[U-Boot] How to boot a newer version of u-boot from a older one?

[McClintock Matthew-B29882]

On Tue, Jun 7, 2011 at 12:12 AM, Bear <jilingshu at gmail.com> wrote:
>> Once you have a working NAND, you can replace the NOR image, switching
>> back to NAND if the new NOR image is broken.
>>
>> And of course be careful not to write to the wrong flash, and destroy your
>> backup boot source.
>
> Thanks for your help. Now I have already wrote the newer version of
> u-boot into NAND Flash and boot from it!
> Do you mind me to ask some more questions?
> Where is environment stored? If I save the NAND-version u-boot's
> environment, will it overwrite the one of NOR-version u-boot?

Typically, when booting from NAND u-boot is configured to save the
environment to NAND. You can always type 'save' and usually u-boot
will print a message showing where the environment is saved. Double
check the CONFIG*ENV* defines in your u-boot config file.

-M