Explore the process of building an open hardware CPU in this 16-minute conference talk from linux.conf.au 2020. Learn how to download, simulate, and synthesize Microwatt, an OpenPOWER core, onto an FPGA. Discover the ease of running Micropython and Zephyr on the core, and gain insights into modifying it by adding new instructions. Perfect for software enthusiasts interested in CPU hacking, this talk demonstrates the accessibility of open hardware architectures and affordable FPGAs for CPU development.