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Update marchid, mvendorid, mimpid values in docs (#278)

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* Update marchid, mvendorid, mimpid values in docs

* Update getting_started.rst

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Co-authored-by: Davide Schiavone <davide@openhwgroup.org>
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Mohammed Eladawy 2025-02-05 19:13:33 +02:00 • committed by GitHub
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doc/02_user/getting_started.rst
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@ -12,9 +12,8 @@ The RISC-V Privileged Architecture specifies several read-only CSRs that identif
These are ``mvendorid``, ``marchid`` and ``mimpid``.
The fixed, read-only values for these CSRs are defined in :file:`rtl/cve2_pkg.sv`.
Implementers should carefully consider appropriate values for these registers.
Ibex, as an open source implementation, has an assigned architecture ID (``marchid``) of 22.
Ibex, as an open source implementation, has an assigned architecture ID (``marchid``) of 0x23 (equivalent to 0d35).
(Allocations are specified in `marchid.md of the riscv-isa-manual repository <https://github.com/riscv/riscv-isa-manual/blob/master/marchid.md>`_.)
If significant changes are made to the micro-architecture a different architecture ID should be used.
The vendor ID and implementation ID (``mvendorid`` and ``mimpid``) both read as 0 by default, meaning non-implemented.
Implementers may wish to use other values here.
The vendor ID and implementation ID (``mvendorid`` and ``mimpid``). The vendor ID (mvendorid) is assigned the value 0x602 and the implementation ID (mimpid) is assigned the value 0x0.
Please see the RISC-V Privileged Architecture specification for more details on what these IDs represent and how they should be chosen.