Re: [PATCH v3 8/9] fdt: update the document and Kconfig description

Hi Raymond,

On Fri, Dec 22, 2023 at 9:32 PM Raymond Mao raymond.mao@linaro.org wrote:

Update the document and Kconfig to describe the behavior of board specific custom functions when CONFIG_OF_BOARD is defined.

Signed-off-by: Raymond Mao raymond.mao@linaro.org

doc/develop/devicetree/control.rst | 6 +++--- dts/Kconfig | 7 +++++-- 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/doc/develop/devicetree/control.rst b/doc/develop/devicetree/control.rst index cbb65c9b17..e061f4e812 100644 --- a/doc/develop/devicetree/control.rst +++ b/doc/develop/devicetree/control.rst @@ -104,9 +104,9 @@ in u-boot.bin so you can still just flash u-boot.bin onto your board. If you are using CONFIG_SPL_FRAMEWORK, then u-boot.img will be built to include the device tree binary.

-If CONFIG_OF_BOARD is defined, a board-specific routine will provide the -devicetree at runtime, for example if an earlier bootloader stage creates -it and passes it to U-Boot. +If CONFIG_OF_BOARD is defined, board-specific routines will provide the +bloblist and devicetree at runtime, for example if an earlier bootloader stage +creates it and passes it to U-Boot.

If CONFIG_SANDBOX is defined, then it will be read from a file on startup. Use the -d flag to U-Boot to specify the file to read, -D for the diff --git a/dts/Kconfig b/dts/Kconfig index 00c0aeff89..12d61dc748 100644 --- a/dts/Kconfig +++ b/dts/Kconfig @@ -110,8 +110,11 @@ config OF_BOARD default y if SANDBOX || OF_HAS_PRIOR_STAGE help If this option is enabled, the device tree is provided at runtime by

•     a custom function called board_fdt_blob_setup(). The board must
  

•     implement this function if it wishes to provide special behaviour.
  

•     a custom function called board_fdt_blob_setup().
  

•     If this option is enabled, bloblist is provided at runtime by a
  

•     custom function called board_bloblist_from_boot_arg().
  

•     The board must implement these functions if it wishes to provide
  

•     special behaviour.
  

Again, this spec is not board-specific, so it should work on any ARM board, without board-specific code, just by enabling the feature.

      With this option, the device tree build by U-Boot may be overridden or
      ignored. See OF_HAS_PRIOR_STAGE.

-- 2.25.1

Regards, SImon