I have some reservations towards Open-V, I would be careful before backing it:
https://www.reddit.com/r/linux/comments/5ekuck/openv_the_wor...
https://www.reddit.com/r/cpudesign/comments/5eep88/the_world...
https://www.reddit.com/r/linux/comments/5ekuck/openv_the_wor...
https://www.reddit.com/r/cpudesign/comments/5eep88/the_world...
Who is calling this a PC? OpenV seems to be marketing itself as a microcontroller, it keeps comparing itself to Arduino.
I should also add that the "boring" mips is right now significantly more open than riscv, more mature and easier to get hold of.