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the j-core processor, a clean-room open source processor and SOC design using the SuperH instruction set, implemented in VHDL and available royalty and patent free under a BSD license
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The j2 is a nommu processor because sh2 (the processor in the Sega Saturn game console) was, and the last sh2 patent expired in October 2014
There's a video: Building a CPU from Scratch: jcore Design Walkthrough by Rob Landley & Jeff Dionne
For more on j-core CPUs, see http://j-core.org/ and, for Linux without an MMU, http://nommu.org/
