Usage of device-tree for blobs

[Simon Glass]

Hi Heinrich,

On Wed, 25 Aug 2021 at 02:05, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>
> Hello Simon,
>
> some boards like qemu-riscv64_defconfig do not use any device-tree at
> build time. A device-tree is only supplied at runtime by the prior boot
> stage (CONFIG_OF_PRIOR_STAGE=y).
>
> In doc/develop/devicetree/intro.rst you suggest to put binary blobs into
> the device-tree.
>
> Could you, please, update the documentation to explain how adding blobs
> to the device-tree works in the different scenarios depending on the
> values of:
>
> CONFIG_OF_EMBED
> CONFIG_OF_SEPARATE
> CONFIG_OF_BOARD
> CONFIG_OF_HOSTFILE
> CONFIG_OF_PRIOR_STAGE
>
> It would be especially important to understand how one can develop a
> board independent feature which works for all of these settings.
>
> Please, describe CONFIG_OF_PRIOR_STAGE in
> doc/develop/devicetree/control.rst.

Back to this original request, I've taken a crack at this and sent out a patch.

Regards,
SImon