From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michele De Candia (VT) Date: Tue, 31 Mar 2009 18:00:48 +0200 Subject: [U-Boot] RAM Probing for ads5121rev4 In-Reply-To: <20090218090133.A3FC2832E43F@gemini.denx.de> References: <7c4b93310902180021o56da8320w2084e6a8c09c9509@mail.gmail.com> <20090218090133.A3FC2832E43F@gemini.denx.de> Message-ID: <49D23E30.4060205@valueteam.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Wolfgang Denk wrote: > Dear Emanuele Placidi, > > In message <7c4b93310902180021o56da8320w2084e6a8c09c9509@mail.gmail.com> you wrote: > >> In your opinion it is possible to probe the ram before initialize it? >> Unfortunately there are some rev4 which are equipped with different ram >> model. >> Examples are welcomed. >> > > It is a standard feature in U-Boot (and has always been right from > the start with PPCBoot nearly 10 years ago) that we auto-detected the > memory configuration on the boards, both for RAM and flash. Some > boards / architectures did not bother to implement this, but the > feature itself is present. > > The details depend on processor, memory controller properties, > specific RAM types used, etc. > > In case of the Micron/Elpida issue on the ADS5121, that should be not > too difficult to solve. > The issue concerns the possibility to identify DDR chips type (e.g. by VendorId) before initialize them. It doesn't concern configuration parameters (size, bus frequency, ecc..). There isn't a DDR command to read this information, do you think it is possible to solve this problem in other ways? > Best regards, > > Wolfgang Denk > > -- *Michele Jr **De Candia* ------------------------------------------------------------------------ Value Team Via Vespri Siciliani, 9 20146 Milano Tel. +39 0248985722 michele.decandia at valueteam.com http://www.valueteam.com CONFIDENTIALITY NOTICE -This message and its attachments (if any) may contain confidential, proprietary or legally privileged information and is intended only for the use of the addressee named above. No confidentiality or privilege is waived or lost by any mistransmission. If you are not the intended recipient of this message you are hereby notified that you must not use, disseminate, copy it in any form or take any action in reliance on it. If you have received this message in error please delete it and any copies of it and kindly inform the sender of this e-mail by replying or go to www.valueteam.com on 'contacts'.