From mboxrd@z Thu Jan 1 00:00:00 1970 From: Murray.Jensen at csiro.au Date: Tue, 13 Sep 2005 19:52:18 +1000 Subject: [U-Boot-Users] MPC8560 DDR controller In-Reply-To: Your message of "Fri, 09 Sep 2005 14:37:21 +0200" <43218201.4050504@anagramm.de> Message-ID: <26710.1126605138@gerd> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Fri, 09 Sep 2005 14:37:21 +0200, Clemens Koller writes: >> I can't really rule out some problem in the Linux virtual memory system > >Oh, I wouldn't blame the kernel in that case. 2.6.8 to 2.6.13 work really >fine over here. What linux do you use? We are using 2.6.13, with some patches from the ozlabs patch tracker. >If you would have the chance to have an ECCable >system you can pretty easily check the reliability of the DDR looking at >the ECC status registers. Unfortunately, this would require a board re-design. >There is a story around here (from a guy who did a DDR for MPC8540) >that you might have to put on really good capacitors on some of the >ddr vref voltages on the CPU side because something is bouncing there >more than you would expect... Thanks - we will take a look at them ... >You also might want to check what happens if you increase/decrease >supply voltages here and there... well... you know, all these EE tricks. Your response is very much appreciated. Cheers! Murray... -- Murray Jensen, CSIRO Manufacturing & Infra. Tech. Phone: +61 3 9662 7763 Locked Bag No. 9, Preston, Vic, 3072, Australia. Fax: +61 3 9662 7853 Internet: Murray.Jensen at csiro.au To the extent permitted by law, CSIRO does not represent, warrant and/or guarantee that the integrity of this communication has been maintained or that the communication is free of errors, virus, interception or interference. The information contained in this e-mail may be confidential or privileged. Any unauthorised use or disclosure is prohibited. If you have received this e-mail in error, please delete it immediately and notify Murray Jensen on +61 3 9662 7763. Thank you.