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# The minimal port
This port is intended to be a minimal MicroPython port that actually runs.
It can run under Linux (or similar) and on any STM32F4xx MCU (eg the pyboard).
## Building and running Linux version
By default the port will be built for the host machine:
$ make
To run a small test script do:
$ make run
## Building for an STM32 MCU
The Makefile has the ability to build for a Cortex-M CPU, and by default
includes some start-up code for an STM32F4xx MCU and also enables a UART
for communication. To build:
$ make CROSS=1
If you previously built the Linux version, you will need to first run
`make clean` to get rid of incompatible object files.
Building will produce the build/firmware.dfu file which can be programmed
to an MCU using:
$ make CROSS=1 deploy
This version of the build will work out-of-the-box on a pyboard (and
anything similar), and will give you a MicroPython REPL on UART1 at 9600
baud. Pin PA13 will also be driven high, and this turns on the red LED on
the pyboard.
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