An in-depth tutorial on how to write a bootloader from scratch for ARM cortex-m series microcontrollers.

Paweł Kraszewski

Security

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Learn how to write a bootloader from scratch for a Cortex-M microcontroller. Topics include why bootloaders are needed, setting up memory maps, implementing the bootloader code, and making an application bootloadable. Advanced techniques like message passing to catch reboot loops, relocating the application from flash to RAM, and using the MPU to lock the bootloader are also discussed.

From Zero to main(): How to Write a Bootloader from Scratch

<p>I found that adding a simple checksum validation in the bootloader to ensure the integrity of the application code can save you from a lot of headaches down the line - it’s a small step that can prevent bricking your device if something goes wrong during the update process 🤦‍♂️.</p>
