Step 6 : Flash SD Card
======================

.. tab-set::

   .. tab-item:: Flash SD Card

        * In this program, you are going to learn


        .. panels::
                :container: container pb-4
                :column: col-lg-12 p-2
                :card: shadow

                * How to ?


.. panels::
        :container: container pb-4
        :column: col-lg-12 p-2
        :card: shadow

        Topics in this section,

                * :ref:`Create a directory inside Main directory <zephyr_rpi_step6_0>`


.. _zephyr_rpi_step6_0:

.. tab-set::

   .. tab-item:: Create a directory inside Main directory

        * Go to main directory 

        .. code-block:: c

                $ cd $HOME
                $ mkdir Zephyr_flash
                $ cd Zephyr_flash
        
        * Download and place these files using web link:

                * `bcm2711-rpi-4-b.dtb <https://raw.githubusercontent.com/raspberrypi/firmware/master/boot/bcm2711-rpi-4-b.dtb>`_

                * `bootcode.bin <https://raw.githubusercontent.com/raspberrypi/firmware/master/boot/bootcode.bin>`_

                * `start4.elf <https://raw.githubusercontent.com/raspberrypi/firmware/master/boot/start4.elf>`_


        * Alternatively download using wget command,

        .. code-block:: c

                $ wget https://raw.githubusercontent.com/raspberrypi/firmware/master/boot/bcm2711-rpi-4-b.dtb 
                $ wget https://raw.githubusercontent.com/raspberrypi/firmware/master/boot/bootcode.bin
                $ wget https://raw.githubusercontent.com/raspberrypi/firmware/master/boot/start4.elf

        * Create the config.txt file and copy the below lines and save the file

        .. code-block:: c

                $ vi config.txt

        * Place the following contents in ``config.txt`` file.

        .. code-block:: c

                kernel=zephyr.bin
                arm_64bit=1
                enable_uart=1
                uart_2ndstage=1

        * Copy the zephyr.bin file to Zephyr_flash directory

        .. code-block:: c

                $ cp /home/test/zephyrproject/zephyr/build/zephyr/zephyr.bin /home/Zephyr_flash

        * Copy all the below files to TF card(SD card)

        .. code-block:: c

                bcm2711-rpi-4-b.dtb
                bootcode.bin
                start4.elf
                config.txt
                zephyr.bin

        * Copy using ``cp`` command,

        .. code-block:: c

                $ cp Zephyr_flash/bcm2711-rpi-4-b.dtb /mnt/boot/
                $ cp Zephyr_flash/bootcode.bin /mnt/boot/
                $ cp Zephyr_flash/start4.elf /mnt/boot/
                $ cp Zephyr_flash/config.txt /mnt/boot/
                $ cp Zephyr_flash/zephyr.bin /mnt/boot/