From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergey Lapin Date: Tue, 13 Dec 2011 11:08:10 -0500 Subject: [U-Boot] Segmented RAM, big userspace. Message-ID: <20111213160810.GA27440@build.ihdev.net> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi, all! We have a board, based on s3c2416, with 128MB of RAM and 1GB of NAND flash. RAM is organized as 2 memory banks with far placed bases: TOP UNUSED 64MB 64MB SDRAM --- 128MB segment base 1 ----- UNUSED 64MB 64MB SDRAM -- 128MB segment base 0 ------ BOTTOM So we could have only 64MB as one piece; Due to u-boot reloaction code we need to have u-boot in first 64MB also. And now we have root filesystem which we need to flash using u-boot, which is a little over this 64MB limit. Is there some way to use second memory bank from u-boot? Is it possible to tftp file in parts and flash it on NAND in parts? (This requires handling of bad blocks too) We need to flash using u-boot, that's requirement for speedy production. It is possible to flash filesystems in parts, but for this to work these are needed to be properly split. This raises a problem of bad blocks - writing previous piece might end not where you expect it to end, but a few blocks later. Hand-handling this case is too error-prone. Thanks a lot, S.