PlatformIO operates fundamentally differently, you can’t just give it a board manager URL and have PlatformIO recognize everything. It needs explicit coding in Python (+JSON descriptions) for each supported framework / board.
Support for that core with SAMD11 and SAML21 boards is still an open issue per
and
adn I don’t see an open PR that implements support yet, so no PlatformIO support yet.
Thanks for the reply.
For example, I need to be able to use platformio, for the ATSAMD51J19A, and ATSAME53J19A microcontroller, and generate their bootloaders.
There is a more detailed guide on how to generate platform.json and main.py, in order to add this two microcontrollers?