ZPUFlex
mini-rv32ima
| ZPUFlex | mini-rv32ima | |
|---|---|---|
| 1 | 16 | |
| 34 | 1,498 | |
| - | - | |
| 10.0 | 6.6 | |
| over 8 years ago | 16 days ago | |
| VHDL | C | |
| - | MIT License |
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ZPUFlex
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Zylin ZPU: The worlds smallest 32 bit CPU with GCC toolchain
For me the most interesting thing about ZPU is that its instructions are only a single byte each, which means that while the CPU is much smaller than most RISC-V implementations, the code density is significantly better than RV32 code. (Compressed RISC-V code can beat ZPU, but adding the compressed instruction set to a RISC-V core increases its size quite a bit.)
I did play with the ZPU quite a bit 8 or 9 years ago, and forked the ZPU Small variant to create ZPUFlex [0]. I borrowed a number of ideas from ZPU when I created my own CPU Project, EightThirtyTwo [1], some years later.
[0] https://github.com/robinsonb5/ZPUFlex
mini-rv32ima
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Driver hack lets you run Linux after Windows BSODs, no reboot required
It does emulate RiscV that runs Linux, so why not call it a Linux emulator?
Though https://github.com/cnlohr/mini-rv32ima is indeed impressively small. Here's the dispatch switch-case: https://github.com/cnlohr/mini-rv32ima/blob/eeeaaa0609558c84...
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I boot Linux 6.1 on atmega328p
Yes you read it correctly. This is not April Joke. This is real Linux 6.1 running on real atmega328p clocked at 16MHz. Basically it's an optimized version of mini-rv32ima running on Arduino UNO with SD card swap. The entire code is written in C99.
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Writing a Really Tiny RISC-V Emulator: rv32ima/Zifencei+Zicsr... sort of
repo:
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Fun, or pure magic: RISC-V rv32ima emulator running busybox linux
git clone https://github.com/cnlohr/mini-rv32ima.git cd mini-rv32ima/ git reset --hard f5154edc2894c2624361ef26ad8c3e6ebd23dea3 # workaround for now make testdlimage
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Zylin ZPU: The worlds smallest 32 bit CPU with GCC toolchain
Not GP, but this might scratch your itch https://github.com/cnlohr/mini-rv32ima
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RVVM – The RISC-V Virtual Machine
So is this, even more so in my taste:
https://github.com/cnlohr/mini-rv32ima/blob/master/mini-rv32...
A RISC-V emulator in one include file.
- Making an emulator: Questions
- Open-source RISC-V simulator suggestions?
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Embedded Systems Weekly #129
Writing a Really Tiny RISC-V Emulator It's maybe the tiniest RISC-V emulator around. It is all in one unique function of ~400 lines, but it can run Linux and various executables on it. The tiny C header-only risc-v emulator code is on Github with everything needed to make it run yourself. It's a really impressive work which deserves to be highlighted,
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I got Linux running INSIDE of Team Fortress 2!
riscv-vscript is a port of mini-rv32ima to VScript (Squirrel3) that:
What are some alternatives?
minimax - Minimax: a Compressed-First, Microcoded RISC-V CPU
8086tiny - 8086tiny interpreter by Adrian Cable, taken from http://www.megalith.co.uk/8086tiny/
zpu - The Zylin ZPU
EightThirtyTwo - An experimental CPU core with 8-bit instruction words and 32-bit registers
Ripes - A graphical processor simulator and assembly editor for the RISC-V ISA
pinwheel - A tiny RISC-V processor for hard-real-time FPGA-based applications.
whisper
zpugcc
riscv-vm - A Small RISC-V Virtual Machine