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README.rst: document mpy-cross gotcha

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This was biting me, leading to an odd error later on.
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Jeff Epler 2018-03-19 21:56:32 -05:00
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ports/atmel-samd/README.rst
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@ -141,6 +141,17 @@ The compiler can be changed using the ``CROSS_COMPILE`` variable when invoking
Building
--------
Before building the firmware for a given board the MicroPython cross-compiler
must be built; it will be used to pre-compile some of the built-in scripts to
bytecode. The cross-compiler is built and run on the host machine, using:
.. code-block:: shell
make -C mpy-cross
This command should be executed from the root directory of this repository.
All other commands below should be executed from the ports/atmel-samd/ directory.
To build for the Arduino Zero:
.. code-block:: shell