[U-Boot] Copy environment variables to another board

[Wolfgang Denk]

Dear Giuseppe,

in message <4961D3D6.22933.3E9CEE at g.modugno.elettronika.it> you wrote:
> 
> I think the best solution is to use Linux on the source board to copy 
> the good U-Boot environment in a image file. On the destination 
> board, I can download (by tftp) the image and store it on the Flash 
> at the correct address. In this way, I'll use only U-Boot on the 
> destination board to retrieve the good environment. From that, I can 
> install kernel and root filesystem.

No, that is not a good idea, as this way you would also copy
board-specific settings lime serial number, MAC address etc.
> 
> > You could (and probaly should) put the constant part of your
> > definitions into the default environment, and use a script image for
> > the rest.
> 
> Just now I'm reading about the scripting capabilities of U-Boot. It's 
> interesting. Starting from which U-Boot version they are available?

They have been present forever in U-Boot. They were added in pretty
early stages of the PPCBoot project, many, many years ago.

> Just another question. I have two redundant U-Boot environments. 
> Should I copy both of them in two different images, or are they the 
> same and I can copy the first into the second?

These are the same except for the valid flag (one byte at offset 4).

Best regards,

Wolfgang Denk

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