So you want to build an embedded Linux system?

Embedded Linux systems are increasingly popular for engineers looking to develop more complex, internet-connected devices. This article serves as a primer for embedded engineers familiar with microcontrollers but new to microprocessors and Linux. It discusses the advantages of using application processors, which are essential for running Linux due to their memory management units (MMUs). The author emphasizes that once a system is booted into Linux, the development environment becomes uniform across different processors, making them nearly interchangeable. The article also highlights the importance of hardware design, noting that the complexity of PCB design varies significantly among application processors. The author shares insights from designing multiple development boards, focusing on cost optimization and troubleshooting. Key differences between microcontrollers and application processors are outlined, particularly the significance of MMUs for memory management and dynamic allocation. The article further explores the benefits of Linux in networking, security, and data management, contrasting it with bare-metal real-time operating systems (RTOS). Linux provides robust networking capabilities, easier debugging, and better security features, making it a compelling choice for embedded systems. The author encourages engineers to explore designing their own Linux boards, emphasizing the learning experience involved.

- Embedded Linux systems are suitable for complex, internet-connected devices.

- Application processors with MMUs are necessary for running Linux.

- Hardware design complexity varies significantly among application processors.

- Linux offers superior networking, security, and data management compared to bare-metal RTOS.

- Engineers are encouraged to design their own Linux boards for better learning and experience.