[jack12]

> POWER-powered low cost SOCs akin to Arduino

More in the range of the arduino than the pi, you could get a Colorlight 5A-75b for ~$15 on AliExpress and reprogram its FPGA to run an OpenPOWER core. It's a board meant for driving LED panels, but it has a Lattice ECP5-25F FPGA with a JTAG header easily accessible plus dual gigabit ethernet MACs and 4MB of SDRAM. The downside is all the rest of the IO is stuck behind one-way buffers since it's only designed to push data out to 5V LED panels. But it's been well reverse-engineered by the chubby75 project, the FPGA is well-supported by the open-source yosys+nextpnr FPGA toolchain, it's supported by the litex SoC builder (which also includes microwatt core support, though maybe not colorlight+microwatt?), and it looks like some have had success getting OpenPOWER cores to boot on it: https://twitter.com/antonblanchard/status/123177893988802969...