[PATCH] env: env_sf: don't set .init op if not needed

[Wolfgang Denk]

Dear Heiko,

In message <a80c8548-a8a5-fb98-f9e3-fc659c2bdfec at denx.de> you wrote:
>
> I enabled now ENV_APPEND on this board and
>
> CONFIG_ENV_IS_NOWHERE
> CONFIG_ENV_IS_IN_SPI_FLASH

This gives me the creeps.  I know this is not cause by anything in
your patch, but anyway...

Apparently the meaning of CONFIG_ENV_IS_NOWHERE is nowhere
documented :-(

But common sense says that "IS NOWHERE" means that there is no
storage defined for the environment.  I would expect, that Kconfig
does not even allow to enable any CONFIG_ENV_IS_IN_* when
CONFIG_ENV_IS_NOWHERE is selected - these are logically exclusive.

May I suggest that:

1) our Kconfig files are changed such that CONFIG_ENV_IS_NOWHERE and
   CONFIG_ENV_IS_IN_* are indeed exclusive, so that we adhere to the
   POLA [1] ?

2) for cases like this one, where there actually _is_ some storage
   defined, but it shall be used in a non-standard way, a new
   CONFIG_ option gets created that expresses in it's name what it
   does?

[1] https://en.wikipedia.org/wiki/Principle_of_least_astonishment

Thanks!

Best regards,

Wolfgang Denk

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