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830b7f7206
Restructure the existing documentation to group the content by intended audience. This produces four sections: * An introduction section, relevant to "newcomers" to Ibex. * An user guide, intended for hardware designers (integrators) and software developers who want to integrate Ibex, and develop software for it. * A reference guide, which provides background information on the design. This section is essential when working on Ibex, and also documents our design decisions. * A developer guide aimed at people modifying Ibex itself. It consists mostly of process and tool documentation: how to run the verification after a code change, how to use GitHub, etc. This commit is large, but text is mostly unchanged. A couple of introductions and tables of content were added, but no significant changes to the text have been made. These will be done in follow-ups. Signed-off-by: Philipp Wagner <phw@lowrisc.org>
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History
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Ibex development started in 2015 under the name "Zero-riscy" as part of the `PULP platform <https://pulp-platform.org>`_ for energy-efficient computing.
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Much of the code was developed by simplifying the RV32 CPU core "RI5CY" to demonstrate how small a RISC-V CPU core could actually be `[1] <https://doi.org/10.1109/PATMOS.2017.8106976>`_.
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To make it even smaller, support for the "E" extension was added under the code name "Micro-riscy".
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In the PULP ecosystem, the core is used as the control core for PULP, PULPino and PULPissimo.
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In December 2018 lowRISC took over the development of Zero-riscy and renamed it to Ibex.
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References
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----------
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1. `Schiavone, Pasquale Davide, et al. "Slow and steady wins the race? A comparison of ultra-low-power RISC-V cores for Internet-of-Things applications." 27th International Symposium on Power and Timing Modeling, Optimization and Simulation (PATMOS 2017) <https://doi.org/10.1109/PATMOS.2017.8106976>`_
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