RISCV 开源内核收集

1. 蜂鸟E200    https://github.com/SI-RISCV

2. pilpino    https://github.com/pulp-platform/pulpino

3. rocket   https://github.com/freechipsproject/rocket-chip

4. boom  https://github.com/riscv-boom/riscv-boom

5 SweRV  https://github.com/westerndigitalcorporation/swerv_eh1

后续更新这5个cpu详细分析细节