please tell me how to install MegaCore
MegaCore support is coming, but there hasn’t been a release of platform-atmelavr since that support was added to the development branch. You can see if the following in your platformio.ini works to install the current develop branch platform-atmelavr. It compiles for me, but I don’t have a ATmega64 handy to check it…
I suspect it won’t be too long now until a new version of platform-atmelavr will be release so that it works straight out of the box.
[env:ATmega64] platform = https://github.com/platformio/platform-atmelavr.git#develop board = ATmega64 framework = arduino
Well, I didn’t expect it to be that soon!