this post was submitted on 26 Dec 2023
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there are use cases, such as security, where you want as few instructions as possible, so a full ARM processor isn't the best idea. You may want to read the threat model page: https://tillitis.se/products/threat-model/
On the contrary, RISC-V is typically bigger and less efficient than Cortex-M7 on the Teensy.
There are 10-cent ARM Cortex M0+ processors (M0+ being the smallest ARM). M7 is kinda-small. ARM scales to different sizes and power-efficiencies.
in this case the instruction set is extremely small (and includes open source verilog, so you could even fab it yourself)
quote from the website:
https://developer.arm.com/documentation/dui0646/c/The-Cortex-M7-Instruction-Set/Instruction-set-summary
So is the Cortex M7. The entirety of the M0+, M4, and M7 microcontroller cores are very, very small ARMs.
Hmmm. Okay, so its an FPGA Risc-V then.
That's kind of sad, that means there's no hope that its as power-efficient as a proper ASIC core like ARM-M7.