[U-Boot] Add video support for mx51evk

[Wolfgang Denk]

Dear Stefano Babic,

In message <4CCFDEBA.2070203 at denx.de> you wrote:
>
> >> We could introduce a weak function, that a board maintainer can decide
> >> to implement or not. This maintains the compatibility with the most
> >> drivers where vpanel is static initialized.
> > 
> > In which way is this board dependent?
> 
> Because each board uses a different LCD with a different resolution, and
> this requires a different amount of memory. This is not different as we
> see in Linux, because the framebuffer properties are set in the board
> file before to be passed to the framebuffer driver.

Well, if _that_ was what we are using, the memory requirements were
fixed, and we could use compile-time constants.

But what you discussed before was the option to _switch_ resolutions,
so there has to be a way to select the cosen resolution (in an
environment variable?), and then this setting is used for the memory
calculations.

And then the calculation depends only on the current setting - which
is _not_ board dependent.

Boards would start with a (board dependent) default setting, though.

Best regards,

Wolfgang Denk

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