[PATCH] doc: board: renesas: Document Retronix R-Car Gen4 V4H Sparrow Hawk SPI NOR layout

Document the SPI NOR layout, placement of U-Boot bootloader,
U-Boot environment and optional PCIe controller firmware.

Signed-off-by: Marek Vasut <[email protected]>
---
Cc: Nobuhiro Iwamatsu <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: [email protected]
---
 doc/board/renesas/rcar-gen4-sparrow-hawk.rst | 21 ++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/doc/board/renesas/rcar-gen4-sparrow-hawk.rst b/doc/board/renesas/rcar-gen4-sparrow-hawk.rst
index a1b92ecab57..7d006a3d2b1 100644
--- a/doc/board/renesas/rcar-gen4-sparrow-hawk.rst
+++ b/doc/board/renesas/rcar-gen4-sparrow-hawk.rst
@@ -59,6 +59,27 @@ Finally, write U-Boot into SPI NOR:
 
     => sf probe && sf update 0x50000000 0 ${filesize}
 
+SPI NOR layout
+--------------
+
+The Retronix R-Car V4H Sparrow Hawk board 64 MiB SPI NOR layout is listed below.
+
+.. table:: Retronix R-Car Gen4 V4H Sparrow Hawk SPI NOR layout
+
+   +----------------+----------------+-----------+---------------------------------------------------------------+
+   | Start          | End            | Size      | Content                                                       |
+   +================+================+===========+===============================================================+
+   | ``0x000_0000`` | ``0x02f_ffff`` |  3072 kiB | U-Boot bootloader ``flash.bin``                               |
+   +----------------+----------------+-----------+---------------------------------------------------------------+
+   | ``0x030_0000`` | ``0x033_ffff`` |   256 kiB | PCIe controller firmware ``rcar_gen4_pcie.bin`` (32 kiB used) |
+   +----------------+----------------+-----------+---------------------------------------------------------------+
+   | ``0x034_0000`` | ``0x3f7_ffff`` | 61696 kiB | UNUSED                                                        |
+   +----------------+----------------+-----------+---------------------------------------------------------------+
+   | ``0x3f8_0000`` | ``0x3fb_ffff`` |   256 kiB | U-Boot bootloader environment copy 1                          |
+   +----------------+----------------+-----------+---------------------------------------------------------------+
+   | ``0x3fc_0000`` | ``0x3ff_ffff`` |   256 kiB | U-Boot bootloader environment copy 2                          |
+   +----------------+----------------+-----------+---------------------------------------------------------------+
+
 Bundle TFA BL31 into Linux kernel fitImage
 ------------------------------------------
 
-- 
2.53.0