libreboot/projects/grub/install/vesafb/grub.cfg

set prefix=(memdisk)/boot/grub

insmod nativedisk
insmod ehci
insmod ohci
insmod uhci
insmod usb
insmod usbms
insmod usbserial_pl2303
insmod usbserial_ftdi
insmod usbserial_usbdebug
insmod png

# Serial and keyboard configuration, very important.
serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1
terminal_input --append  serial
terminal_output --append serial
terminal_input --append at_keyboard
terminal_output --append cbmemc

gfxpayload=keep
terminal_output --append gfxterm

# Prettify GRUB
background_image (cbfsdisk)/background.png
loadfont (cbfsdisk)/dejavusansmono.pf2

# Default to first option, automatically boot after 1 second
set default="0"
set timeout=1

# This is useful when using 'cat' on long files on GRUB terminal
set pager=1

function try_user_config {
	set root="${1}"
	for dir in boot grub grub2 boot/grub boot/grub2; do
		for name in libreboot_ autoboot_ librecore_ coreboot_ ''; do
			if [ -f /"${dir}"/"${name}"grub.cfg ]; then
                unset superusers
				configfile /"${dir}"/"${name}"grub.cfg
			fi
		done
	done
}

function search_grub {
	for i in 0 1; do
		# raw devices
		try_user_config "(${1}${i})"
		for part in 1 2 3 4 5; do
			# MBR/GPT partitions
			try_user_config "(${1}${i},${part})"
		done
	done
}

function try_isolinux_config {
	set root="${1}"
	for dir in '' /boot; do
		if [ -f "${dir}"/isolinux/isolinux.cfg ]; then
			syslinux_configfile -i "${dir}"/isolinux/isolinux.cfg
		elif [ -f "${dir}"/syslinux/syslinux.cfg ]; then
			syslinux_configfile -s "${dir}"/syslinux/syslinux.cfg
		fi
	done
}

function search_isolinux {
	for i in 0 1; do
		# raw devices
		try_isolinux_config "(${1}${i})"
		for part in 1 2 3 4 5; do
			# MBR/GPT partitions
			try_isolinux_config "(${1}${i},${part})"
		done
	done
}

menuentry 'Load Operating System (incl. fully encrypted disks)  [o]' --hotkey='o' {
# GRUB2 handles (almost) every possible disk setup, but only the location of
# /boot is actually important since GRUB2 only loads the user's config.

# LVM, RAID, filesystems and encryption on both raw devices and partitions in
# all various combinations need to be supported. Since full disk encryption is
# possible with GRUB2 as payload and probably even used by most users, this
# configuration tries to load the operating system in the following way:

# 1. Look for user configuration on unencrypted devices first to avoid
# unnecessary decryption routines in the following order:

#	1) raw devices and MBR/GPT partitions
	search_grub ahci
    search_grub ata
#	2) LVM and RAID which might be used accross multiple devices
	lvm="lvm/matrix-rootvol lvm/matrix-boot"
	raid="md/0 md/1 md/2 md/3 md/4 md/5 md/6 md/7 md/8 md/9"
	for vol in ${lvm} ${raid}; do
		try_user_config "(${vol})"
	done
# 2. In case no configuration could be found, try decrypting devices. Look
# on raw crypto devices as well as inside LVM volumes this time.

#	The user will be prompted for a passphrase if a LUKS header was found.
	for dev in ahci0 ata0 usb0 ${lvm}; do
		cryptomount "(${dev})"
	done
#	3) encrypted devices/partitions
	for i in 0 1; do
		for part in 1 2 3 4 5; do
            for type in ahci ata; do
    			cryptomount "(${type}${i},${part})"
            done
		done
	done

#	3) encrypted devices/partitions
	search_grub crypto
#	4) LVM inside LUKS containers
	for vol in ${lvm}; do
		try_user_config "(${vol})"
	done

    # Last resort, if all else fails
    set root=ahci0,1
    for p in / /boot/; do
        if [ -f "${p}vmlinuz" ]; then
            linux ${p}vmlinuz root=/dev/sda1 rw
            if [ -f "${p}initrd.img" ]; then
                initrd ${p}initrd.img
            fi
        fi
    done

    # Last resort (for GA-G41-ES2L which uses IDE emulation mode for SATA)
    set root=ata0,1
    for p in / /boot/; do
        if [ -f "${p}vmlinuz" ]; then
            linux ${p}vmlinuz root=/dev/sda1 rw
            if [ -f "${p}initrd.img" ]; then
                initrd ${p}initrd.img
            fi
        fi
    done
}

menuentry 'Search ISOLINUX menu (AHCI)  [a]' --hotkey='a' {
	search_isolinux ahci
}

menuentry 'Search ISOLINUX menu (USB)  [u]' --hotkey='u' {
	search_isolinux usb
}

menuentry 'Search ISOLINUX menu (CD/DVD)  [d]' --hotkey='d' {
	insmod ata
	for dev in ata0 ata1 ata2 ata3 ahci1; do
		try_isolinux_config "(${dev})"
	done
}

menuentry 'Load test configuration (grubtest.cfg) inside of CBFS  [t]' --hotkey='t' {
	set root='(cbfsdisk)'
	configfile /grubtest.cfg
}

menuentry 'Search for GRUB2 configuration on external media  [s]' --hotkey='s' {
	search_grub usb
}

menuentry 'Poweroff  [p]' --hotkey='p' {
	halt
}

menuentry 'Reboot  [r]' --hotkey='r' {
	reboot
}