From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-yw0-x230.google.com ([2607:f8b0:4002:c05::230]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1c4DN8-0004TG-Dh for barebox@lists.infradead.org; Tue, 08 Nov 2016 20:51:59 +0000 Received: by mail-yw0-x230.google.com with SMTP id r204so195111618ywb.0 for ; Tue, 08 Nov 2016 12:51:38 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <20161108075317.j4xkf7zpkdfyt5y3@pengutronix.de> References: <20161104071821.jqrhtfmgz3432527@pengutronix.de> <20161107074346.pb4uivigwa5gbj6z@pengutronix.de> <20161108075317.j4xkf7zpkdfyt5y3@pengutronix.de> From: Jose Luis Zabalza Date: Tue, 8 Nov 2016 21:51:36 +0100 Message-ID: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: Configure RAM size on iMX53 board To: barebox@lists.infradead.org > So you have 512MiB on each chip select, so I assume that on the 512MiB > board variants CS1 is not equipped. Yes, it is. >In that case you can in lowlevel.c > test if you find SDRAM on CS1 and if not, disable the chip select > completely in the SDRAM controller. OK. But how ? I enable CS0 and CS1 on DCD table. Is there any way to tell barebox not to use CS1 ? > I am not sure how you can detect if there's SDRAM on CS1. I've seen > situations in which the board just hangs if you access non existent RAM > areas. I have tried it, but I have not be able to implement a code for autodetect. If the code write or read a value on a position without physical chip, the microcontroller hangs. ???? But it's not a problem. A solution is configure both CS and MMU. If bootloader don't access to high positions, there is not problem. After I set a environment variable with memory size and the mem kernel parameter (or ATAG) does the rest. So, I have to make sure Barebox don't reach CS1 memory positions. That is all. Thanks for your help. See you later. -- jlz.3008 a t gmail.com Linux Counter 172551 https://linuxcounter.net/cert/172551.png _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox