How to Cross Compile Zephyr OS
For example, in this blog (originally posted here) Turhan details how to cross compile, from a Mac environment, Zephyr™ OS for an ARM target architecture using GNU Arm Embedded Toolchain.
GNU Arm Embedded Toolchain
First of all, download the GNU Arm Embedded Toolchain for Mac OS which is currently the 2017-q4-major release.
Then, install the toolchain in your home /opt directory, as follow:
To check if the toolchain is properly install, simply run gcc with the — version option:
Getting and compiling Zephyr OS
As explained in the documentation, you will need some dependencies utilities and applications that you need to get:
Now, you need to clone Zephyr and install all the requirements requested by Zephyr itself (thanks to pip):
Now gets the interesting part. We will compile an image of Zephyr™, from our Mac, targeting the Arduino DUE, which is an ARM based board.
The first thing is to set some environment variables that will be used by Ninja and cmake. It is mainly the ARM toolchain path and letting Zephyr know about it:
Building the hello world sample
Finally, we can build the hello_world sample provided in the repository, targeting our ARM board:
Bonus: run your application in qemu
Arduino DUE is based on a cortex M3 CP UTo run your application in qemu, you need to compile it against qemu. To do so, proceed as follows:
What motivates me to share this tutorial is that I couldn’t find easily how to install the third part toolchain and how to configure the environment for cross-compiling.
To learn more about Zephyr:
For more from Turhan OZ:
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