Comment by ryao 14 hours ago
So far, patent lawsuits have been more of a problem for those using ARM designs (Qualcomm) than those using RISC-V designs. The Raspberry Pi foundation, Western Digital and Nvidia have successfully put RISC-V designs into their products without any issues. The first two even made their core designs open source (see Hazard3 and SweRV).
You're not free to copy SiFive's IP cores.
Open ISA != all implementations of it are free (although in RISC-V case, many are).
RISC-V already has taken off. There are billions of RISC-V cores shipped in consumer products every year. Adoption outside of the embedded MCU space is slower, but that is natural. Your FUD about SiFive is absurd. Hardware patents related to CPU design are typically ISA independent.
Anyone is free to make a RISC-V CPU without infringing on SiFive’s IP.
Not so simplistic, see the XiangShan HotChips presentation:
https://hc2024.hotchips.org/assets/program/conference/day2/2...
SuperH is owned by Hitachi. You cannot use them without a license from Hitachi as far as I know. RISC-V is unique in that its creator permits anyone to make and use RISC-V cores royalty free. It also supports 64-bit, which SuperH never did.
In any case, you should probably stop writing before you shove your foot any deeper into your mouth.
How are SiFive going to protect their IP when everyone is free to copy it?
Patents.