From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by yocto-www.yoctoproject.org (Postfix, from userid 118) id 3BF33E00965; Fri, 27 Mar 2015 06:17:33 -0700 (PDT) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on yocto-www.yoctoproject.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 X-Spam-HAM-Report: * -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high * trust * [135.245.210.21 listed in list.dnswl.org] * -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] X-Greylist: delayed 618 seconds by postgrey-1.32 at yocto-www; Fri, 27 Mar 2015 06:17:28 PDT Received: from smtp-fr.alcatel-lucent.com (fr-hpida-esg-02.alcatel-lucent.com [135.245.210.21]) by yocto-www.yoctoproject.org (Postfix) with ESMTP id 32C1DE00777 for ; Fri, 27 Mar 2015 06:17:28 -0700 (PDT) Received: from us70uusmtp4.zam.alcatel-lucent.com (unknown [135.5.2.66]) by Websense Email Security Gateway with ESMTPS id 7EE38E6420C90 for ; Fri, 27 Mar 2015 13:07:06 +0000 (GMT) Received: from umail.lucent.com (umail.ndc.lucent.com [135.3.40.61]) by us70uusmtp4.zam.alcatel-lucent.com (GMO) with ESMTP id t2RD77HB011632 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 27 Mar 2015 09:07:07 -0400 Received: from [135.222.138.133] (Ed-PC.mh.lucent.com [135.222.138.133]) by umail.lucent.com (8.13.8/TPES) with ESMTP id t2RD76wE022366 for ; Fri, 27 Mar 2015 08:07:06 -0500 (CDT) Message-ID: <551555DA.7040901@alcatel-lucent.com> Date: Fri, 27 Mar 2015 09:06:34 -0400 From: Ed Sutter User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: meta-freescale@yoctoproject.org References: <1427449171.3074.5.camel@perpic.it> In-Reply-To: <1427449171.3074.5.camel@perpic.it> Subject: Re: IMX53 Custom board, ram... X-BeenThere: meta-freescale@yoctoproject.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Usage and development list for the meta-fsl-* layers List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Mar 2015 13:17:33 -0000 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Andrea, A while back the first spin of our iMX6 based board had a bug that messed up the upper 16 bits or our 32-bit DRAM interface. I was able to temporarily run this as a single bank in 16 bit mode. This was not with yocto however. I would have to dig a bit to recall what I had to change (I don't think it was the file you're pointing to); let me know if you need that. Ed > Hello everybody, > > I would like to know what is the minimum requirement of ram that I need > to put on the board. > I saw for example that I can use MT41K128M16JT-125 XIT from Micron. > it looks like it is a 16 bit ram. > I know that for a project the ram usage is really low. It is a 16bit > ddr3. I didn't understand if I can use only 1 ram bank or if I need to > use (at least 2). On IMX53qsb there's 4 banks but reading: > http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/tree/include/configs/mx53_loco.h?h=imx_v2009.08 > it looks like that I can define CONFIG_NR_DRAM_BANKS to 1. 1 bank of > 32bit? or I can use 1 bank of 16bit? > > Thank you for the reading > Andrea -- Ed Sutter Alcatel-Lucent Technologies -- Bell Laboratories Phone: 908-582-2351 Email: ed.sutter@alcatel-lucent.com