[U-Boot] SPL and an LCD splash screen on AM335x

[U-Boot] SPL and an LCD splash screen on AM335x

[Andy Pont]

Hello!

We are currently working on the specification for a project using the TI
AM335x where the overall system boot time has to be reduced as far as
possible.  In order to achieve that I am proposing that we implement a board
specific spl_start_uboot() function which under normal circumstances U-Boot
SPL will load the Linux kernel directly. 

One of the other requirements is to "display a splash screen logo on the LCD
as early in the boot process as possible".  Is it possible to get U-Boot SPL
to do that or will we always have to boot through U-Boot or see if we can
get the Linux kernel to do it as early as possible?

Thoughts and ideas welcome.

Andy.

[U-Boot] SPL and an LCD splash screen on AM335x

[Heshsham Abdul Basit]

Hi Andy,

I also tried to boot Linux directly on my Zynq board. But I could not
understand the instructions given in readme.falcon, so the project is
stalled.

google *falcon mode U-boot , *you will find couple of presentations, and in
doc you have readme.falcon.txt  that explains this with an example.

Since I also want to continue on this, so let us continue this discussion.


Thanks and regards,

Abdul Basit


On 30 July 2014 12:13, Andy Pont <andy.pont@sdcsystems.com> wrote:

> Hello!
>
> We are currently working on the specification for a project using the TI
> AM335x where the overall system boot time has to be reduced as far as
> possible.  In order to achieve that I am proposing that we implement a
> board
> specific spl_start_uboot() function which under normal circumstances U-Boot
> SPL will load the Linux kernel directly.
>
> One of the other requirements is to "display a splash screen logo on the
> LCD
> as early in the boot process as possible".  Is it possible to get U-Boot
> SPL
> to do that or will we always have to boot through U-Boot or see if we can
> get the Linux kernel to do it as early as possible?
>
> Thoughts and ideas welcome.
>
> Andy.
>
>
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
>

[U-Boot] SPL and an LCD splash screen on AM335x

[Stefano Babic]

Hi Andy,

On 30/07/2014 08:43, Andy Pont wrote:
> Hello!
> 
> We are currently working on the specification for a project using the TI
> AM335x where the overall system boot time has to be reduced as far as
> possible.  In order to achieve that I am proposing that we implement a board
> specific spl_start_uboot() function which under normal circumstances U-Boot
> SPL will load the Linux kernel directly. 

Of course: spl_start_uboot() is the board specific function that decides
to load either kernel or u-boot.

> 
> One of the other requirements is to "display a splash screen logo on the LCD
> as early in the boot process as possible".  Is it possible to get U-Boot SPL
> to do that or will we always have to boot through U-Boot or see if we can
> get the Linux kernel to do it as early as possible?

This is against the concept. Falcon boot is thought to start the kernel
as fast as possible, removing most of the stuff that belongs to u-boot.

The goal is reached in another way: booting the kernel faster let that
the framebuffer/drm driver in kernel is initialized very soon, and you
have to provide your logo during kernel boot.

Best regards,
Stefano Babic

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