Programming ATSAMD51J18 with OpenOCD
To get an idea, see this tutorial.
Unfortunately, the current version of OpenOCD (0.10.0) does not ship a patch that is needed to work properly with the ATSAMD51J18.
This means, you may have to compile your own patched version of openocd.
Get openocd and patch it
We need this patch. The code below takes care of downloading and applying it.
git clone http://git.code.sf.net/p/openocd/code openocd
cd openocd
git fetch http://openocd.zylin.com/openocd refs/changes/72/4272/5 && git checkout FETCH_HEADCompile and install it
You will need a few dependencies / tools. Under Ubuntu 16, you can install most of them with:
sudo apt install autoconf build-essential cmake gdb-arm-none-eabi libtool libtool-bin libhidapi-dev libusb-dev libusb-1.0-0-dev pkg-configIf you don't want it under /usr/local, change the prefix in the configure command below.
./bootstrap
./configure --prefix=/usr/local --enable-aice --enable-amtjtagaccel --enable-armjtagew --enable-cmsis-dap --enable-dummy --enable-ftdi --enable-gw16012 --enable-jlink --enable-jtag_vpi --enable-opendous --enable-openjtag_ftdi --enable-osbdm --enable-legacy-ft2232_libftdi --enable-parport --disable-parport-ppdev --enable-parport-giveio --enable-presto_libftdi --enable-remote-bitbang --enable-rlink --enable-stlink --enable-ti-icdi --enable-ulink --enable-usb-blaster-2 --enable-usb_blaster_libftdi --enable-usbprog --enable-vsllink
make -j8
make install