[U-Boot] [PATCH V2 3/4] MX51: Add video support

[Stefano Babic <sbabic@denx.de>]

On 10/22/2010 05:54 AM, Liu Ying wrote:
> Hello, Stefano,

Hi Liu,

> 
> It looks that your framebuffer patch supports one framebuffer only on IPU DI0.

That is correct. As I stated in the commit message, the goal was to add
LCD support to allow to display a splashscreen in u-boot. On the board I
used to test, LCD is connected to DI0.

> Could you please consider to add the support for framebuffer on IPU
> DI1, as someone may design a board whose primary display device is
> connected with IPU DI1.

Well, now the driver is in mainline. Patches are welcome !

> And, it will be better if the following two points can be supported:
> 1) Two framebuffers on IPU DI0 and DI1 can be support at the same
> time, that is to say, users may see two pictures on two display
> devices respectively.

I understand this is a feature for Linux, but in u-boot ? Two
splashscreens at the same time ? At the moment I do not know a board in
u-boot managing two display and I do not see a reason.

> 2) IPU DP module supports to combine two layers. The overlay layer can
> have a smaller resolution than the bottom layer. And, color space
> conversion, color key, global alpha and local alpha are supported by
> DP, too. I 'm not sure if these features are really needed in u-boot
> or not.

All these features were dropped because they are not used in u-boot. We
have no GUI programming, and only a small subset of commands to manage
the display. I understand they are a bunch of important features in
Linux, but in my understanding we need in u-boot only to show more or
less fixed images.

Best regards,
Stefano Babic

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