serv
Projects
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serv
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RISC-V support in Android just got a big setback
> Right now, most devices on the market do not support the C extension
This is not true and easily verifiable.
The C extension is defacto required, the only cores that don't support it are special purpose soft cores.
C extension in the smallest IP available core https://github.com/olofk/serv?tab=readme-ov-file
Supports M and C extensions https://github.com/YosysHQ/picorv32
Another sized optimized core with C extension support https://github.com/lowrisc/ibex
C extension in the 10 cent microcontroller https://www.wch-ic.com/products/CH32V003.html
This one should get your goat, it implements as much as it can using only compressed instructions https://github.com/gsmecher/minimax
- SERV – The SErial RISC-V CPU
- SERV: A bit-serial RISC-V core
- SERV – open-source Tiny SErial RISC-V CPU
- How many LUT for an 8 bit CPU?
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Minimax: a Compressed-First, Microcoded RISC-V CPU
In short: it works, though the implementation lacks the crystal clarity of FemtoRV32 and PicoRV32. The core is larger than SERV but has higher IPC and (very arguably) a more conventional implementation. The compressed instruction set is easier to expand into regular RV32I instructions than it is to execute directly.
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Apple to Move a Part of Its Embedded Cores to RISC-V
https://github.com/olofk/serv
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I have created a Reddit community about PicoBlaze soft processor...
As for the size advantage: this mattered more when LUTs were precious and when PicoBlaze's competition was either similarly unorthodox (J1 Forth CPU) or several times larger (MicroBlaze). Nowadays, there are very small RISC-V cores like FemtoRV32 Quark or SERV. RISC-V benefits from mainstream open-source tooling and has momentum that's hard to beat.
- Microchip to develop 12-core RISC-V processor for NASA
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RISC-V announces first new specifications of 2022 adding to 16 ratified in 2021
The RISC-V spec does allow non-trapping behavior and SeRV in particular has non-trapping behavior, which is an important part of how it can fit into 200 4-input LUTs.
https://github.com/olofk/serv#good-to-know
Projects
- Processor's microcode pipeline from die analysis
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Building a Frankenstein 64
Nice work and thanks for the writeup. Ted Fried has a variety of microsequencer based CPU cores based on FPGA (and ARM) and I think they are quite good.
https://microcorelabs.wordpress.com/2021/04/19/mcl64-worlds-...
https://github.com/MicroCoreLabs/Projects
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Show HN: Tenebra game PC port of popular Commodore 64 game
At that point you might as well go MCL64 Teensy replica https://microcorelabs.wordpress.com/2021/04/19/mcl64-worlds-...
"comparing the Super CPU accelerated to 20Mhz and the MCL64 in its accelerated mode, the MCL64 is roughly 2X faster than the Super CPU"
https://microcorelabs.wordpress.com/2021/04/16/mcl64-mos-651...
https://microcorelabs.wordpress.com/2021/03/14/mcl64-commodo...
Fully open source https://github.com/MicroCoreLabs/Projects/tree/master/MCL64
- Macintosh booting!
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Apple to Move a Part of Its Embedded Cores to RISC-V
There is a difference, but not much!
https://github.com/MicroCoreLabs/Projects/tree/master/MCL51 - ANNOUNCE: 68000 test cases
- What's everyone currently working on?
What are some alternatives?
neorv32 - :rocket: A tiny, customizable and extensible MCU-class 32-bit RISC-V soft-core CPU and microcontroller-like SoC written in platform-independent VHDL.
picorv32 - PicoRV32 - A Size-Optimized RISC-V CPU
riscv-cores-list - RISC-V Cores, SoC platforms and SoCs
decaf-emu - Researching Wii U emulation.
IronOS - Open Source Soldering Iron firmware
XTulator - XTulator is a portable, open source x86 PC emulator currently supporting the 8086 instruction set and 80186 extensions.
fusesoc - Package manager and build abstraction tool for FPGA/ASIC development
temu-vsb - TEMU ("Tandy Emulator") and VSB ("Virtual Sound Blaster"), two nifty MS-DOS TSR utilities originally developed by Andrew Zabolotny (Андрей Заболотный).
neo430 - :computer: A damn small msp430-compatible customizable soft-core microcontroller-like processor system written in platform-independent VHDL.
gba-tests - A collection of Game Boy Advance tests.
psram-tang-nano-9k - An open source PSRAM/HyperRAM controller for Sipeed Tang Nano 9K / Gowin GW1NR-LV9QN88PC6/15 FPGA
SNES - SNES Assembly Programming