Aside from the Tanenbaum Minix book, try xv6. https://pdos.csail.mit.edu/6.828/2019/xv6/book-riscv-rev0.pdf https://pdos.csail.mit.edu/6.828/2019/xv6/book-risc

Aside from the Tanenbaum Minix book, try xv6. https://pdos.csail.mit.edu/6.828/2019/xv6/book-riscv-rev0.pdf https://pdos.csail.mit.edu/6.828/2019/xv6/book-riscv-rev0.pd... https://pdos.csail.mit.edu/6.828/2019/xv6.html https://pdos.csail.mit.edu/6.828/2019/xv6.html