topic Re: U-Boot 'saveenv' command overwriting U-Boot? in i.MX Processors

U-Boot 'saveenv' command overwriting U-Boot?

DonaldR_PooleJr — Sat, 26 Nov 2011 00:40:12 GMT

Hello All,

I am running into a problem with u-boot (I'm using u-boot 2011.06). Every time I issue the 'saveenv' command to write my updated u-boot environment to flash (microSD), u-boot fails to load/start when I reset/power cycle the board. It's as though the 'saveenv' command is overwriting the u-boot in flash. I end up having to 'dd' the u-boot image back on the microSD card to get u-boot to start up again (losing my previous u-boot environment of course). Has anyone else encountered this problem with u-boot? If so, what do I need to do to resolve this issue? I'm pulling my hair out trying to find a solution.

Donald

Re: U-Boot 'saveenv' command overwriting U-Boot?

VladanJovanovic — Mon, 28 Nov 2011 07:09:46 GMT

Is it overwriting it? To what location is u-boot trying to save the environment, can you check that?

Shouldn't happen with u-boot delivered in binary demo release at least, is this your own build of u-boot?

Re: U-Boot 'saveenv' command overwriting U-Boot?

DonaldR_PooleJr — Mon, 28 Nov 2011 15:11:05 GMT

I'm not completely certain if u-boot is overwriting itself, but that's my best guess since the bootloader won't startup after I save the environment and power cycle the board. I'm not sure I where to look to find out where u-boot is saving the environment. Where would that information be? But, yes this is my own build of u-boot, version 2011.06. To make the u-boot iMX image, I followed the direction in the u-boot README doc (README.imximage) found in the 'doc' directory of the u-boot source (http://git.denx.de/u-boot.git/?p=u-boot.git;a=blob;f=doc/README.imximage;h=c74239d2ade911b76269b386caeac849a2c878d5;hb=HEAD)

Re: U-Boot 'saveenv' command overwriting U-Boot?

rlorriaux — Mon, 28 Nov 2011 18:34:53 GMT

Your U-Boot binary might be too large for some reason. You can change the location where the environment is saved in your configuration file, under u-boot-2009.08/include/configs/mx53_loco.h (assuming you are using the Quick Start Board). The setting is CONFIG_ENV_OFFSET. Make sure you adjust your U-Boot environment and the location where the kernel is to be flashed.

Re: U-Boot 'saveenv' command overwriting U-Boot?

DonaldR_PooleJr — Tue, 29 Nov 2011 20:25:54 GMT

Thanks Remi! I think that might resolve my issue. I will try this and see how things go.

Remi Lorriaux said:

Your U-Boot binary might be too large for some reason. You can change the location where the environment is saved in your configuration file, under u-boot-2009.08/include/configs/mx53_loco.h (assuming you are using the Quick Start Board). The setting is CONFIG_ENV_OFFSET. Make sure you adjust your U-Boot environment and the location where the kernel is to be flashed.