doc: board: verdin-imx8mm: convert readme to reST

Convert README to reStructuredText format.

Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: spell out U-Boot correctly]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

2 files changed, 113 insertions, 0 deletions

diff --git a/doc/board/toradex/index.rst b/doc/board/toradex/index.rst
index aa418d6bad..6cd2ade9f4 100644
--- a/doc/board/toradex/index.rst
+++ b/doc/board/toradex/index.rst
@@ -7,3 +7,4 @@ Toradex
    :maxdepth: 2
 
    colibri_imx7
+   verdin-imx8mm
diff --git a/doc/board/toradex/verdin-imx8mm.rst b/doc/board/toradex/verdin-imx8mm.rst
new file mode 100644
index 0000000000..b2ae4fabea
--- /dev/null
+++ b/doc/board/toradex/verdin-imx8mm.rst
@@ -0,0 +1,112 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Verdin iMX8M Mini Module
+========================
+
+Quick Start
+-----------
+
+- Build the ARM trusted firmware binary
+- Get the DDR firmware
+- Build U-Boot
+- Flash to eMMC
+- Boot
+
+Get and Build the ARM Trusted Firmware (Trusted Firmware A)
+-----------------------------------------------------------
+
+.. code-block:: bash
+
+    $ echo "Downloading and building TF-A..."
+    $ git clone -b imx_4.14.98_2.3.0 \
+      https://source.codeaurora.org/external/imx/imx-atf
+    $ cd imx-atf
+
+Please edit ``plat/imx/imx8mm/include/platform_def.h`` so it contains proper
+values for UART configuration and BL31 base address (correct values listed
+below):
+
+.. code-block:: bash
+
+    #define BL31_BASE                   0x910000
+    #define IMX_BOOT_UART_BASE          0x30860000
+    #define DEBUG_CONSOLE               1
+
+Then build ATF (TF-A):
+
+.. code-block:: bash
+
+    $ make PLAT=imx8mm bl31
+
+Get the DDR Firmware
+--------------------
+
+.. code-block:: bash
+
+    $ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.4.1.bin
+    $ chmod +x firmware-imx-8.4.1.bin
+    $ ./firmware-imx-8.4.1.bin
+    $ cp firmware-imx-8.4.1/firmware/ddr/synopsys/lpddr4*.bin ./
+
+Build U-Boot
+------------
+.. code-block:: bash
+
+    $ export CROSS_COMPILE=aarch64-linux-gnu-
+    $ make verdin-imx8mm_defconfig
+    $ make flash.bin
+
+Flash to eMMC
+-------------
+
+.. code-block:: bash
+
+    > tftpboot ${loadaddr} flash.bin
+    > setexpr blkcnt ${filesize} + 0x1ff && setexpr blkcnt ${blkcnt} / 0x200
+    > mmc dev 0 1 && mmc write ${loadaddr} 0x2 ${blkcnt}
+
+As a convenience, instead of the last two commands one may also use the update
+U-Boot wrapper:
+
+.. code-block:: bash
+
+    > run update_uboot
+
+Boot
+----
+
+ATF, U-Boot proper and u-boot.dtb images are packed into FIT image,
+which is loaded and parsed by SPL.
+
+Boot sequence is:
+
+* SPL ---> ATF (TF-A) ---> U-Boot proper
+
+Output:
+
+.. code-block:: bash
+
+    U-Boot SPL 2020.01-00187-gd411d164e5 (Jan 26 2020 - 04:47:26 +0100)
+    Normal Boot
+    Trying to boot from MMC1
+    NOTICE:  Configuring TZASC380
+    NOTICE:  RDC off
+    NOTICE:  BL31: v2.0(release):rel_imx_4.14.98_2.3.0-0-g09c5cc994-dirty
+    NOTICE:  BL31: Built : 01:11:41, Jan 25 2020
+    NOTICE:  sip svc init
+
+
+    U-Boot 2020.01-00187-gd411d164e5 (Jan 26 2020 - 04:47:26 +0100)
+
+    CPU:   Freescale i.MX8MMQ rev1.0 at 0 MHz
+    Reset cause: POR
+    DRAM:  2 GiB
+    MMC:   FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
+    Loading Environment from MMC... OK
+    In:    serial
+    Out:   serial
+    Err:   serial
+    Model: Toradex Verdin iMX8M Mini Quad 2GB Wi-Fi / BT IT V1.0A, Serial:
+    Net:   eth0: ethernet@30be0000
+    Hit any key to stop autoboot:  0
+    Verdin iMX8MM #