There are several more docs under different directories which is very useful:
https://github.com/SI-RISCV/e200_opensource/tree/master/doc/ 蜂鸟E203快速上手介绍.pdf
https://github.com/SI-RISCV/e200_opensource/tree/master/doc/ 蜂鸟E203开源内核简介.pdf
https://github.com/SI-RISCV/e200_opensource/tree/master/doc/ 蜂鸟E203开源SoC简介.pdf
https://github.com/SI-RISCV/e200_opensource/tree/master/boards/ 蜂鸟FPGA开发板和JTAG调试器介绍.pdf
https://github.com/SI-RISCV/hbird-e-sdk/tree/master/software/FreeRTOSv9.0.0/ 蜂鸟E203移植FreeRTOS.pdf
The Hummingbird E203 Core was deeply introduced in the published Book (蜂鸟E200处理器核在如下出版中文书籍中进行深入浅出的分析讲解):
《手把手教你设计CPU：RISC-V处理器》（已经上市，请在京东、淘宝、当当上搜索 RISC-V关键字）
In order to easy user to study RISC-V in a quick and easy way, we have made a dedicated FPGA-Board and JTAG-Debugger. Diagram as below:
The detailed introduction and the relevant documentation can be seen from https://github.com/SI-RISCV/e200_opensource/tree/master/boards directory.