.. _mimx8ml_evk:

NXP MIMX8MP EVK
###############

Overview
********

i.MX8M Plus EVK board is based on NXP i.MX8M Plus applications
processor, composed of a quad Cortex®-A53 cluster and a single Cortex®-M7 core.
Zephyr OS is ported to run on the Cortex®-M7 core.

- Board features:

  - RAM: 6GB LPDDR4
  - Storage:

    - SanDisk 32GB eMMC5.1
    - Micron 32MB QSPI NOR
    - microSD Socket
  - Wireless:

    - WiFi: 2.4/5GHz IEEE 802.11b/g/n/ac
    - Bluetooth: v4.2
  - USB:

    - USB 3.0 Type C for Power
    - USB 3.0 Type A
    - USB 3.0 Type C
  - 2x 10/100/1000 Ethernet (1x w/ TSN)
  - PCI-E M.2
  - Connectors:

    - 40-Pin Dual Row Header
  - LEDs:

    - 1x Power status LED
    - 1x UART LED
  - Debug

    - JTAG connector
    - MicroUSB for UART debug, two COM ports for A53 and one for M7

.. image:: img/I.MX8MPLUS-PLUS-EVK-TOP.png
   :width: 720px
   :align: center
   :height: 405px
   :alt: MIMX8MP EVK

More information about the board can be found at the
`NXP website`_.

Supported Features
==================

The Zephyr mimx8mp_evk board configuration supports the following hardware
features:

+-----------+------------+-------------------------------------+
| Interface | Controller | Driver/Component                    |
+===========+============+=====================================+
| NVIC      | on-chip    | nested vector interrupt controller  |
+-----------+------------+-------------------------------------+
| SYSTICK   | on-chip    | systick                             |
+-----------+------------+-------------------------------------+
| CLOCK     | on-chip    | clock_control                       |
+-----------+------------+-------------------------------------+
| PINMUX    | on-chip    | pinmux                              |
+-----------+------------+-------------------------------------+
| UART      | on-chip    | serial port-polling;                |
|           |            | serial port-interrupt               |
+-----------+------------+-------------------------------------+

The default configuration can be found in the defconfig file:
:zephyr_file:`boards/arm/mimx8mp_evk/mimx8mp_evk_defconfig`.

Other hardware features are not currently supported by the port.

Connections and IOs
===================

MIMX8MP EVK board was tested with the following pinmux controller
configuration.

+---------------+-----------------+---------------------------+
| Board Name    | SoC Name        | Usage                     |
+===============+=================+===========================+
| UART4 RXD     | UART4_TXD       | UART Console              |
+---------------+-----------------+---------------------------+
| UART4 TXD     | UART4_RXD       | UART Console              |
+---------------+-----------------+---------------------------+

System Clock
============

The M7 Core is configured to run at a 800 MHz clock speed.

Serial Port
===========

The i.MX8M Plus SoC has four UARTs. UART_4 is configured for the console and
the remaining are not used/tested.

Programming and Debugging
*************************

The MIMX8MP EVK board doesn't have QSPI flash for the M7, and it needs
to be started by the A53 core. The A53 core is responsible to load the M7 binary
application into the RAM, put the M7 in reset, set the M7 Program Counter and
Stack Pointer, and get the M7 out of reset. The A53 can perform these steps at
bootloader level or after the Linux system has booted.

The M7 can use up to 3 different RAMs (currently, only two configurations are
supported: ITCM and DDR). These are the memory mapping for A53 and M7:

+------------+-------------------------+------------------------+-----------------------+----------------------+
| Region     | Cortex-A53              | Cortex-M7 (System Bus) | Cortex-M7 (Code Bus)  | Size                 |
+============+=========================+========================+=======================+======================+
| OCRAM      | 0x00900000-0x0098FFFF   | 0x20200000-0x2028FFFF  | 0x00900000-0x0098FFFF | 576KB                |
+------------+-------------------------+------------------------+-----------------------+----------------------+
| DTCM       | 0x00800000-0x0081FFFF   | 0x20000000-0x2001FFFF  |                       | 128KB                |
+------------+-------------------------+------------------------+-----------------------+----------------------+
| ITCM       | 0x007E0000-0x007FFFFF   |                        | 0x00000000-0x0001FFFF | 128KB                |
+------------+-------------------------+------------------------+-----------------------+----------------------+
| OCRAM_S    | 0x00180000-0x00188FFF   | 0x20180000-0x20188FFF  | 0x00180000-0x00188FFF | 36KB                 |
+------------+-------------------------+------------------------+-----------------------+----------------------+
| DDR        | 0x80000000-0x803FFFFF   | 0x80200000-0x803FFFFF  | 0x80000000-0x801FFFFF | 2MB                  |
+------------+-------------------------+------------------------+-----------------------+----------------------+

For more information about memory mapping see the
`i.MX 8M Plus Applications Processor Reference Manual`_  (section 2.1 to 2.3)

At compilation time you have to choose which RAM will be used. This
configuration is done based on board name (mimx8mp_evk_itcm for ITCM and
mimx8mp_evk_ddr for DDR).

Load and run Zephyr on M7 from A53 using u-boot by copying the compiled
``zephyr.bin`` to the first FAT partition of the SD card and plug the SD
card into the board. Power it up and stop the u-boot execution at prompt.

Load the M7 binary onto the desired memory and start its execution using:

ITCM
===

.. code-block:: console

   fatload mmc 0:1 0x48000000 zephyr.bin
   cp.b 0x48000000 0x7e0000 20000
   bootaux 0x7e0000

DDR
===

.. code-block:: console

   fatload mmc 0:1 0x80000000 zephyr.bin
   dcache flush
   bootaux 0x80000000

Debugging
=========

MIMX8MP EVK board can be debugged by connecting an external JLink
JTAG debugger to the J24 debug connector and to the PC. Then
the application can be debugged using the usual way.

Here is an example for the :ref:`hello_world` application.

.. zephyr-app-commands::
   :zephyr-app: samples/hello_world
   :board: mimx8mp_evk_itcm
   :goals: debug

Open a serial terminal, step through the application in your debugger, and you
should see the following message in the terminal:

.. code-block:: console

   *** Booting Zephyr OS build v2.7.99-1310-g2801bf644a91  ***
   Hello World! mimx8mp_evk

References
==========

.. _NXP website:
   https://www.nxp.com/design/development-boards/i-mx-evaluation-and-development-boards/evaluation-kit-for-the-i-mx-8m-plus-applications-processor:8MPLUSLPD4-EVK

.. _i.MX 8M Plus Applications Processor Reference Manual:
   https://www.nxp.com/webapp/Download?colCode=IMX8MPRM