[PATCH v4 8/9] fdt: update the document and Kconfig description

[Raymond Mao]

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 at linaro.org>
---
Changes in v4
- Refine the description.

 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..2b968a6b01 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, arch-specific routine and board-specific routine
+will provide the bloblist and devicetree respectively 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..ac6e1752bb 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 board custom function called board_fdt_blob_setup().
+	  If this option is enabled, bloblist is provided at runtime by an
+	  arch custom function called xferlist_from_boot_arg().
+	  An arch or board must implement these functions if it wishes to
+	  provide special behaviours.
 
 	  With this option, the device tree build by U-Boot may be overridden or
 	  ignored. See OF_HAS_PRIOR_STAGE.
-- 
2.25.1