RISC-V 从这里开始

RISC-V：读作risk-five，是一个开源的CPU指令集架构

zephyr：开源操作系统

linux：没什么好说的。

risc-pk：The RISC-V Proxy Kernel。解释如下：is a lightweight application execution environment that can host statically-linked RISC-V ELF binaries.  It is designed to support tethered RISC-V implementations with limited I/O capability and and thus handles I/O-related system calls by proxying them to a host computer.

BBL ：the Berkeley Boot Loader。

linux相关开源基础库对RISC-V的支持

binutils: upstreamed (2.28 is the first release with RISC-V support)

gcc: upstreamed (7.1 is the first release with RISC-V support)

glibc: upstreamed (2.27 is the first release with RISC-V support)

linux kernel: upstreamed (the architecture core code went into

kernel 4.15; kernel 4.19 contains all drivers necessary for booting a

simulated system to userland)

gdb: upstreamed in master (in the release process)

qemu: upstreamed (2.12 is the first release with RISC-V support)