[PATCH 3/3] env: mmc: rework mmc_env_partition_by_guid() to work with two separate partitions

[Rasmus Villemoes]

Quentin Schulz <quentin.schulz at cherry.de> writes:

> Hi Rasmus,
>
> For this patch and the previous one, should we have test(s) to make
> sure we don't regress?
>

That's obviously a good idea. But I don't have any idea how I'd go about
writing such tests. AFAICT, there is no existing tests of the "find env
partition by GUID" logic that I could amend, or any tests of any of the
"find the mmc partition containing the env" for that matter. Pointers
appreciated.

FWIW, on my end, I think I'll enable CONFIG_PARTITION_TYPE_GUID on all
our configs and stop defining the real values of the ENV_OFFSET, so that
our boards will start depending on the guid logic to find the env
partitions. Which will then at least eventually find a regression, but
unfortunately we usually lag some months behind on upgrading, and very
rarely have resources for checking -rcX, so we would only find it after
a release.

Rasmus