This repository isn't downstream ARC Zephyr fork, all improvements and fixes for ARC cores are submitted to upstream project.
Please visit https://github.com/zephyrproject-rtos/zephyr/releases if you're looking for Zephyr releases or https://github.com/zephyrproject-rtos/zephyr if you're interested in a bleeding edge sources.
This repository isn't the place to submit issues or pull-requests (even ARC-related ones). If you want to submit issue or pull-request please visit https://github.com/zephyrproject-rtos/zephyr
You can find here some work-in-progress development branches which haven't reach the upstream yet.