[PATCH 04/11] doc: board: renesas: Document Renesas R-Car Gen3 H3/M3-W/M3-N ULCB board

[Marek Vasut]

Add document which clarifies how to build and install U-Boot on
Renesas R-Car Gen3 H3/M3-W/M3-N ULCB board.

Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
---
Cc: Nobuhiro Iwamatsu <iwamatsu at nigauri.org>
Cc: Tom Rini <trini at konsulko.com>
Cc: u-boot at lists.denx.de
---
 doc/board/renesas/index.rst          |  1 +
 doc/board/renesas/rcar-gen3-ulcb.rst | 49 ++++++++++++++++++++++++++++
 doc/board/renesas/renesas.rst        |  6 ++--
 3 files changed, 53 insertions(+), 3 deletions(-)
 create mode 100644 doc/board/renesas/rcar-gen3-ulcb.rst

diff --git a/doc/board/renesas/index.rst b/doc/board/renesas/index.rst
index eca06a13d0c..b9bbe1f82f6 100644
--- a/doc/board/renesas/index.rst
+++ b/doc/board/renesas/index.rst
@@ -11,6 +11,7 @@ Renesas
    build-env-aarch32
    build-env-aarch64
    rcar-gen3-salvator-x
+   rcar-gen3-ulcb
    rcar-gen3-install
    rcar-gen3-install-hf
    rzn1
diff --git a/doc/board/renesas/rcar-gen3-ulcb.rst b/doc/board/renesas/rcar-gen3-ulcb.rst
new file mode 100644
index 00000000000..88ec2276a36
--- /dev/null
+++ b/doc/board/renesas/rcar-gen3-ulcb.rst
@@ -0,0 +1,49 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Renesas R-Car Gen3 H3/M3-W/M3-N ULCB board
+==========================================
+
+- Renesas R-Car H3 ULCB board: https://elinux.org/R-Car/Boards/H3SK
+- Renesas R-Car M3-W ULCB board: https://elinux.org/R-Car/Boards/M3SK
+- Renesas R-Car M3-N ULCB board: https://elinux.org/R-Car/Boards/M3NSK
+
+Build U-Boot
+------------
+
+Please follow :doc:`Renesas 64-bit ARM SoC build environment setup <build-env-aarch64>`
+to correctly set up the build environment before attempting to build U-Boot.
+
+Clone up to date U-Boot source code and change directory into the
+newly cloned source directory:
+
+.. code-block:: console
+
+    $ git clone https://source.denx.de/u-boot/u-boot.git/
+    $ cd u-boot
+
+Configure U-Boot:
+
+.. code-block:: console
+
+    $ make rcar3_ulcb_defconfig
+
+Compile U-Boot:
+
+.. code-block:: console
+
+    $ make
+
+To speed up build process, -jN option can be passed to make to start
+multiple jobs at the same time, this is beneficial especially on SMP
+systems. The following example starts up to number of CPUs in the
+system jobs, which is the recommended amount:
+
+.. code-block:: console
+
+    $ make -j$(nproc)
+
+Install U-Boot
+--------------
+
+Please follow :doc:`Renesas R-Car Gen3 U-Boot installation <rcar-gen3-install>`
+to install U-Boot into HyperFlash.
diff --git a/doc/board/renesas/renesas.rst b/doc/board/renesas/renesas.rst
index 132605b0c33..7fcd0e455b3 100644
--- a/doc/board/renesas/renesas.rst
+++ b/doc/board/renesas/renesas.rst
@@ -91,7 +91,7 @@ Renesas is a SoC solutions provider for automotive and industrial applications.
      - rcar3_salvator-x_defconfig
 
    * -
-     - ULCB
+     - :doc:`ULCB <rcar-gen3-ulcb>`
      - R8A77951 (H3)
      - :doc:`arm64 <build-env-aarch64>`
      - rcar3_ulcb_defconfig
@@ -103,7 +103,7 @@ Renesas is a SoC solutions provider for automotive and industrial applications.
      - rcar3_salvator-x_defconfig
 
    * -
-     - ULCB
+     - :doc:`ULCB <rcar-gen3-ulcb>`
      - R8A77960 (M3-W)
      - :doc:`arm64 <build-env-aarch64>`
      - rcar3_ulcb_defconfig
@@ -115,7 +115,7 @@ Renesas is a SoC solutions provider for automotive and industrial applications.
      - rcar3_salvator-x_defconfig
 
    * -
-     - ULCB
+     - :doc:`ULCB <rcar-gen3-ulcb>`
      - R8A77965 (M3-N)
      - :doc:`arm64 <build-env-aarch64>`
      - rcar3_ulcb_defconfig
-- 
2.53.0