Jantje:
My 2 cents
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My bet would be there will be an UNO install and a DUE upgrade. The due upgrade will then create a new folder in arduino/cores and maybe add folders into arduino/variants.
This is all governed by the boards.txt file. So it would be really nice if it worked as follows: Install empty Arduino IDE; select your board in the IDE ; IDE sees the core and variant info is not existing and asks to download.
I expect version "1.0" will not have this feature.
Again only my 2 cents
Great 2 ยข!
That's the way chipKIT MPIDE handles both PIC32 and Arduino platforms, Energia handles LaunchPad MSP430 and Arduino platforms, ... And so does my embedXcode template.
The relevant framework is identified by parsing the different boards.txt. Key information is the board tag.