[U-Boot] [RFC PATCH] env: add default env size for CONFIG_ENV_IS_NOWHERE

[Wolfgang Denk]

Dear Bo Shen,

In message <5208DE04.1000405 at gmail.com> you wrote:
> 
> At first glance of CONFIG_ENV_IS_NOWHERE, I think no need to define the 
> CONFIG_ENV_SIZE, actually, it needs to define the CONFIG_ENV_SIZE. So, I 
> think add a default value will be better (Maybe another choice to add a 
> description in README file to specify how to use CONFIG_ENV_IS_NOWHERE).

I cannot see in which way the required environment size in this case
is different from all other cases.  To me, a default size makes little
sense - it is just a chance to miss setting a suitable value, so it
bites you later (at run time) instead of earlyin development.

> > In any cse, the needed environment seize if a pretty board specific
> > thing, and I think it makes sense to let the user define it.
> 
> Yes, the environment size is a pretty board specific thing. So, in this 
> patch, there is an option for user to define it.

I think the user should always set this to a useful (for him) value.
For example, you think 1 KiB is a useful size, I would think it is too
small. Ask two other people, and you will hear three other different
numbers.

Best regards,

Wolfgang Denk

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