[U-Boot-Users] Delete all env vars except read onlys

[Wolfgang Denk]

In message <200802130921.38894.matthias.fuchs at esd-electronics.com> you wrote:
> 
> what about a 'scrubenv' or 'cleanenv' command that tries to unset all 
> variables leaving readonlys untouched.

Make this "clearenv", please.

> The command could request a confirmation:

No.

> => scrubenv
> Do you really want to do this ('yes' or 'no')? yes

No. Such code will not go into U-Boot.

"UNIX was not designed to stop you from doing stupid things,  because
that would also stop you from doing clever things."       - Doug Gwyn

> Can't overwrite "serial#"
> Can't overwrite "ethaddr"

I would not print such messages, especially since you aren't
overwriting these. If you want, print a similar warning as used by the
"erase" command for protected flash sectors, i. e. something like:

	=> cleanenv
	Warning: 5 protected variables will not be cleared
	=>

> What do you think?

Looks good to me...

Best regards,

Wolfgang Denk

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