[U-Boot] [PATCH] Add splash screen support via loading from flash

[Eric Nelson <eric.nelson@boundarydevices.com>]

Hi Stefano,

On 06/04/2013 07:15 AM, Stefano Babic wrote:
> Hi Eric,
>
> On 04/06/2013 15:55, Eric Nelson wrote:
>> Hi Stefano,
>>
>> On 06/04/2013 06:44 AM, Stefano Babic wrote:
>>> Hi Robert,
>>>
>>> On 03/06/2013 18:34, Robert Winkler wrote:
>>>
>>>>> Which is the advantage instead of using the "preboot" variable setting
>>>>> CONFIG_PREBOOT ? It does pretty the same and you can move the whole
>>>>> script outside of board code.
>>>>
>>>> The preboot command is run too late.  It looks like it is run in
>>>> main_loop but U-Boot looks for the splash image
>>>> at the address in the splashimage variable in board_init_r ->
>>>> stdio_init -> drv_lcd_init or drv_video_init (depending on
>>>> whether you have CONFIG_LCD or CONFIG_VIDEO).
>>>
>>> You are describing a bug - then it should be fixed globally, not only
>>> for this board.
>>>
>>
>> What's the bug?
>>      - preboot being called too late, or
>
> preboot is not called too late. The behavior is correct and wanted, as
> the name says, and the variable is evaluated during the main loop before
> booting. My suggestion comes because it is possible to implement a
> splashscreen (even if the name can be misleading..), setting preboot to
> something like "nand read <address> <offset>;bmp display <address>".
> In your case (with a bmp image), it could be:
> 	"preboot=if sf probe ; then " \
> 		"sf read ${splashimage} c2000 ${splashsize} ; bmp display
> ${splashimage}; fi\0"
>
> The behavior is exactly as the subject in the patch, the delay is from
> power-on until main loop is called. It can be on some boards acceptable,
> sometimes not.
>

Gotcha. This method doesn't involve splash_screen_prepare() though.

It also will blink the display since the splash screen will paint
after the the compiled-in logo case.
	http://git.denx.de/u-boot.git/?p=u-boot.git;a=blob;f=common/lcd.c#l1085

>>      - splash_screen_prepare() being called too early
>>
>> It seems that having splash_screen_prepare() called early
>> makes sense, because stdout could be set to include VGA
>> and having access to stdout is very useful in preboot
>> commands.
>
> You mention that it does not work, and then I assume that it is a bug,
> because an image should be displayed. But again, if it does not work,
> the issue is related to the video subsystem and should be fixed there
> and not in board code - this is my point.
>

This works with Robert's latest patch, which implements 
splash_screen_prepare() for boards that use cfb_console.

It just wasn't implemented there.

Regards,


Eric