https://os.mbed.com/linux-os/
Mbed Linux OS
A free Linux distribution re-imagined for IoT
Arm Mbed Linux OS is a new, open-source embedded operating system designed specifically to help you create extraordinary "things" based on Arm Cortex-A microprocessors. For Cortex-M-based development, Mbed OS is Arm’s operating system of choice and offers developers all the necessary tools to build their IoT products.
Designed to help you easily create devices by enabling you to focus on adding value rather than building infrastructure, the Mbed Linux OS will provide everything you need to build secure and manageable connected products. Just add your skill and imagination and you’ll quickly be developing some amazing applications.