adapted from https://book.drone-os.com/bmp-from-bluepill.html

bmp-from-bluepill-mac

brew install gcc curl dfu-util gdb-multiarch git python python-pip

# install gcc-arm-none-eabi from
https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads

mkdir -p /usr/local && cd /usr/local
tar xjf gcc-arm-none-eabi-8-2019-q3-update-mac.tar.bz2 
PATH=$PATH:/usr/local/gcc-arm-none-eabi-8-2019-q3-update/bin

git clone https://github.com/jsnyder/stm32loader
pip install pyserial

git clone https://github.com/blacksphere/blackmagic
cd blackmagic
git submodule update --init --recursive

# make blackmagic binaries
make PROBE_HOST=swlink

# find USB UART device TTY
# looks like /dev/tty.usbserial-A50285BI

# flash firmware over DFU
sudo ../stm32loader/stm32loader.py -p /dev/tty.usbserial-A50285BI -e -w -v src/blackmagic_dfu.bin