Hi Raymond, On Mon, 27 Nov 2023 at 12:53, Raymond Mao <raymond....@linaro.org> wrote: > > From: Simon Glass <s...@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 <s...@chromium.org> > Co-developed-by: Raymond Mao <raymond....@linaro.org> > Signed-off-by: Raymond Mao <raymond....@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
