[PATCH v2 1/2] env: allow environment to be amended from control dtb

[Joe Hershberger]

On Wed, Apr 21, 2021 at 4:07 AM Rasmus Villemoes
<rasmus.villemoes at prevas.dk> wrote:
>
> It can be useful to use the same U-Boot binary for multiple purposes,
> say the normal one, one for developers that allow breaking into the
> U-Boot shell, and one for use during bootstrapping which runs a
> special-purpose bootcmd. Or one can have several board variants that
> can share almost all boot logic, but just needs a few tweaks in the
> variables used by the boot script.
>
> To that end, allow the control dtb to contain a /config/enviroment
> node (or whatever one puts in fdt_env_path variable), whose
> property/value pairs are used to update the run-time environment after
> it has been loaded from its persistent location.
>
> The indirection via fdt_env_path is for maximum flexibility - for
> example, should the user wish (or board logic dictate) that the values
> in the DTB should no longer be applied, one simply needs to delete the
> fdt_env_path variable; that can even be done automatically by
> including a
>
>   fdt_env_path = "";
>
> property in the DTB node.
>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>

Cool addition.

Acked-by: Joe Hershberger <joe.hershberger at ni.com>