doc: renesas: add Renesas board docs
As a starting point, list all currently supported Renesas boards.
For the RZ/N1 board, add details about booting and flashing.
Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/doc/board/renesas/renesas.rst b/doc/board/renesas/renesas.rst
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+.. SPDX-License-Identifier: GPL-2.0+
+
+Renesas
+=======
+
+About this
+----------
+
+This document describes the information about Renesas supported boards
+and their usage steps.
+
+Renesas boards
+--------------
+
+Renesas is a SoC solutions provider for automotive and industrial applications.
+
+U-Boot supports several Renesas SoC families:
+
+* R-Car Gen2 (32-bit)
+ - Blanche board
+ - Gose board
+ - Koelsch board
+ - Lager board
+ - Silk board
+ - Porter board
+ - Stout board
+* R-Car Gen3 (64-bit)
+ - Condor board
+ - Draak board
+ - Eagle board
+ - Ebisu board
+ - Salvator-X and Salvator-XS boards
+ - ULCB board
+* R-Car Gen4 (64-bit)
+ - Falcon board
+ - Spider board
+ - Whitehawk board
+* RZ/A1 (32-bit)
+ - GR-PEACH board
+* RZ/G
+ - Beacon-rzg2 board
+ - Hihope-rzg2 board
+ - ek874 board
+* RZ/N1 (32-bit)
+ - Schneider rzn1-snarc board