Overview

riotboot_serial is a variation on riotboot that adds the capability to flash a new firmware using a serial (UART) connection.

After reset, riotboot will wait for RIOTBOOT_DELAY_MS ms, if within that time no command is received it will automatically start the application.

If it reads the B character, it will enter bootloader mode where flash sectors can be erased and written.

The application in dist/tools/riotboot_serial is used to talk to the bootloader and to flash .hex files using the bootloader's serial protocol.

Flashing a device

To flash a device that is equipped with the riotboot serial bootloader, set the PROGRAMMER variable to riotboot_serial and chose the PORT accordingly.

e.g.

make BOARD=same54-xpro PORT=/dev/ttyACM0 PROGRAMMER=riotboot_serial flash