Added new seco-imx8mm-c61 in Supported boards

documentation/source/supported-boards/seco-imx8mm-c61.rst

+.. include:: ../definitions.rst
+
+SBC-C61 SECO
+############
+
+
+.. contents:: 
+   :depth: 3
+   
+
+Overview
+********
+SBC-C61 is an SBC built upon the NXP i.MX 8M mini Application Processors characterised by HEVC/VP9 decoding in 1080p60. As for the memory, it features a LPDDR4 RAM. The range of connectivity options is particularly
+broad, with optional Wi-Fi and BT LE 4.2 and optionally soldered on-board LTE Cat 4 Modem with microSIM slot or eSIM. Interestingly, it also features a Cortex-M4, that is real-time operating system capable
+for serving real-time applications that process data as it comes in without buffer delays.
+
+Hardware
+********
+
+For more detailed specifications of SBC-C61 SECO board, see `SBC-C61 Specification <https://www.seco.com/en/products/sbc-c61>`__.
+
+Working with the board
+**********************
+
+Supported image
+===============
+
+core-image-base
+
+Building OHOS image
+===================
+
+To clone the source code, perform the procedure in `Getting started <https://git.ostc-eu.org/OSTC/OHOS/docs/developer-guide/-/blob/master/documentation/source/quick-start/build-open-harmony.rst>`__.
+
+Linux image
+-----------
+
+1. Source the environment with proper template settings, flavour being ``linux`` and target machine being ``seco-imx8mm-c61``.
+
+.. code-block:: console
+
+   $ TEMPLATECONF=../sources/meta-ohos/flavours/linux . ./sources/poky/oe-init-build-env build-ohos-linux-seco-imx8mm-c61
+
+2. You will find yourself in the newly created build directory. Call ``bitbake`` to build the image. The supported image is ``core-image-base``.
+
+.. code-block:: console
+
+   $ MACHINE=seco-imx8mm-c61 bitbake core-image-base
+
+To generate images for eMMC, refer to the following flashing procedure.
+
+Flashing OHOS image
+*******************
+.. _linux-image-1:
+
+Linux image
+===========
+
+MMC Storage
+-----------
+
+**Prerequisites**
+
+* USB To UART adapter
+* USB to OTG adapter
+* Download and install `mfgtools <https://github.com/NXPmicro/mfgtools>`__
+* Linux Host
+
+To flash OHOS using USB to OTG adapter, perform the following steps:
+
+#. Short circuit pin 1 and 2 of CN52 pin header to enter the Serial Download mode.
+#. Connect USB to OTG adapter to your host PC
+#. Navigate to the inside build output directory:
+
+   .. code-block:: console
+
+      $ cd tmp/deploy/images/seco-imx8mm-c61/
+
+#. Unzip build output using Gzip software:
+
+   .. code-block:: console
+
+      $ gzip -d core-image-base-seco-imx8mm-c61.wic.gz
+
+#. To write uboot and image(p1:kernel, p2:dtb, rootfs) into c61 mmc via mfgtools:
+
+   .. code-block:: console
+
+      $ sudo uuu -b emmc_all imx-boot-seco-imx8mm-c61-emmc.bin-flash_evk core-image-base-seco-imx8mm-c61.wic
+   
+#. Power ON SBC-C61
+#. Remove **CN52 short circuit**
+#. Press the reset button
+
+Testing the board
+*****************
+
+Ethernet
+========
+
+You can use standard tools like ``ip``, ``ifconfig`` to configure the connection.
+
+::
+
+   root@seco-imx8mm-c61:~# ifconfig
+   eth0      Link encap:Ethernet  HWaddr 1A:20:58:83:70:F0  
+             UP BROADCAST MULTICAST  MTU:1500  Metric:1
+             RX packets:0 errors:0 dropped:0 overruns:0 frame:0
+             TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
+             collisions:0 txqueuelen:1000 
+             RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
+
+USB Host
+========
+
+::
+
+   root@seco-imx8mm-c61:~# lsusb
+   Bus 001 Device 003: ID 058f:6387 Alcor Micro Corp. Flash Drive
+   Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
+   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+
+eMMC
+====
+
+::
+
+   root@seco-imx8mm-c61:~# fdisk -l /dev/mmcblk0
+   Disk /dev/mmcblk0: 59 GB, 63585648640 bytes, 124190720 sectors
+   1940480 cylinders, 4 heads, 16 sectors/track
+   Units: sectors of 1 * 512 = 512 bytes
+
+   Device       Boot StartCHS    EndCHS        StartLBA     EndLBA    Sectors  Size Id Type
+   /dev/mmcblk0p1 *  64,0,1      893,3,4           8192     114403     106212 51.8M  c Win95 FAT32 (LBA)
+   /dev/mmcblk0p2    896,0,1     1023,3,32       114688     558903     444216  216M 83 Linux
+
+Loaded Modules
+==============
+
+::
+
+   root@seco-imx8mm-c61:~# lsmod
+   Module                  Size  Used by
+   nfc                    90112  0
+   bluetooth             409600  8
+   ecdh_generic           16384  1 bluetooth
+   ecc                    32768  1 ecdh_generic
+   rfkill                 36864  3 nfc,bluetooth
+   ipv6                  442368  26
+   caam_jr               196608  0
+   caamhash_desc          16384  1 caam_jr
+   caamalg_desc           36864  1 caam_jr
+   crypto_engine          16384  1 caam_jr
+   rng_core               24576  1 caam_jr
+   authenc                16384  1 caam_jr
+   libdes                 24576  1 caam_jr
+   snd_soc_simple_card    20480  0
+   fsl_imx8_ddr_perf      20480  0
+   crct10dif_ce           20480  1
+   snd_soc_simple_card_utils    24576  1 snd_soc_simple_card
+   rtc_snvs               16384  1
+   snvs_pwrkey            16384  0
+   caam                   40960  1 caam_jr
+   clk_bd718x7            16384  0
+   error                  24576  4 caamalg_desc,caamhash_desc,caam,caam_jr
+   imx8mm_thermal         16384  0
+   snd_soc_fsl_sai        20480  0
+   imx_cpufreq_dt         16384  0
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