These are pretty new, and the prices are higher than other ISAs with
economies-of-scale and mostly long-amortized development costs (and
there's perhaps no loss-leaders or dumping for market share or lock-in,
like we sometimes see in industry).
The HiFive1 is more like a $60 Arduino or maybe RasPi:
https://www.sifive.com/boards/hifive1
The HiFive Unleashed, when combined with their Expansion Board, could be
used to make a workstation, but is pretty new, and costs thousands of
dollars:
https://www.sifive.com/boards/hifive-unleashed
I've seen "RISC-V" USB dongle-like boards, but the ones I've seen are
just little FPGA experimenter boards burnt with RISC-V logic.
That's what I found, last time I looked. Paulo or others might know
other boards.
There's also always emulators, and RISC-V logic you program yourself on
bigger general-purpose FPGA boards. (Programming FPGA yourself means
you're one small enhancement away from being able to call yourself a CPU
designer. :) If you do FPGA, it would help to try to use an open
toolchain, but I think the options for that are still relatively early
and improving. (Last I looked, the open toolchains would let you use
only a few small FPGAs, but I saw something the other day that suggests
the environment is improving, so look for the latest info/news, whenever
you start.)
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