[U-Boot] [RFC 3/4] env: Create an environment transition method

[Wolfgang Denk]

Dear Maxime,

In message <20171025122601.28224-4-maxime.ripard at free-electrons.com> you wrote:
> The current environment has been hardcoded to an offset that starts to be
> an issue given the current size of our main U-Boot binary.
> 
> Introduce an environment method from storing the environment raw in the MMC
> to a file in a FAT partition. Eventually, and hopefully before we reach
> that limit again, we will have most of our users using that setup, and
> we'll be able to retire the raw environment, and gain more room for the
> U-Boot binary.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
> ---
>  cmd/nvedit.c                   |  1 +
>  env/Kconfig                    | 12 ++++++---
>  env/Makefile                   |  1 +
>  env/sunxi-transition.c         | 59 ++++++++++++++++++++++++++++++++++++++++++
>  include/configs/sunxi-common.h |  2 +-
>  include/environment.h          |  1 +
>  6 files changed, 72 insertions(+), 4 deletions(-)
>  create mode 100644 env/sunxi-transition.c

I wonder why you need such a lot of code, and especiallay many
changes in global files for a feature which is probably of no use to
anybody else.

Can the same not be acchieved by a little scripting and clever use of
"env export", file write, and "env import" commands?

Such scripting would have a lot of benefits: no need to touch any
code (especially not global code), and you don't need a new
version of U-Boot to "fix" all existing systems.

I guess I must be missing some key requirement but I can't see it?

Best regards,

Wolfgang Denk

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