From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sentry.acdstar.com (mail.acdstar.com [209.98.244.9]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTP id E376EDDE16 for ; Sat, 21 Jul 2007 02:07:55 +1000 (EST) Received: from MailerDaemon by sentry.acdstar.com with local-bsmtp (Exim 4.63) (envelope-from ) id 1IBumj-0007dY-HA for linuxppc-embedded@ozlabs.org; Fri, 20 Jul 2007 10:52:53 -0500 Received: from [192.168.2.3] (port=60080 helo=mail.acdstar.com) by sentry.acdstar.com with esmtp (Exim 4.63) (envelope-from ) id 1IBumg-0007dP-0M for linuxppc-embedded@ozlabs.org; Fri, 20 Jul 2007 10:52:50 -0500 Received: from [192.168.2.105] (rnd-03.int.acdstar.com [192.168.2.105]) by mail.acdstar.com (8.13.6/8.13.6) with ESMTP id l6KFqM5R019889 for ; Fri, 20 Jul 2007 10:52:22 -0500 Message-ID: <46A0D76E.4030101@acdstar.com> Date: Fri, 20 Jul 2007 10:40:30 -0500 From: lokowich MIME-Version: 1.0 To: linuxppc-embedded@ozlabs.org Subject: SDRAM failures on MPC5200B Content-Type: multipart/alternative; boundary="------------050903060002030509050804" 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. --------------050903060002030509050804 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit We're working on bringing up a MPC5200B version of our original MPC5200 board using U-Boot 1.1.4 configured for Icecube/Lite5200B. Other than the CPU, the board is identical. The bootloader crashes just after relocation to RAM, often with a Program Check Exception, typically a memory corruption issue. I noticed failures at different stages after relocation based on content, suggesting problems with upper SDRAM. If I force the initram to 1/2 the determined size (64MB instead of 128MB), then everything works well through kernel load and initialization. We've added termination resistors to improve AD signals, to no avail. Memory tests work fine too. Any help is appreciated. Thanks, Mark Lokowich Systems Engineer Advanced Communication Design 7901 12th Ave. So. Bloomington, MN 55425 952-854-4000 lokowich@acdstar.com This email was Anti Virus checked by Astaro Security Gateway. http://www.astaro.com --------------050903060002030509050804 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit We're working on bringing up a MPC5200B version of our original MPC5200 board using U-Boot 1.1.4 configured for Icecube/Lite5200B.  Other than the CPU, the board is identical.  The bootloader crashes just after relocation to RAM, often with a Program Check Exception, typically a memory corruption issue.  I noticed failures at different stages after relocation based on content, suggesting problems with upper SDRAM.  If I force the initram to 1/2 the determined size (64MB instead of 128MB), then everything works well through kernel load and initialization.  We've added termination resistors to improve AD signals, to no avail.  Memory tests work fine too.  Any help is appreciated.

Thanks,
Mark Lokowich
Systems Engineer
Advanced Communication Design
7901 12th Ave. So.
Bloomington, MN 55425
952-854-4000
lokowich@acdstar.com
 
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