF9 for ; Sat, 7 Jun 2008 04:45:45 +1000 (EST) Received: from [192.168.1.37] (node146.76.251.72.1dial.com [72.251.76.146]) (authenticated bits=0) by smtpauth.hypersurf.com (8.14.2/8.14.2) with ESMTP id m56IheX5046361 for ; Fri, 6 Jun 2008 11:45:36 -0700 (PDT) Message-ID: <48498550.7040004@hypersurf.com> Date: Fri, 06 Jun 2008 11:43:28 -0700 From: Kevin Diggs MIME-Version: 1.0 To: linuxppc-dev@ozlabs.org Subject: 750GX Content-Type: text/plain; charset=ISO-8859-1; format=flowed List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi, In the 750GX data sheet (750GX_ds2-17-05.pdf), page 45 has Table 5-1 that describes the PLL range field. It goes something like this: PLL_RNG range 00 600 - 900 01 900 - 1000 10 500 - 600 Anyone have any thoughts as to what the correct values are for 600 and 900? I think I have this working. I was setting the range to 1 for all frequencies because I did: if(freq<600) instead of if(freq<600000) when building my frequency table. This cpufreq stuff definitely messes up the repeatability of my bogomazes value. kevin P.S.: I'd be interested in various theories as to what this does? P.P.S.: On page 341 of the 750GX user manual It says: "Turning the non selected PLL off results in a modest power savings ..." Regarding what goes on in idle_6xx.S, wouldn't this likely save more power than switching to a lower frequency (to clock mostly nothing since the processor is going into doze or nap)?