From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 11929 invoked by alias); 21 Sep 2007 10:49:18 -0000 Received: (qmail 11921 invoked by uid 22791); 21 Sep 2007 10:49:18 -0000 X-Spam-Check-By: sourceware.org Received: from virtual.bogons.net (HELO virtual.bogons.net) (193.178.223.136) by sourceware.org (qpsmtpd/0.31) with ESMTP; Fri, 21 Sep 2007 10:49:11 +0000 Received: from jifvik.dyndns.org (jifvik.dyndns.org [85.158.45.40]) by virtual.bogons.net (8.10.2+Sun/8.11.2) with ESMTP id l8LAn8S04384 for ; Fri, 21 Sep 2007 11:49:08 +0100 (BST) Received: from [172.31.1.2] (unknown [172.31.1.2]) by jifvik.dyndns.org (Postfix) with ESMTP id 5C4A83FE4 for ; Fri, 21 Sep 2007 11:49:07 +0100 (BST) Message-ID: <46F3A1A2.6050606@jifvik.org> Date: Fri, 21 Sep 2007 10:49:00 -0000 From: Jonathan Larmour Reply-To: eCos discussion User-Agent: Mozilla Thunderbird 1.0.8-1.1.fc3.4.legacy (X11/20060515) MIME-Version: 1.0 To: eCos discussion Content-Type: multipart/mixed; boundary="------------020507030400030301040905" Mailing-List: contact ecos-discuss-help@ecos.sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: ecos-discuss-owner@ecos.sourceware.org Subject: [ECOS] [Fwd: AT91SAM7SE DMA with external SDRAM] X-SW-Source: 2007-09/txt/msg00117.txt.bz2 --------------020507030400030301040905 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-length: 26 This was misaddressed.... --------------020507030400030301040905 Content-Type: message/rfc822; name="AT91SAM7SE DMA with external SDRAM" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="AT91SAM7SE DMA with external SDRAM" Content-length: 3161 Return-Path: Received: from jifvik.dyndns.org ([unix socket]) by imap.jifvik.org (Cyrus v2.2.12-Invoca-RPM-2.2.12-1.1.fc3) with LMTPA; Fri, 21 Sep 2007 09:09:03 +0100 X-Sieve: CMU Sieve 2.2 Received: by jifvik.dyndns.org (Postfix, from userid 99) id 400DC3FE4; Fri, 21 Sep 2007 09:09:03 +0100 (BST) X-Original-To: jiflsw@jifvik.org Delivered-To: jifvikmail+jiflsw@localhost.jifvik.org Received: from mail0.rbsov.bogons.net (mail0.rbsov.bogons.net [85.158.43.12]) by jifvik.dyndns.org (Postfix) with ESMTP id AB3A13FE4 for ; Fri, 21 Sep 2007 09:08:58 +0100 (BST) Received: from sourceware.org ([209.132.176.174]) by mail0.rbsov.bogons.net with smtp (Exim 4.63) (envelope-from ) id 1IYdZC-0003yU-Rc for jiflsw@jifvik.org; Fri, 21 Sep 2007 09:08:58 +0100 Received: (qmail 12394 invoked by alias); 21 Sep 2007 08:08:44 -0000 Delivered-To: ecos-discuss-owner@ecos.sourceware.org Received: (qmail 12389 invoked by uid 22791); 21 Sep 2007 08:08:44 -0000 Received: from scanner-relay-corvus2.pulsation.fr (HELO scanner-relay-corvus2.pulsation.fr) (80.74.64.70) by sourceware.org (qpsmtpd/0.31) with SMTP; Fri, 21 Sep 2007 08:08:38 +0000 Received: (qmail 5169 invoked from network); 21 Sep 2007 08:08:34 -0000 Received: from relayauth-corvus2.pulsation.fr (80.74.64.67) by scanner-relay-corvus2.pulsation.fr with SMTP; 21 Sep 2007 08:08:34 -0000 Received: (qmail 5164 invoked from network); 21 Sep 2007 08:08:34 -0000 Received: from unknown (HELO KLKJCC) (jc.caquet@kerlink.fr@80.125.252.188) by relayauth-corvus2.pulsation.fr with SMTP; 21 Sep 2007 08:08:34 -0000 From: To: Subject: AT91SAM7SE DMA with external SDRAM Date: Fri, 21 Sep 2007 10:08:45 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: Acf8JqFOGTCM49xrT6evG/Dkjf8ThQ== X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 Message-Id: <20070921080858.AB3A13FE4@jifvik.dyndns.org> Envelope-to: jiflsw@jifvik.org X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on garibaldi.jifvik.org X-Spam-Level: ** X-Spam-Status: No, score=2.9 required=5.0 tests=AWL,BAYES_60, MSGID_FROM_MTA_ID,NO_REAL_NAME autolearn=no version=3.0.4 Content-length: 805 Dear all, we are facing a pb when sending data over serial link on AT91SAM7SE-EK board. We use external SDRAM connected on EBI, this SDRAM is OK as we made some intensive read/write tests over the whole memory. Ecos implementation of USART drivers use DMA (eg PDC) when sending characters, and since output buffer is located in SDRAM output characters are sometimes missing or sometimes replaced by another. We don't have any trouble when output buffer is located in internal SRAM, and we only have to send a few characters to see the pb. We checked that characters are still correct in SDRAM after transmission, and we also checked that the characters we read on the serial line are OK. Does anybody know if there are some restrictions/bugs when using DMA with external memory connected on EBI ? JC --------------020507030400030301040905 Content-Type: text/plain; charset=us-ascii Content-length: 148 -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss --------------020507030400030301040905--