From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.net4india.com (smtp.net4india.com [202.71.129.68]) by ozlabs.org (Postfix) with ESMTP id 81B7EDDECA for ; Thu, 10 May 2007 21:17:16 +1000 (EST) Received: from [61.95.204.104] (helo=signal-networks.com) by smtp.net4india.com with esmtp (Exim 4.54) id 1Hm6dy-0002Dp-SO for linuxppc-embedded@ozlabs.org; Thu, 10 May 2007 16:47:11 +0530 Received: from pjmaiya ([192.168.1.70]) by signal-networks.com (mail.signal-networks.com [192.168.1.1]) (MDaemon Standard v9.0.1) with ESMTP id md50000097485.msg for ; Thu, 10 May 2007 16:46:27 +0530 Message-ID: <010001c792f4$a5d3dfb0$4601a8c0@signet> From: "pjmaiya" To: Subject: RTC drift in PPC Date: Thu, 10 May 2007 16:46:25 +0530 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00FD_01C79322.BF7B79E0" List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This is a multi-part message in MIME format. ------=_NextPart_000_00FD_01C79322.BF7B79E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable hi, We are running RTC on mpc860 board with external crystal. During boot = we get date and time from h/w RTC chip and then it runs pn software = tick, which is handled by kernel. We are getting 4 minutes drift for 21 = hours. Can any one suggest, how to reduce the drift. thnax in advance, pjmaiya ------=_NextPart_000_00FD_01C79322.BF7B79E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

hi,

We are running RTC on mpc860 = board with=20 external crystal. During boot we get date and time from h/w RTC = chip and=20 then it runs pn software tick, which is handled by kernel. We are = getting 4=20 minutes drift for 21 hours. Can any one suggest, how to reduce the=20 drift.

thnax in advance,

pjmaiya

------=_NextPart_000_00FD_01C79322.BF7B79E0-- From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ruby.spiritone.com (ruby.spiritone.com [216.99.193.130]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTP id 3B145DDE1F for ; Fri, 11 May 2007 00:45:30 +1000 (EST) Message-ID: <46433008.5070508@BitWagon.com> Date: Thu, 10 May 2007 07:45:28 -0700 From: John Reiser MIME-Version: 1.0 To: pjmaiya Subject: Re: RTC drift in PPC References: <010001c792f4$a5d3dfb0$4601a8c0@signet> In-Reply-To: <010001c792f4$a5d3dfb0$4601a8c0@signet> Content-Type: text/plain; charset=ISO-8859-1 Cc: linuxppc-embedded@ozlabs.org List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , > We are running RTC on mpc860 board with external crystal... > We are getting 4 minutes drift for 21 hours. A slowdown in the approx. range 1:300 to 1:350 is endemic to linux ppc: http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=157581 -- From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from viefep20-int.chello.at (viefep18-int.chello.at [213.46.255.22]) by ozlabs.org (Postfix) with ESMTP id EC6BCDDE3D for ; Tue, 5 Jun 2007 17:44:55 +1000 (EST) Message-ID: <46651027.2010906@chello.nl> Date: Tue, 05 Jun 2007 09:26:31 +0200 From: Theo Gjaltema MIME-Version: 1.0 To: linuxppc-embedded@ozlabs.org Subject: Re: RTC drift in PPC References: <010001c792f4$a5d3dfb0$4601a8c0@signet> <46433008.5070508@BitWagon.com> In-Reply-To: <46433008.5070508@BitWagon.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , I 'v measured the clock on a mpc8280 board running the 2.4.25 kernel obtained from ELDK3.1.1, no problem with the clock during a test period of a few days. Theo. >> We are running RTC on mpc860 board with external crystal... >> We are getting 4 minutes drift for 21 hours. >> > > A slowdown in the approx. range 1:300 to 1:350 is endemic to linux ppc: > http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=157581 > >