Permission to use / remix sifive-uart code

[liuyu81]

Hi,

We are working on a Python-binding for Spike (libriscv.so), and would pledge to use sfive-uart as a sample MMIO implementation.

Our python-binding targets two use cases, (1) unit-test C++ MMIO devices as Python objects (with tools such as pytest), and (2) write MMIO devices in Python (that can be registered to, and used with, vanilla Spike).

For case (1), we plan to use sifive-uart as a sample software-under test. For case (2), we plan to rewrite sifive-uart in Python to give a sense of how it works.

Could anyone help with clarifiying the licensing / copyright of code in this repository?