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

[Otavio Salvador]

On Tue, Aug 6, 2013 at 2:12 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
> 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?

So that's the real goal to change it inside of code. This does make
sense to have a way to set it from outside.

-- 
Otavio Salvador                             O.S. Systems
http://www.ossystems.com.br        http://projetos.ossystems.com.br
Mobile: +55 (53) 9981-7854            Mobile: +1 (347) 903-9750