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MCUboot is a secure bootloader for 32-bits microcontrollers.


MCUboot defines a common infrastructure for the bootloader and the system flash layout on microcontroller systems, and provides a secure bootloader that enables easy software upgrade.

MCUboot is not dependent on any specific operating system and hardware and relies on hardware porting layers from the operating system it works with. Currently MCUboot works with the following operating systems and SoCs:

RIOT is supported only as a boot target. We will accept any new port contributed by the community once it is good enough.

MCUboot is an open governance project. See the membership list for current members, and the project charter for more details.


The MCUboot documentation is composed of the following pages:

The documentation page about signed images is currently outdated. Follow the instructions in imgtool instead.


The issues being planned and worked on are tracked using GitHub issues. To give your input, visit MCUboot GitHub Issues.

Source files

You can find additional documentation on the bootloader in the source files. For more information, use the following links:

Joining the project

Developers are welcome!

Use the following links to join or see more about the project: