doc: arm: MPS4 Corstone-320

Add documentation for MPS4 board.

Signed-off-by: Sudan Landge <sudan.landge@arm.com>

boards/arm/mps4/doc/index.rst

@@ -0,0 +1,132 @@
+.. zephyr:board:: mps4
+
+Overview
+********
+
+The MPS4 board configuration is used by Zephyr applications that run
+on the MPS4 board.
+
+`Corstone-320 FVP`_ is an Arm reference subsystem for
+secure System on Chips containing an Armv8.1-M Cortex-M85 processor,
+LCM, KMU and SAM IPs and, an Ethos-U85 neural network processor.
+They are available free of charge for Linux and Windows systems.
+The FVPs have been selected for simulation since they provide access to the
+Ethos-U85 NPU, which is unavailable in QEMU or other simulation platforms.
+
+
+Zephyr board options
+====================
+
+.. tabs::
+
+  .. tab:: MPS4 Corstone-320 (FVP)
+
+   The MPS4 FVP is an SoC with Cortex-M85 architecture. Zephyr provides support
+   for building for both Secure and Non-Secure firmware.
+
+   The BOARD options are summarized below:
+
+   +-------------------------------+-----------------------------------------------+
+   |   BOARD                       | Description                                   |
+   +===============================+===============================================+
+   | ``mps4/corstone320/fvp``      | For building Secure (or Secure-only) firmware |
+   +-------------------------------+-----------------------------------------------+
+   | ``mps4/corstone320/fvp/ns``   | For building Non-Secure firmware              |
+   +-------------------------------+-----------------------------------------------+
+
+   FPGA Usage:
+    - N/A.
+
+   FVP Usage:
+    - To run with the FVP, first set environment variable ``ARMFVP_BIN_PATH`` before using it. Then you can run it with ``west build -t run``.
+
+    .. code-block:: bash
+
+       export ARMFVP_BIN_PATH=/path/to/fvp/directory
+       west build -b {BOARD qualifier from table above} samples/hello_world -t run
+
+   To run the Fixed Virtual Platform simulation tool you must download "FVP model
+   for the Corstone-320 MPS4" from Arm and install it on your host PC. This board
+   has been tested with version 11.27.25 (Sep 24 2024).
+
+   QEMU Usage:
+    - N/A.
+
+.. note::
+
+   - Board qualifier must include the variant name as mentioned above.
+     ``mps4/corstone320`` without the variant name is not a valid qualifier.
+   - ``mps4/corstone320/fvp/ns`` variant needs latest upstream TF-M release since Zephyr's current
+     TF-M doesn't support Corstone-320 FVP yet.
+
+Hardware
+********
+
+No H/W available yet, only ARMFVP simulated board variants are supported for now.
+
+Supported Features
+===================
+
+.. zephyr:board-supported-hw::
+
+Serial Port
+===========
+
+The MPS4 has six UARTs. The Zephyr console output by default, uses
+UART0.
+
+Serial port 0 on the Debug USB interface is the MCC board control console.
+
+Serial port 1 on the Debug USB interface is connected to UART 0.
+
+Serial port 2 on the Debug USB interface is connected to UART 1.
+
+Serial port 3 on the Debug USB interface is connected to UART 2.
+
+.. Programming and Debugging:
+
+Programming and Debugging
+*************************
+
+Flashing
+========
+
+- N/A since the only support available is FVP.
+
+Building an application with Corstone-320
+-----------------------------------------
+
+You can build applications in the usual way. Here is an example for
+the :zephyr:code-sample:`hello_world` application with Corstone-320.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: mps4/corstone320/fvp
+   :goals: run
+
+Run with FVP and you should see the following message:
+
+.. code-block:: console
+
+   Hello World! mps4
+
+For more details refer to:
+ - `Corstone SSE-320 Reference Guide`_
+ - `Cortex M85 Generic User Guide`_
+ - `Arm Corstone-320 Reference Package Technical Overview`_
+ - `Arm MPS4 FPGA Prototyping Board Technical Reference Manual`_
+
+.. _Corstone-320 FVP:
+   https://developer.arm.com/tools-and-software/open-source-software/arm-platforms-software/arm-ecosystem-fvps
+
+.. _Corstone SSE-320 Reference Guide:
+   https://developer.arm.com/documentation/109760/0000/
+
+.. _Cortex M85 Generic User Guide:
+   https://developer.arm.com/documentation/101924/latest
+
+.. _Arm Corstone-320 Reference Package Technical Overview:
+   https://developer.arm.com/documentation/109761/0000/
+
+.. _Arm MPS4 FPGA Prototyping Board Technical Reference Manual:
+   https://developer.arm.com/documentation/102577/0000/