On 08/06/2013 10:18 AM, Otavio Salvador wrote:
On Tue, Aug 6, 2013 at 12:50 PM, Stephen Warren swarren@wwwdotorg.org wrote:
On 08/06/2013 05:37 AM, Wolfgang Denk wrote:
Dear Rob Herring,
In message CAL_JsqJTg4CVfk0o9hLd4ZVksj+DNEsKLjcv6T7-6F-=BR+J+Q@mail.gmail.com you wrote:
Why would you ever want to compile this into U-Boot at all? Then any changes you need to make mean compiling and installing a new U-Boot, which is something you normally don't want to do.
You may want to have factory default and "user" settings. Building in the factory settings would be one way to accomplish that.
No. Handling these independently, outside of the compiled U-Boot image is as easy, and much more flexible.
U-Boot is perfectly able to import such settings from text files (or text blobs stored somewhere, even attached to the U-Boot image, if you want), so just use the text files separately, instead of hard compiling them into the code.
In my case, I don't want to compile the environment into u-boot. But some people do as I copied my scripts from Tegra which has them built-in.
We have the *default* environment built-in, which is used when no valid environment is found in flash. If there's an environment in flash, it gets used rather than the built-in default.
How can someone 'overwrite' the default environment from system or when generating a FIT image?
If U-Boot is running, you can get back to the default environment by running exactly the commands you wrote below.
If you're flashing U-Boot, you could force it to use the default environment when it boots by erasing/corrupting the copy of the environment that's stored in flash (or wherever ENV_IS points) at the same time that you flash the new U-Boot binary.
The question of how to get the default environment when generating a FIT image doesn't make sense; generating a FIT image of something (kernel, initrd, DTB?) is entirely unrelated to the environment content that U-Boot uses when running.
I am interested in let my customers to revert back to a sane default running:
env -f -d -a saveenv