So it turns out that blogging about something after the fact is pretty tough. I really wanted to blog about my PoC port of UEFI to the OpenPower ecosystem, but it's incredibly difficult to go back and try to systematize something that's been a few years back.
So let's try this again. This time, our victim will be a G4 12" PowerBook6,8 with a 7447A. That's a 32-bit PowerPC. Now, I'll go in small steps and document everything. For added fun, we'll begin porting on the target itself, at least until that gets too tedious. Also, I've a few OldWorld machines, a spare G4 12" for parts and a G5, so hopefully this odyssey won't be interrupted by old and failing hardware ;-).
Keep in mind that each part is checked in along with the source code, so look at the entire commit. Each blog post will focus on the most important details.
- Part 1 - preparing the environment and build tools
- Part 2 - making the build system aware of the new architecture
- Part 3 - where we almost build the dummy application
- Part 4 - where we try to generate an EFI binary
- Part 5 - where we finally start writing the EFI boot code
- Part 6 - where we bring real logging to our IPL and fight endian-unsafe code
- Part 7 - where we being turning our IPL into a DXE loader