Adding support to new MCU

Hi, I would like to build a custom board around unlisted MCU in klipper, My question is how to add support to a new MCU, what is the minimum code that should be written to do the job?
The MCU that I intend to use as a test will be ATSAM3S2C, may be I will change the MCU later but for now I will be using this one.

The place to start is the Klipper developer documentation: https://www.klipper3d.org/Overview.html#developer-documentation.

-Kevin

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