Technical requirements
To follow along with the examples, make sure you have the following:
- An Ubuntu 24.04 or later LTS-based host system
 - A Bootlin 
aarch64toolchain from Chapter 2 - A microSD card reader and card
 - A microSD card with U-Boot installed from Chapter 3
 - A USB to TTL serial cable with 3.3V logic level
 - The Raspberry Pi 4
 - The BeaglePlay
 - A 5V USB-C power supply capable of delivering 3A
 
The code used in this chapter can be found in the chapter folder in this book’s GitHub repository: https://github.com/PacktPublishing/Mastering-Embedded-Linux-Development/tree/main/Chapter04.