[U-Boot] [PATCH 12/19] powerpc: ppc4xx: Use CONFIG_OF_CONTROL for canyonlands boards

[Simon Glass]

Hi Stefan,

On 26 January 2015 at 06:17, Stefan Roese <sr at denx.de> wrote:
> On 15.12.2014 15:19, Simon Glass wrote:
>>
>> Enable CONFIG_OF_CONTROL so that U-Boot on these three boards uses a
>> device
>> tree for its configuration.
>>
>> Signed-off-by: Simon Glass <sjg at chromium.org>
>
>
> This need further work on the ppc4xx platforms to get it booting from flash.
> As now the dtb is appended to the "normal" U-Boot image. And this image is
> fine-tuned to fit into currently 512KiB. With the last word (reset vector of
> the ppc4xx) located at 0xffff.fffc. So we need to include this dtb into the
> image this way:
>
> 0xfff8.0000     U-Boot code / text etc
> ...
>                 dtb
> 0xffff.fffc     reset vector
>
> Looking for the current options shows that perhaps CONFIG_OF_EMBED seems to
> be exactly what we are need. I'll got it working on Canyonlands after a bit
> of debugging. I'll post the necessary small patches soon...

Sounds good, thanks!

It almost feels like you should have a mkimage image for this, to
create a 512KB blob from u-boot.bin and u-boot.dtb. There must be
linker magic to make this all hold together. But yes the embed option
will build it in, so avoiding that.

Regards,
Simon