Expand description


An Embassy project.

A lightweight bootloader supporting firmware updates in a power-fail-safe way, with trial boots and rollbacks.

The bootloader can be used either as a library or be flashed directly with the default configuration derived from linker scripts.

By design, the bootloader does not provide any network capabilities. Networking capabilities for fetching new firmware can be provided by the user application, using the bootloader as a library for updating the firmware, or by using the bootloader as a library and adding this capability yourself.

Hardware support

The bootloader supports different hardware in separate crates:

  • embassy-boot-nrf - for the nRF microcontrollers.
  • embassy-boot-stm32 - for the STM32 microcontrollers.

Minimum supported Rust version (MSRV)

embassy-boot requires Rust nightly to compile as it relies on async traits for interacting with the flash peripherals.


This work is licensed under either of

at your option.


Buffer aligned to 32 byte boundary, largest known alignment requirement for embassy-boot.
A flash wrapper implementing the Flash and embedded_storage traits.
A bootloader for nRF devices.
FirmwareUpdater is an application API for interacting with the BootLoader without the ability to ‘mess up’ the internal bootloader state
A region in flash used by the bootloader.
Convenience provider that uses a single flash for all partitions.
A flash implementation that wraps NVMC and will pet a watchdog when touching flash.


Trait defining the flash handles used for active and DFU partition