> using an entirely different CPU core, the Berkeley Rocket Chip Nope, the U54 and E31 are both Rocket, just with different parameters/configurations. SiFive

> using an entirely different CPU core, the Berkeley Rocket Chip Nope, the U54 and E31 are both Rocket, just with different parameters/configurations. SiFive has continued to improve Rocket and contribute their improvements back to the available source code.