This repository is intended as an educational reference design. It demonstrates one possible approach to designing and implementing a reliable OTA update system for embedded Linux.

The project focuses on the engineering decisions behind OTA systems, including:

update strategies;
system and storage architecture;
bootloader interaction;
atomic updates;
rollback and recovery;
integrity verification and signing;
testing and failure handling.

It is not tied to a specific OTA framework, hardware platform, or cloud provider.

Raspberry Pi may be used for practical demonstrations, but the underlying concepts are applicable to a broader range of embedded Linux devices.

This repository is not intended to be a production-ready framework. Instead, it is designed to explain the architectural principles, trade-offs, and failure scenarios that should be considered when building a real OTA system.

The repository is being developed incrementally as a structured series of articles, diagrams, architecture decisions, and practical examples.

Start with the series overview. The current practical material includes PlantUML diagrams and an A/B trial boot simulation with startup and recovery failure scenarios.

See the changelog for dated updates to the chapters, architecture decisions, diagrams, and simulations, with links to the material and related history.

License

This project is licensed under the MIT License. See LICENSE for details.