Crate embassy_boot

source ·
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-rp - for the RP2040 microcontrollers.
  • embassy-boot-stm32 - for the STM32 microcontrollers.

Minimum supported Rust version (MSRV)

embassy-boot is guaranteed to compile on the latest stable Rust version at the time of release. It might compile with older versions but that may change in any new patch release.


This work is licensed under either of

at your option.


  • Buffer aligned to 32 byte boundary, largest known alignment requirement for embassy-boot.
  • Blocking FirmwareUpdater is an application API for interacting with the BootLoader without the ability to ‘mess up’ the internal bootloader state
  • BootLoader works with any flash implementing embedded_storage.
  • Bootloader flash configuration holding the three flashes used by the bootloader
  • Firmware updater flash configuration holding the two flashes used by the updater