[PATCH v5 3/5] env: Allow U-Boot scripts to be placed in a .env file

[Tom Rini]

On Mon, Oct 04, 2021 at 09:28:43AM +0200, Rasmus Villemoes wrote:

> On 02/10/2021 02.38, Simon Glass wrote:
> > At present U-Boot environment variables, and thus scripts, are defined
> > by CONFIG_EXTRA_ENV_SETTINGS. It is painful to add large amounts of text
> > to this file and dealing with quoting and newlines is harder than it
> > should be. It would be better if we could just type the script into a
> > text file and have it included by U-Boot.
> 
> Indeed, the pain of CONFIG_EXTRA_ENV_SETTINGS was part of the motivation
> for introducing CONFIG_USE_DEFAULT_ENV_FILE.
> 
> > Add a feature that brings in a .env file associated with the board
> > config, if present. To use it, create a file in a board/<vendor>/env
> > directory called <board>.env (or common.env if you want the same
> > environment for all boards).
> > 
> > The environment variables should be of the form "var=value". Values can
> > extend to multiple lines. See the README under 'Environment Variables:'
> > for more information and an example.
> > 
> > Comments are not permitted in the environment with this commit.
> 
> Perhaps some remarks on how this compares/relates to
> CONFIG_USE_DEFAULT_ENV_FILE and CONFIG_ENV_IMPORT_FDT would be in order?
> In particular, the latter seems like it could already do the "amend the
> environent per vendor/board" with appropriate settings in the
> -u-boot.dtsi files?
> 
> I don't think either of those currently support using CONFIG_ variables
> in the definitions, but perhaps that could be fixed.
> 
> I don't have anything against these patches as such, I'd just like to
> understand precisely what they bring that cannot already be done with
> existing mechanisms.

So, the high level requirement is to move the environment out of
the board.h file (or the nest of #includes that uses to cobble it
together).  That does mean that CONFIG_USE_DEFAULT_ENV_FILE at least
would likely need some tweaking, but may also be just not as useful, if
it's no longer such a pain to modify the default environment.

-- 
Tom
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