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GRUB Installation on NewWorld Macs

This is a handbook guide submission to use GRUB2 on PPC32 and PPC64 macs to replace the outdated yaboot section which no longer works.

Using GRUB


root #emerge --ask sys-boot/grub

Setup bootstrap partition

First, prepare the bootstrap partition that was created created during the preparing the disk step. Following the example, this partition should be /dev/sda2. Optionally, confirm this by using parted:

Replace /dev/sda with the correct device if required.

root #parted /dev/sda print
Model: ATA Patriot Burst El (scsi)

Disk /dev/sda: 120GB

Sector size (logical/physical): 512B/512B

Partition Table: mac

Disk Flags:

Number  Start   End     Size    File system  Name       Flags
 1      512B    32.8kB  32.3kB               Apple
 2      32.8kB  852kB   819kB   hfs          bootstrap  boot
 3      852kB   538MB   537MB   ext4         Boot
 4      538MB   54.2GB  53.7GB  ext4         Gentoo

In this output, partition 2 has the bootstrap information so /dev/sda2 is the correct path to use.

Format this partition as HFS using the hformat command which is part of the sys-fs/hfsutils package:

root #dd if=/dev/zero of=/dev/sda2 bs=512
root #hformat -l bootstrap /dev/sda2

Create a directory to mount the bootstrap partition and then mount it:

root #mkdir /boot/NWBB
root #mount --types hfs /dev/sda2 /boot/NWBB

Setup GRUB

root #grub-install --macppc-directory=/boot/NWBB /dev/sda2

If it installs without errors, unmount the bootstrap:

root #unmount /boot/NWBB

Next, bless the partition so it will boot:

root #hmount /dev/sda2
root #hattrib -t tbxi -c UNIX :System:Library:CoreServices:BootX
root #hattrib -b :System:Library:CoreServices
root #humount

Finally, build the grub.cfg file:

root #grub-mkconfig -o /boot/grub/grub.cfg