On Fri, Aug 16, 2019 at 9:56 AM Richard Miller <9f...@hamnavoe.com> wrote: > > Do you mean something like BlackIce II (I'm under RV32I)? > > Yes, I have tried various soft cores on BlackIce (including > one of my own design, for fun); also real silicon HiFive-1. > So far none of these has had an MMU, which is required for > Plan 9 (though not for Inferno).
Speaking of RISC-V with MMU for Plan 9, Kendryte K210 is a 28nm MCU with dual core RV64GC and Linux capable MMU (!). It has 8MB onchip SRAM and also NN, FFT accelerators. I think that makes a good platform for Plan 9 on RISC-V, on a real silicon. It also has a lot of really cheap evaluation board options available. (The only other currently available RV64GC w/ MMU silicon is the Hifive unleashed, which is very expensive.) The only major problem of K210 is that its IO capabilities are fairly limited and you need external Ethernet/Wifi solutions on SPI bus, which is likely slow.
