[U-Boot] [RFD] store env size in env area (+ cookie + len)

[Wolfgang Denk]

Dear Reinhard Meyer,

In message <4C63B262.8070004 at emk-elektronik.de> you wrote:
> 
> And env in EEPROM would benefit in speed if only the used space
> is written/read. A 16k ENV area in I2C EEPROM can take a few
> seconds to save if not tuned to max. speed.
> If the ENV uses just a few 100 Bytes, which it
> normally does, it would speed up saving (and reading).

This is an improvement that can be implemented independent from other
changes discussed here. Patches are welcome.

> <duck> one could also save the env in XML format... </duck>

Yes, or as a SQLite data base. There are many options. Not all of them
are really clever ones, though.

Best regards,

Wolfgang Denk

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