Step 5 : Flash to SD Card
=========================

.. tab-set::

   .. tab-item:: Flash to SD Card

        * In this program, you are going to learn


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                :column: col-lg-12 p-2
                :card: shadow

                * How to ?


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        Topics in this section,

                * :ref:`Flash the OS <yocto_rpi_3b_step5_0>`


.. _yocto_rpi_3b_step5_0:

.. tab-set::

   .. tab-item:: Flash the OS

        * Insert the SD card reader and run dmesg to find the device name.

        .. code-block:: c

                $ sudo dmesg | tail
                [sudo] password for wifi: 
                [13956.819387] sd 1:0:0:0: [sda] No Caching mode page found
                [13956.819394] sd 1:0:0:0: [sda] Assuming drive cache: write through
                [13956.819980] sd 1:0:0:1: [sdb] Media removed, stopped polling
                [13956.820433] sd 1:0:0:2: [sdc] Media removed, stopped polling
                [13956.820650] sd 1:0:0:1: [sdb] Attached SCSI removable disk
                [13956.820901] sd 1:0:0:3: [sdd] Media removed, stopped polling
                [13956.821201] sd 1:0:0:2: [sdc] Attached SCSI removable disk
                [13956.821604] sd 1:0:0:3: [sdd] Attached SCSI removable disk
                [13956.828315]  sda:
                [13956.828399] sd 1:0:0:0: [sda] Attached SCSI removable disk

        
        * Run fdisk to know the device name and its details.

        .. code-block:: c

                $ sudo fdisk -l
                Disk /dev/sda: 59.45 GiB, 63831015424 bytes, 124669952 sectors
                Disk model: USB SD Reader   
                Units: sectors of 1 * 512 = 512 bytes
                Sector size (logical/physical): 512 bytes / 512 bytes
                I/O size (minimum/optimal): 512 bytes / 512 bytes
                Disklabel type: dos
                Disk identifier: 0x5452574f
   

        * Extract the image using the bzip2 command.

        .. code-block:: c

                $ cd $HOME/build/tmp/deploy/images/raspberrypi4-64
                $ bzip2 -d -f core-image-base-raspberrypi3-64.wic.bz2

        * Flash the image to SD card.

        .. code-block:: c

                $ sudo dd bs=4M if=core-image-base-raspberrypi3-64.wic of=/dev/sda status=progress conv=fsync