bsh: imx8mn-smm-s2/pro: Add iMX8MN BSH SMM S2 boards

Introduce BSH SystemMaster (SMM) S2 board family, which consists of:
iMX8MN SMM S2 and iMX8MN SMM S2 PRO boards.

Add support for iMX8MN BSH SMM S2 board:

- 256 MiB DDR3 RAM
- 512MiB Nand
- USBOTG1 peripheral - fastboot.
- 100Mbit Ethernet

Add support for iMX8MN BSH SMM S2 PRO board:

- 512 MiB DDR3 RAM
- 8 GiB eMMC
- USBOTG1 peripheral - fastboot.
- 100Mbit Ethernet

Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>

doc/board/bsh/imx8mn_bsh_smm_s2.rst

@@ -0,0 +1,61 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+imx8mn_bsh_smm_s2
+=================
+
+U-Boot for the BSH SystemMaster (SMM) S2 board family.
+
+Quick Start
+-----------
+
+- Build the ARM Trusted firmware binary
+- Get firmware-imx package
+- Build U-Boot
+- Boot
+
+Get and Build the ARM Trusted firmware
+--------------------------------------
+
+Note: srctree is U-Boot source directory
+Get ATF from: https://github.com/ARM-software/arm-trusted-firmware
+tag: v2.5
+
+.. code-block:: bash
+
+   $ make PLAT=imx8mn IMX_BOOT_UART_BASE=0x30a60000 bl31
+   $ cp build/imx8mn/release/bl31.bin $(srctree)
+
+Get the ddr firmware
+--------------------
+
+.. code-block:: bash
+
+   $ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.9.bin
+   $ chmod +x firmware-imx-8.9.bin
+   $ ./firmware-imx-8.9
+   $ cp firmware-imx-8.9/firmware/ddr/synopsys/ddr3*.bin $(srctree)
+
+Build U-Boot
+------------
+
+.. code-block:: bash
+
+   $ export CROSS_COMPILE=aarch64-linux-gnu-
+   $ make imx8mn_bsh_smm_s2_defconfig
+   $ make
+
+Burn the flash.bin to MicroSD card offset 32KB:
+
+.. code-block:: bash
+
+   $ dd if=flash.bin of=/dev/sd[x] bs=1024 seek=32 conv=notrunc
+
+Boot
+----
+
+Start the board in USB serial downloader mode, plug-in the USB-OTG port and
+load flash.bin using Freescale/NXP UUU tool:
+
+.. code-block:: bash
+
+   $ uuu -v flash.bin

doc/board/bsh/index.rst

@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+BSH Hausgeraete GmbH
+====================
+
+.. toctree::
+   :maxdepth: 2
+
+   imx8mn_bsh_smm_s2

doc/board/index.rst

@@ -15,6 +15,7 @@ Board-specific doc
    armltd/index
    atmel/index
    broadcom/index
+   bsh/index
    congatec/index
    coreboot/index
    emulation/index