Secure boot for 32-bit Microcontrollers!

Clone this repo:
  1. 218aee7 workflow: Test the Mbed TLS ECDSA configuration by David Brown · 1 year, 10 months ago master
  2. 641af45 boot: Support Mbed TLS ECDSA for signatures by David Brown · 1 year, 10 months ago
  3. 0c8c8d5 boot: Direct-XIP: Add check for IMAGE_F_ROM_FIXED flag by Dominik Ermel · 1 year, 10 months ago
  4. 9590b42 boot: Add IMAGE_F_ROM_FIXED flag support to mcuboot by Dominik Ermel · 1 year, 10 months ago
  5. aee3be9 boot: Order IMAGE_F_* flags defintions by Dominik Ermel · 1 year, 10 months ago


Package on PyPI Coverity Scan Build Status Build Status (Sim) Build Status (Mynewt) Publishing Status (imgtool) Build Status (Travis CI) Apache 2.0

This is mcuboot version 1.8.0-dev

MCUboot is a secure bootloader for 32-bit MCUs. The goal of MCUboot is to define a common infrastructure for the bootloader, system flash layout on microcontroller systems, and to provide a secure bootloader that enables simple software upgrades.

MCUboot is operating system and hardware independent and relies on hardware porting layers from the operating. Currently, mcuboot works with both the Apache Mynewt and Zephyr operating systems, but more ports are planned in the future. RIOT is currently supported as a boot target with a complete port planned.

Using MCUboot

Instructions for different operating systems can be found here:


The issues being planned and worked on are tracked using GitHub issues. To participate please visit:

MCUBoot GitHub Issues

Issues were previously tracked on MCUboot JIRA , but it is now deprecated.


Information and documentation on the bootloader are stored within the source.

It was previously also documented on confluence: MCUBoot Confluence however, it is now deprecated and not currently maintained

For more information in the source, here are some pointers:

  • boot/bootutil: The core of the bootloader itself.
  • boot/boot_serial: Support for serial upgrade within the bootloader itself.
  • boot/zephyr: Port of the bootloader to Zephyr
  • boot/mynewt: Mynewt bootloader app
  • imgtool: A tool to securely sign firmware images for booting by mcuboot.
  • sim: A bootloader simulator for testing and regression


Developers welcome!