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OpenSPARC seems to have had open 64-bit designs released before RISC-V was launched? "In March 2006, the complete design of Sun Microsystems' UltraSPARC T1 mic

OpenSPARC seems to have had open 64-bit designs released before RISC-V was launched? "In March 2006, the complete design of Sun Microsystems' UltraSPARC T1 microprocessor was released-in open-source form, it was named OpenSPARC T1. In early 2008, its successor, OpenSPARC T2, was also released in open-source form. These were the first (and still only) 64-bit microprocessors ever open-sourced. " -https://www.oracle.com/servers/technologies/opensparc.html https://www.oracle.com/servers/technologies/opensparc.html

panick21_ 3y ago
The 32bit is a standard 'IEEE Standard 1754-1994'. The 64 bit implementation was released by SPARC International but its not a standard. As far as I know without joining SPARC International you are not allowed to commercially use SPARC 64bit commercially. There might be open implementations, but that doesn't mean you can be sued for using the architecture.