[PATCH 1/2] blspec: allow board files to overwrite config file settings

[Sascha Hauer]

Hi Marco,
On Mon, Jan 18, 2021 at 09:48:49PM +0100, Marco Felsch wrote:
> This commit adds the support to overwrite and/or adapt blspec config
> files by the following global variables:
>   - global.blspec.fixup.devicetree
>   - global.blspec.fixup.initrd
>   - global.blspec.fixup.options
>   - global.blspec.fixup.linux
>   - global.blspec.fixup.devicetree-overlay.
> 
> Overwriting blspec-config's shouldn't be the normal case but there are
> cases where this support is needed. One use-case can be a special
> handling during update. E.g. the normal boot-flow don't need the initrd
> but the update-flow uses it because the update system is on the initrd.

When you have an update system and a regular system on the same
filesystem then I would expect an additional bootspec entry for the
update system.

> Another use-case could be a dynamic devicetree-overlay handling. E.g.
> the board code dynamically checks which periphery boards are connected
> and adds the required overlays dynamically.

Board code can register overlays already, there's no need for bootspec
to do that.

Overall overwriting bootspec variables somewhat contradicts the whole
purpose of bootspec. I don't like that very much, so you'll need very
good reasons to get this through ;)

Regards,
 Sascha

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