SAMD21 Bootloader

One has to install OpenOCD on a Raspberry Pi:
Update and install some tools:

sudo apt-get update
sudo apt-get install git autoconf libtool make pkg-config libusb-1.0-0 libusb-1.0-0-dev htop

git clone http://openocd.zylin.com/openocd

Compile:

cd openocd-code
./bootstrap
./configure --enable-sysfsgpio --enable-bcm2835gpio
make
sudo make install

List of Interfaces:

cd /usr/local/share/openocd/scripts/interface
ls

Wiring the SAMD21 Board:

 RasPi-GPIO  SAMD21
    18        Reset
    24        SWD IO
    25        SWD CLK
    GND       GND
    3V§       3V3

Install OpenOCP

Here one finds some SAMD21 bootloader:

dernulleffekt