Yaboot

Yaboot (yet another boot loader) is a bootloader for PowerPC-based hardware running Linux.
History.
In 2009, maintenance by Paul Nasrat was handed over to Tony Breeds.
Hardware support.
Support includes the New World ROM Macintosh and IBM RS/6000 systems. It does not support the "OldWorld" PowerMacs.
Booting procedure.
It is built to run within the Open Firmware layer common to most such systems instead of working as a Mac OS 9 program like its predecessor BootX.
Yaboot is similar to LILO and GNU GRUB. Yaboot uses the following steps to boot: