Added OSPI NOR flash layout diagram, as well as example commands to flash
firmware to it.  Added OSPI boot mode pin setting.

Signed-off-by: Jonathan Humphreys <j-humphr...@ti.com>
---
 doc/board/ti/img/ospi_sysfw3.svg | 802 +++++++++++++++++++++++++++++++
 doc/board/ti/j784s4_evm.rst      |  28 ++
 2 files changed, 830 insertions(+)
 create mode 100644 doc/board/ti/img/ospi_sysfw3.svg

diff --git a/doc/board/ti/img/ospi_sysfw3.svg b/doc/board/ti/img/ospi_sysfw3.svg
new file mode 100644
index 00000000000..382867c6f4f
--- /dev/null
+++ b/doc/board/ti/img/ospi_sysfw3.svg
@@ -0,0 +1,802 @@
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Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; 
white-space: normal; overflow-wrap: normal;">ospi.phypattern(256k)</xhtml:div>
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white-space: normal; overflow-wrap: normal;">
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margin-bottom: 0px; padding: 12px; overflow: auto; color: rgb(64, 64, 64); 
text-align: start;">0x3FC0000</xhtml:pre>
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diff --git a/doc/board/ti/j784s4_evm.rst b/doc/board/ti/j784s4_evm.rst
index 5c4bd2c927d..2ffec3dbd3b 100644
--- a/doc/board/ti/j784s4_evm.rst
+++ b/doc/board/ti/j784s4_evm.rst
@@ -153,6 +153,31 @@ Image formats
 .. image:: img/dm_tispl.bin.svg
     :alt: tispl.bin format
 
+OSPI:
+-----
+ROM supports booting from OSPI from offset 0x0.
+
+Flashing images to OSPI NOR:
+
+Below commands can be used to download tiboot3.bin, tispl.bin, and
+u-boot.img over tftp and then flash those to OSPI at their respective
+addresses.
+
+.. prompt:: bash =>
+
+  sf probe
+  tftp ${loadaddr} tiboot3.bin
+  sf update $loadaddr 0x0 $filesize
+  tftp ${loadaddr} tispl.bin
+  sf update $loadaddr 0x80000 $filesize
+  tftp ${loadaddr} u-boot.img
+  sf update $loadaddr 0x280000 $filesize
+
+Flash layout for OSPI NOR:
+
+.. image:: img/ospi_sysfw3.svg
+  :alt: OSPI NOR flash partition layout
+
 R5 Memory Map
 -------------
 
@@ -262,6 +287,9 @@ section.
    * - SD
      - 0000
 
+   * - OSPI
+     - 0010
+
    * - EMMC
      - 0110
 
-- 
2.34.1

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