[riot-notifications] [RIOT-OS/RIOT] boards: add support for nrf52840-dongle (#13146)

benpicco notifications at github.com
Fri May 8 11:30:19 CEST 2020

> what does providing (or using) bootloader_nrfutil mean?

It will do two things:
 - if you open the `ttyACM` device with a special baudrate, RIOT will reset the board, but before it does that it writes a magic value to a certain location in memory, specific to the bootloader
 - the bootloader checks that memory for the magic value and if it matches, it will not start the payload but instead enter DFU mode (or whatever the bootloader uses for flashing).

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