[Buildroot] [PATCH] u-boot: add option to generate env image from default env

[Denis OSTERLAND]

Hi Arnout,

Am Dienstag, den 09.10.2018, 10:01 +0200 schrieb Arnout Vandecappelle:
> 
> On 9/10/18 09:07, Denis OSTERLAND wrote:
> > 
> > pro:
> >  - clear on first look (not required to read help first)
>  This is a valid point.
> 
> > 
> >  - easier to extend (add other sources in future)
>  Hm, there is something to be said for this point as well. It might be possible
> that U-Boot will start shipping internal environment fragments.
> 
>  However, in that case, I think we would really want to add an additional list
> of internal sources, again without an option to control enabling it.
> 
> > 
> >  - keeps current behavior (failed to build, if only BR2_TARGET_UBOOT_ENVIMAGE is selected)
>  This is really not important.
> 
> 
> > 
> > I think it is not very likely that other sources were implemented.
> > Maybe it would be nice to just tick BR2_TARGET_UBOOT_ENVIMAGE and
> > empty default of SOURCE will lead to default env.
> > 
> > What do you think?
>  That is indeed what I meant.
so... you vote for empty list?

What about this?
        $(if $(BR2_TARGET_UBOOT_ENVIMAGE_DEFAULT), \
        CROSS_COMPILE="$(TARGET_CROSS)" $(@D)/scripts/get_default_envs.sh $(@D), \
        echo "") | cat - $(call qstrip,$(BR2_TARGET_UBOOT_ENVIMAGE_SOURCE)) \
                >$(@D)/buildroot-env.txt

Introduce a bool DEFAULT to enable read of compiled in env
and concatenate it with the files from SOURCES list.
> 
>  Regards,
>  Arnout
> 
Regards Denis

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