Probably not the answer you wanted, but I assume from a poc/toy bootloader. I wasn't disciplined enough to go further, but I did play around getting a toy OS working, and stopped a little bit past that part.
This effort, from a one man show, is amazing.
So far I've learned C [0], x86 asm [1], read OSTEP [2] and begun hacking on xv6 ...and I still feel like I have years to go.
[0] http://www.knking.com/books/c2/index.html
[1] http://opensecuritytraining.info/
[2] http://pages.cs.wisc.edu/~remzi/OSTEP/
Probably not the answer you wanted, but I assume from a poc/toy bootloader. I wasn't disciplined enough to go further, but I did play around getting a toy OS working, and stopped a little bit past that part.
This effort, from a one man show, is amazing.