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

[Bear]

hi,
Thanks for your answer, I have solved this problem :)

On 100/6/7 下午 01:46, McClintock Matthew-B29882 wrote:
> 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
>