From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by yocto-www.yoctoproject.org (Postfix, from userid 118) id 0133DE00815; Tue, 27 Jan 2015 14:35:37 -0800 (PST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on yocto-www.yoctoproject.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 X-Spam-HAM-Report: * -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low * trust * [193.201.172.118 listed in list.dnswl.org] * 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider * (picmaster[at]mail.bg) * -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's * domain * 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily * valid * -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature Received: from mx2.mail.bg (mx2.mail.bg [193.201.172.118]) by yocto-www.yoctoproject.org (Postfix) with ESMTP id A6660E00753 for ; Tue, 27 Jan 2015 14:35:31 -0800 (PST) Received: from [192.168.0.40] (unknown [93.152.143.60]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx2.mail.bg (Postfix) with ESMTPSA id 5FFD96000B65; Wed, 28 Jan 2015 00:35:30 +0200 (EET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mail.bg; s=default; t=1422398130; bh=PIkrI8KeW0A21Up3sRBlRJZFlJvEooEbn0xYn4WTEus=; h=Message-ID:Date:From:MIME-Version:To:CC:Subject:References: In-Reply-To:Content-Type:Content-Transfer-Encoding; b=qwfygthxf7t2FNPS78LWKoFEkRuR9N+7AI+5lJO2Mm3O8MnWEjBB7tTEaba+5c5Ro VXCaogiYFm+WwuG33VIi3xE9JmkkY86HhsInAUzJ9+8xFEf6+GDQxM6JpSk1rhxPCM lAk50zax9oqO/7GRI5ptME6jx+6xY31ROKgnYlwM= Message-ID: <54C812B2.8020606@mail.bg> Date: Wed, 28 Jan 2015 00:35:30 +0200 From: Nikolay Dimitrov User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.4.0 MIME-Version: 1.0 To: =?UTF-8?B?RXJpYyBCw6luYXJk?= References: <54C16AB6.20605@mail.bg> <54C2B900.8000807@mail.bg> <54C74EE4.8070308@mail.bg> <54C7BC84.90104@mail.bg> <02BDCB585301A044B5DBBDB58DDFDA01188D46@dor-sms-xch01.digi.com> <54C7F3B3.3080409@mail.bg> <20150127215135.6138c753@e6520eb.localdomain> In-Reply-To: <20150127215135.6138c753@e6520eb.localdomain> Cc: "meta-freescale@yoctoproject.org" , Otavio Salvador Subject: Re: imx6 silent memory corruption 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: Tue, 27 Jan 2015 22:35:38 -0000 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Hi Eric, On 01/27/2015 10:51 PM, Eric Bénard wrote: > Hi Nikolay, > > Le Tue, 27 Jan 2015 22:23:15 +0200, > Nikolay Dimitrov a écrit : >> On 01/27/2015 07:40 PM, Gonzalez, Alex wrote: >>> Nikolay, >>> >>> Assuming this is a custom board, if you are using different memory or with a different configuration from the reference designs, you may need to change the memory calibration to suit the hardware. Freescale support can provide an application note that explains how to perform the calibration over a representative sample of boards. >> >> Yes, this is a custom board. I've already did the DDR3 calibration for >> this design and validated it with 48h testing with the Freescale DDR >> stress test tool (available on the IMX Community site). >> > are you sure of the stability of your power supplies under loard (not > only the memories' one) ? Hmm, very good question. I haven't attached a scope to the voltage rails, but that can be done easily. What would you advice for considering as an acceptable voltage noise amplitude on the CPU rails? Kind regards, Nikolay PS: FYI - my board uses 12V @ about 1-1.2A, and it's supplied by Instek PSP-2010, which is capable of delivering up to 10A (but the protection is usually configured for 2A as a safety precaution). The on-board SMPS is MMPF0100, which supplies all the digital subsystems.