[U-Boot] Add video support for mx51evk

[Wolfgang Denk]

Dear Stefano Babic,

In message <4CD035F7.9070609 at denx.de> you wrote:
> 
> > And then the calculation depends only on the current setting - which
> > is _not_ board dependent.
> 
> Yes, calculation is not board dependent and must remain in lcd_setmem().
> What I meant as "board dependent" is really the LCD settings, in terms
> of display resolution and bits x pixel. The proposed wek function can
> set the panel_info structure, that lcd_setmem() uses for computation.

Why do we need a board dependent function for that? We can adjust the
setings by storing their value in an environment variable, say some-
thing like 800x600x16 at 60Hz or copying what Linux does with the "video-
mode=" boot argument (we already have drivers/video/videomodes.c).
That should be precise enough, and is completely bosrd-independent.


> > Boards would start with a (board dependent) default setting, though.
> 
> Yes. What we need is a way to get the board default setting to allow
> lcd_setmem() to compute the required memory.

Let's re-use existing interfaces (especially if we then can pass the
very same variable as boot argument to Linux).

Best regards,

Wolfgang Denk

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