Particle STM32 Bootloader

Photon/Electron

After building the bootloader, it can be flashed to the device Over-the-Air using Particle CLI.

particle flash <devicename> bootloader.bin

This takes care of unlocking the protected memory regions, flashing the bootloader, and reprotecting the memory regions.

ensure that the environment variable OPENOCD_HOME points to the directory containing OpenOCD on your computer.
connect the programmer shield and start a telnet session on port 3333 as described here
send the openOCD commands via telnet
```
reset halt
flash protect 0 0 off
```

in the bootloader directory run

make PLATFORM=photon all program-openocd