This package is derived from the Arduino Zero (package: Arduino SAMD Boards (32-bit ARM Cortex-M0+), see my article here: https://www.avdweb.nl/arduino/samd21/samd21-variant
This package is derived from the Arduino Zero (package: Arduino SAMD Boards (32-bit ARM Cortex-M0+), see my article here: https://www.avdweb.nl/arduino/samd21/samd21-variant