I'm not sure if I missed a step somewhere, but I managed to get it working in the end by using this guide, with slightly different commands:
hformat -l bootstrap /dev/sda2 (-l bootstrap not in the wiki here)
grub-install --macppc-directory=/boot/grub /dev/sda2 (none of the arguments are in the wiki here)
hattrib -t tbxi -c UNIX :System:Library:CoreServices:BootX (completely different after -t tbxi)
hattrib -b :System:Library:CoreServices (completely different after -b)
I have no idea which one helped, I also think I forgot to set the partition name to bootstrap originally, it's also possible that was the only issue. Still, this worked, so I log it here if someone (including myself in the future) runs into something similar.
I'm not sure if I missed a step somewhere, but I managed to get it working in the end by using this guide, with slightly different commands:
hformat -l bootstrap /dev/sda2(-l bootstrap not in the wiki here)grub-install --macppc-directory=/boot/grub /dev/sda2(none of the arguments are in the wiki here)hattrib -t tbxi -c UNIX :System:Library:CoreServices:BootX(completely different after-t tbxi)hattrib -b :System:Library:CoreServices(completely different after-b)I have no idea which one helped, I also think I forgot to set the partition name to bootstrap originally, it's also possible that was the only issue. Still, this worked, so I log it here if someone (including myself in the future) runs into something similar.