If you read Japanese, you might have seen the book “Design and Implementation of Microkernels” by [Seiya Nuda]. An appendix covers how to write your own operating system for RISC-V in a… ...

He's built a simple kernel for a Unix-like operating system that runs on an Intel 386 processor, and he wants to develop it further. The kernel eventually becomes Linux, which is released in 1994 ...