[U-Boot] [PATCH] wandboard: add pxe support, set default boot command like highbank

[Stephen Warren]

On 08/06/2013 10:58 AM, Otavio Salvador wrote:
> On Tue, Aug 6, 2013 at 1:54 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
>>> 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.
> 
> Ok but when I do env -f -d -a it uses the built-in environment as
> default. How can I 'change' this default without rebuilding U-Boot
> binary?

I don't believe you can. Why would you want to? It's the default
environment that makes sense for that board, and that's defined by the
person creating U-Boot.

If you want the user to be able to switch between different
environments, just have them save/load from a disk file that they
create. I think there's a command for that?