Quoting the post:
Experimental PCI Expansion ROM “OS” Code Migrated to GitHub
The code for the experimental PCI Expansion ROM “OS” explained in the Building a “Kernel” in PCI Expansion ROM article is now in GitHub: https://github.com/pinczakko/PCI-Expansion-ROM-OS. I made some changes to make it compile-able in current version of Nasm and GCC. I’ve only tested the compilation in Arch Linux (x86-64). I’m not sure it will work in other Linux distros. Give it a try ;-). Quick skim over the resulting binary seems to indicate the result is OK. I’m going to check it with a disassembler later on. If anyone wants to help me with that, please do so and post your result in the comment section below. Many of you might be aware that the code has been modified into pure GCC-only code in the Low Cost Embedded x86 Teaching Tool article. I need to migrate that code as well. But, I’m quite sure it will require special GCC version to be able to emit the correct binary, akin to the one used by Coreboot. I’ll post an update once I’ve updated that one as well. Anyway, it’s rather surprising to me that using Nasm + GCC is more future-proof compared to using GCC alone. It shows that you can’t be really sure about the future-proof-ness of the toolset you used for software development.