Step 6 : Flash SD Card

Flash SD Card

• In this program, you are going to learn

• How to ?

Topics in this section,

• Create a directory inside Main directory

Create a directory inside Main directory

• Go to main directory

$ cd $HOME
$ mkdir Zephyr_flash
$ cd Zephyr_flash

• Download and place these files using web link:

  • bcm2711-rpi-4-b.dtb

  • bootcode.bin

  • start4.elf

• Alternatively download using wget command,

$ 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

$ vi config.txt

• Place the following contents in config.txt file.

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

• Copy the zephyr.bin file to Zephyr_flash directory

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

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

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

• Copy using cp command,

$ 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/