[U-Boot] Add video support for mx51evk

[Wolfgang Denk]

Dear Stefano Babic,

In message <4CCFD2FB.6060000 at denx.de> you wrote:
>
> > Why cannot you determine the exact amount needed at runtime?
> 
> Agree, we can do it, and it is better - I do not think we need really to
> change dinamically (I mean, in the same u-boot session) the LCD
> connected to the framebuffer, reason that requires to reserve the
> maximum amount of memory.

Right. If we keep in mind the possibility to share the frame buffer
with Linux (to allow for a flicker-free display of a splash screen
loaded very early in U-Boot) we should stick with the memory map we
have: pRAM on top, frame buffer below, U-Boot code below, etc.  That
means that size changes for the frame buffer (like for pRAM) take only
effect after a reset.

> 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?

Best regards,

Wolfgang Denk

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