There was a request to add support for Flutter, but following the link to the atmelsam project doesn’t show any relevant issues.
Support for Flutter Boards · Issue #871 · platformio/platformio-core · GitHub (closes with link to)
Should I add another issue for support? I have the hardware now, so I’m keen to try it out with platformio.
I’ve just moved it to
Do you need it ASAP?
No, not urgent. 
Hi all,
Has there been any movement on this issue?
Has anyone gotten this board to work?
We have worked up a flutter.json file that seems to have the correct values in it that represent the board.
Additionally we copied over the flutter variant directory from the Arduino-IDE. We are still having issue with the compile. If anyone can shed some light here on what our next steps would be that would be great.
Also looking for guidance on a dir structure that we can wrap this stuff up in to post more widely.