[PATCH v2 15/18] fdt: Allow the devicetree to come from a bloblist

[Simon Glass]

Hi Raymond,

On Mon, 27 Nov 2023 at 12:53, Raymond Mao <raymond.mao at linaro.org> wrote:
>
> From: Simon Glass <sjg at chromium.org>
>
> Standard passage provides for a bloblist to be passed from one firmware
> phase to the next. That can be used to pass the devicetree along as well.
> If CONFIG_OF_BOARD is defined, a board custom routine will provide a
> bloblist or a specified memory address to retrieve the devicetree at
> runtime.
> A devicetree from a bloblist is prioritized than the one from specified
> memory region.
>
> Tests for this will be added as part of the Universal Payload work.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> Co-developed-by: Raymond Mao <raymond.mao at linaro.org>
> Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
> ---
> Changes in v2
> - New patch file created for v2.
>   Amended from the original patch
>   "[v2,30/32] fdt: Allow the devicetree to come from a bloblist".
>   Remove CONFIG_OF_BLOBLIST and FDTSRC_BLOBLIST, a DTB from a previous
>   loader is defined by CONFIG_OF_BOARD. The DTB can be located either in the
>   bloblist or from a specified memory address.
>
>  doc/develop/devicetree/control.rst |  8 +++--
>  dts/Kconfig                        |  9 ++++--
>  include/fdtdec.h                   |  3 +-
>  lib/fdtdec.c                       | 52 +++++++++++++++++++++++-------
>  4 files changed, 53 insertions(+), 19 deletions(-)

This is a bit mangled. I spoke to Ilias about this as osfc and thought
we had it figured out, but it was a bit rushed so perhaps not.

OF_BOARD refers to a board-specific mechanism

We should have OF_BLOBLIST to reference to this, a standard mechanism
and not board-specific.

Ideally all boards should use a bloblist to send their DT to U-Boot.
E.g. Raspberry Pi.

So I believe my original patch was closer to what we want.

Regards,
SImon