MIPS is a CPU architecture, and it's certainly not free and even has patents. The only architecture that I know of that is actually free is OpenCores. But that's just the hardware, and open hardware and free software are 2 different things.

The issue with this one is that it uses a GPU which requires a nonfree driver, and most likely has WiFi requiring nonfree firmware. So it has nothing to do with the architecture.

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