From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Denk Date: Sat, 31 Jan 2004 18:12:47 +0100 Subject: [U-Boot-Users] environment not being used In-Reply-To: Your message of "29 Jan 2004 19:48:37 EST." <1075423717.18221.233.camel@localhost.localdomain> Message-ID: <20040131171252.96147C112A@atlas.denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de In message <1075423717.18221.233.camel@localhost.localdomain> you wrote: > > To get around this, we have a small program which is stored in FPGA > bitstream and runs in FPGA on-chip memory (called BRAM). This program > copies u-boot binary image from flash to sdram and jumps to it. This > allows U-boot to run. However the problem is that the environment > variables saved in flash are not being used even though U-boot has been > configured with the CFG_ENV_IS_IN_FLASH option turned on. > CFG_FLASH_BASE has been set to the flash base address of u-boot and when > I use saveenv the environment is saved at the proper offset > CFG_ENV_OFFSET. The only thing thats a bit different for my U-boot > configuration is that CFG_MONITOR_BASE is set to the sdram base address > where U-boot starts executing from instead of being set to > CFG_FLASH_BASE. Normally U-Boot attempts to read the environment when starting from the same position in memory where it will save it to when you issue a "saveenv" command. You will have to modify U-Boot such that the initialization reads from the "fixed" copy in RAM, while "saveenv" saves to the address in flash, performing the 16-bit-expansion needed for your setup. It seems obvious that a plain copy as usuall cannot work on your system. Best regards, Wolfgang Denk -- See us @ Embedded World, Nuremberg, Feb 17 - 19, Hall 12.0 Booth 440 Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de Drun'? 'm not drun'! You woudn' dare call m' drun' if I was sober! - Terry Pratchett, _Men at Arms_