Note that bootloaders for STM32H7 are in PX4 tree.

This repository is just for legacy bootloaders on STM32F1/F3/F4/F7.

This repository also serves to keep track of board IDs for PX4 in board_types.txt.

It should be kept in sync with ArduPilot's board_types.txt as much as possible.

Build all targets:

git submodule sync --recursive
git submodule update --init --recursive
make

The binaries will be in build/BOARDNAME/BOARDNAME.elf. Two files are built: ELF files for use with JTAG adapters and BIN files for direct onboard upgrading.

Build a specific board: Please check the Makefile for specific build targets.

License: LGPL3 for libopencm3, BSD-3-clause for core bootloader (see LICENSE.md)

• Chat: Dronecode Discord
• Forum: Dronecode Discuss

The typical use case as used for the the PX4IO is described in px4pipbl.pdf.

To avoid accidental erasure or bad image loading:

• The bootloader needs to receive PROTO_GET_SYNC and PROTO_GET_DEVICE prior to receiving PROTO_CHIP_ERASE.
• The bootloader needs to receive PROTO_GET_SYNC and PROTO_GET_DEVICE and PROTO_PROG_MULTI and PROTO_GET_CRC prior to receiving PROTO_BOOT.