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I see that what they recommend for the freedom platform

https://www.sifive.com/products/freedom/

today, is a dev board

https://dev.sifive.com/freedom-soc/evaluate/fpga/

that costs around 3500 USD:

https://www.avnet.com/shop/us/p/kits-and-tools/development-k...

Do anyone here know what kind of "classic pc" performance one is likely to get out of a board like that? Could you get on the order of low-end pc (~500 dollar soc / netbook with real gigabit ethernet, sata6 and usb3) from something like that, if paired up with a reasonable cpu design?



The $3500 board is a lot, yes. There is also a $99 "Arty" board that is enough to run what is in the HiFive1, and I think even to add an MMU and run Linux. The $3500 one has enough space to do multiple cores, FPU and so forth as well.

Both the $99 and $3500 FPGA boards run a Rocket CPU at 65 MHz, which is pretty slow, though faster than you get with a software cycle-accurate simulator on a workstation.


A somewhat speed-optimized IP CPU core [1] runs at 600DMIPs on a Virtex7. I would hope that SiFive is in the same ballpark, but it's probably slower.

Even in a best-case scenario, this is nowhere near a low end consumer PC.

edit: For reference, my 5 years old Thinkpad x230 does around 7400 DMIPs per core.

[1] - https://www.xilinx.com/products/design-tools/microblaze.html


Well, that actually sounds a lot better than I feared - I have a aging aspire acer one that works fine as a lightweight Linux desktop.




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