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> That doesn't mean you can just slap a RISC-V decoder on an ARM chip and it will magically work though.

Raspberry Pi RP2350 already ships with ARM and RISC-V cores. https://www.raspberrypi.com/products/rp2350/

It seems that the RISC-V cores don't take much space on the chip: https://news.ycombinator.com/item?id=41192341

Of course, microcontrollers are a different from mobile CPUs, but it's doable.

That's not really comparable. Raspberry Pi added entirely separate RISC-V cores to the chip, they didn't convert an ARM core design to run RISC-V instructions.

What is being discussed is taking an ARM design and modifying it to run RISC-V, which is not the same thing as what Raspberry Pi has done and is not as simple as people are implying here.

Reply on news.ycombinator.com