RISC-V Business: Testing StarFive's VisionFive 2 SBC

Re:RISC-V Business: Testing StarFive's VisionFive 2 SBC by whitehexagon on Friday March 03, 2023 @01:39PM (#35013407)

I purchased a DE10-nano last year with the plan to try some FPGA RISC-V based development... but got lost in the number of extensions and versions of RISC-V kicking around. Has anyone tried this? I'd also be interested how it compares performance wise to the above, and Pi4, see if it worth the effort. Anyway at least it got some good use with MiSTer :) I kinda hope Raspberry adopts RISC-V on their next SBC, but hopefully with more open hardware.

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Re:RISC-V Business: Testing StarFive's VisionFive 2 SBC by jburgess777 on Friday March 03, 2023 @03:10PM (#35014407)

The repo below has support for building a 32bit RISC-V CPU for de10nano. It also includes information about booting Linux.

https://github.com/litex-hub/linux-on-litex-vexriscv

The CPU will likely have a clock speed around 100Mhz, far slower than the 1.5Ghz 64bit cores on the VisionFive 2 or Pi4. The FPGA might still be useful if you want to customize the CPU or integrate other custom hardware.

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Re:RISC-V Business: Testing StarFive's VisionFive 2 SBC by whitehexagon on Saturday March 04, 2023 @04:07AM (#35019421)

Open source tool chain and open source cores, wow, nice progress since I last looked into this.

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Re:RISC-V Business: Testing StarFive's VisionFive 2 SBC by IshKebab on Saturday March 04, 2023 @06:30AM (#35020085)

Yeah unfortunately there isn't really a great place that lists all the extensions with links and ratification status.

But anyway there is a sort of standard set of extensions that "application processors" (I guess CPUs that want to run precompiled code) should support:

https://github.com/riscv/riscv-profiles/blob/main/profiles.a...

The 22 indicates the year.

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Re:RISC-V Business: Testing StarFive's VisionFive 2 SBC by whitehexagon on Saturday March 04, 2023 @02:55PM (#35023911)

thanks, so for something like the reviewed board above, how would RV64GC map into one of those profiles, or set of supported instructions?

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Re:RISC-V Business: Testing StarFive's VisionFive 2 SBC by brucehoult on Sunday March 05, 2023 @10:03PM (#35037056)

RV64GC expands into RV64I + M + A + F + D + C. The CPU in this board also has the Zba and Zbb extensions (which together with a couple of others make up what was originally envisioned as the "B" extension, but it was decided to split it up).

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Re:RISC-V Business: Testing StarFive's VisionFive 2 SBC by snvzz on Saturday March 04, 2023 @06:22PM (#35025528)

>Yeah unfortunately there isn't really a great place that lists all the extensions with links and ratification status.

RISC-V's wiki specification status page[0] is about as good as it gets.

0. https://wiki.riscv.org/display/HOME/Specification+Status

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