Building a CPU from Scratch: jcore Design Walkthrough by Rob Landley & Jeff Dionne





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Published on Jun 3, 2016

Building a CPU from Scratch: jcore Design Walkthrough - Rob Landley & Jeff Dionne, se-instruments When the SuperH patents expired in 2014, the j-core.org open hardware project created a new instruction-set compatible implementation and released the VHDL source under a BSD license, documenting the hardware and software build processes to boot Linux on a $50 FPGA board. Now we're inviting software developers who've never done hardware development before to come give it a try.

Even though j-core uses an existing instruction set, the implementation is all new. This is a walkthrough of the j-core processor and SOC designs, aimed at software developers who would like to learn hardware development. It provides a basic introduction to VHDL, the GHDL simulator, and answers the question "how do I stick a 'printf' into my FPGA bitstream?"

About Jeff Dionne
CEO, se-instruments.com
Jeff Dionne surfaced from the hardware world in the late 90's to create the uClinux project which ported linux to nommu embedded hardware. Then in 2003 he handed it off, moved to Japan, and went back to hardware development. These days he's CEO of se-instruments.com, where he started and maintains the j-core open processor project, which is compatible with the superh instruction set.

About Rob Landley

I used to maintain busybox and a tinycc fork, currently maintain toybox and aboriginal linux, and do nommu.org and j-core.org in my day job at se-instruments.com, which is adding sensors to the world's electrical distribution grid so we can slowly wean cities off centralized generation to distributed solar and wind power. (In the process, we've reimplemented the old superh architecture from scratch now the patents have expired, and released it as open hardware under a BSD license at http://nommu.org/jcore.) I was once linux-kernel documentation maintainer, made initramfs use tmpfs, co-founded Penguicon, inexplicably wrote stock market investment columns for The Motley Fool for a few years long ago, and youtube video of me throwing liquid nitrogen into a swimming pool has been viewed over 10 million times.

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