Gentoo Grub2 on OpenFirmware (PowerPC) New Kernel Update Script

kernel-update.sh

#!/bin/bash
set -euo pipefail
# Adapted from: https://wiki.gentoo.org/wiki/GRUB_on_Open_Firmware_(PowerPC)

# Re-generate grub.cfg
grub-mkconfig -o /boot/grub/grub.cfg

# Make new OF grub img
grub-mkimage --prefix=/boot/grub --format=powerpc-ieee1275 --config=/boot/NWBB/grub-initial.cfg --output=/boot/NWBB/grub.img `cat /boot/NWBB/grub_mod-minimal.list`

# Mount the hfs bootblock
hmount /dev/sdb2

# Copy boot files
hcopy -r /boot/NWBB/grub-initial.cfg :grub:grub.cfg
hcopy -r /boot/NWBB/grub.img :grub:grub.img
hcopy -r /boot/NWBB/ofboot.b :grub:ofboot.b

# Set boot attributes
hattrib -c UNIX -t tbxi :grub:ofboot.b
hattrib -b :grub

# Unmount bootblock
humount

# Set as default boot device
# This os is on the second drive "sd1", and the Open Firmware partion is partition 2
nvram --update-config boot-device='sd1:2,\\:tbxi'

echo "Bootloader updated"