doc: board: Add missing board index.rst files
These board index.rst files are missing in previous html doc patch
series, hence it causes some build warnings. Add those files.
Reported-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/doc/board/AndesTech/index.rst b/doc/board/AndesTech/index.rst
new file mode 100644
index 0000000..d8f7d15
--- /dev/null
+++ b/doc/board/AndesTech/index.rst
@@ -0,0 +1,10 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Andes Tech
+==========
+
+.. toctree::
+ :maxdepth: 2
+
+ adp-ag101p
+ ax25-ae350
diff --git a/doc/board/atmel/index.rst b/doc/board/atmel/index.rst
new file mode 100644
index 0000000..8ba00fc
--- /dev/null
+++ b/doc/board/atmel/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Atmel
+=====
+
+.. toctree::
+ :maxdepth: 2
+
+ at91ek
diff --git a/doc/board/freescale/index.rst b/doc/board/freescale/index.rst
new file mode 100644
index 0000000..8d42b35
--- /dev/null
+++ b/doc/board/freescale/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Freescale
+=========
+
+.. toctree::
+ :maxdepth: 2
+
+ b4860qds
diff --git a/doc/board/renesas/index.rst b/doc/board/renesas/index.rst
new file mode 100644
index 0000000..34e62ba
--- /dev/null
+++ b/doc/board/renesas/index.rst
@@ -0,0 +1,10 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Renesas
+=======
+
+.. toctree::
+ :maxdepth: 2
+
+ sh7752evb
+ sh7753evb
diff --git a/doc/board/sifive/index.rst b/doc/board/sifive/index.rst
new file mode 100644
index 0000000..ad614c9
--- /dev/null
+++ b/doc/board/sifive/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+SiFive
+======
+
+.. toctree::
+ :maxdepth: 2
+
+ fu540
diff --git a/doc/board/xilinx/index.rst b/doc/board/xilinx/index.rst
new file mode 100644
index 0000000..2416fbd
--- /dev/null
+++ b/doc/board/xilinx/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Xilinx
+======
+
+.. toctree::
+ :maxdepth: 2
+
+ zynq