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Building Micropython from source post

These are notes to myself mainly.

  1. Start by following the main guide.

  2. For Mac you can get the build chain through a [special brew tap](https://github.com/ARMmbed/homebrew-formulae:

brew tap ArmMbed/homebrew-formulae
brew install arm-none-eabi-gcc

You also need the brew equivalents of the dependencies listed: brew install gcc cmake libffi-dev git pkg-config

  1. Build mpy-cross as directed.

  2. Build the unix port just because it's useful

  3. Build the port for the board you want, RP2040 for me

cd ports/rp2 
make submodules
make -j 16
  1. Build the port with additional libraries. I wanted to try out this display driver so following the build instructions there, I ran:
make USER_C_MODULES=../../../gc9a01_mpy/src/micropython.cmake all

If you run into trouble, it helps to make clean in between trying things. I upgraded my cmake and it didn't seem to help until I ran make clean and tried again.