diff --git a/.ci/shellcheck.sh b/.ci/shellcheck.sh
index 736af8c9a..4108e3775 100755
--- a/.ci/shellcheck.sh
+++ b/.ci/shellcheck.sh
@@ -20,6 +20,8 @@ sh_files="
 	./main/postmarketos-installkernel/installkernel-pmos
 	./main/postmarketos-mkinitfs/init.sh
 	./main/postmarketos-mkinitfs/init_functions.sh
+	./main/postmarketos-initramfs/init.sh
+	./main/postmarketos-initramfs/init_functions.sh
 	./main/postmarketos-mkinitfs-hook-debug-shell/20-debug-shell.sh
 	./main/postmarketos-mkinitfs-hook-netboot/netboot.sh
 	./main/postmarketos-update-kernel/update-kernel.sh
diff --git a/main/postmarketos-initramfs/00-default.modules b/main/postmarketos-initramfs/00-default.modules
new file mode 100644
index 000000000..a30d4e0e4
--- /dev/null
+++ b/main/postmarketos-initramfs/00-default.modules
@@ -0,0 +1,15 @@
+dm_crypt
+ext4
+crc32c_generic
+usb_f_rndis
+f2fs
+xts
+libaes
+aes
+evdev
+btrfs
+vfat
+nls_ascii
+nls_cp437
+nls_iso8859_1
+nls_utf8
diff --git a/main/postmarketos-initramfs/00-initramfs-base.dirs b/main/postmarketos-initramfs/00-initramfs-base.dirs
new file mode 100644
index 000000000..8728d0cb7
--- /dev/null
+++ b/main/postmarketos-initramfs/00-initramfs-base.dirs
@@ -0,0 +1,11 @@
+/bin
+/boot
+/dev
+/etc
+/lib
+/proc
+/sbin
+/sys
+/sysroot
+/tmp
+/usr
diff --git a/main/postmarketos-initramfs/00-initramfs-base.files b/main/postmarketos-initramfs/00-initramfs-base.files
new file mode 100644
index 000000000..993c0315a
--- /dev/null
+++ b/main/postmarketos-initramfs/00-initramfs-base.files
@@ -0,0 +1,9 @@
+/bin/busybox
+/bin/busybox-extras
+/bin/sh
+/etc/deviceinfo
+/usr/bin/unudhcpd
+/usr/sbin/kpartx
+/usr/sbin/telnetd
+/usr/share/mkinitfs/init.sh:/init
+/usr/share/mkinitfs/init_functions.sh:/init_functions.sh
diff --git a/main/postmarketos-initramfs/00-initramfs-extra-base.files b/main/postmarketos-initramfs/00-initramfs-extra-base.files
new file mode 100644
index 000000000..381cd68f9
--- /dev/null
+++ b/main/postmarketos-initramfs/00-initramfs-extra-base.files
@@ -0,0 +1,7 @@
+/lib/libz.so.1
+/sbin/btrfs
+/sbin/dmsetup
+/sbin/e2fsck
+/usr/sbin/parted
+/usr/sbin/resize2fs
+/usr/sbin/resize.f2fs
diff --git a/main/postmarketos-initramfs/APKBUILD b/main/postmarketos-initramfs/APKBUILD
new file mode 100644
index 000000000..30f1d18cd
--- /dev/null
+++ b/main/postmarketos-initramfs/APKBUILD
@@ -0,0 +1,72 @@
+# Maintainer: Oliver Smith <ollieparanoid@postmarketos.org>
+# Co-Maintainer: Clayton Craft <clayton@craftyguy.net>
+pkgname=postmarketos-initramfs
+pkgver=1.0.0
+pkgrel=0
+pkgdesc="Base files for the postmarketOS initramfs / initramfs-extra"
+url="https://postmarketos.org"
+depends="
+	busybox-extras
+	btrfs-progs
+	bzip2
+	cryptsetup
+	device-mapper
+	e2fsprogs
+	e2fsprogs-extra
+	f2fs-tools
+	lz4
+	multipath-tools
+	parted
+	postmarketos-fde-unlocker
+	postmarketos-mkinitfs
+	unudhcpd
+	xz
+	"
+source="
+	00-default.modules
+	00-initramfs-base.dirs
+	00-initramfs-base.files
+	00-initramfs-extra-base.files
+	init.sh
+	init_functions.sh
+	"
+arch="noarch"
+license="GPL-2.0-or-later"
+
+package() {
+	install -Dm644 "$srcdir/init_functions.sh" \
+		"$pkgdir/usr/share/mkinitfs/init_functions.sh"
+
+	install -Dm755 "$srcdir/init.sh" \
+		"$pkgdir/usr/share/mkinitfs/init.sh"
+
+	install -Dm644 "$srcdir"/00-initramfs-base.dirs \
+		-t "$pkgdir"/usr/share/mkinitfs/dirs/
+	mkdir -p "$pkgdir"/etc/mkinitfs/dirs
+
+	install -Dm644 "$srcdir"/00-default.modules \
+		-t "$pkgdir"/usr/share/mkinitfs/modules/
+	mkdir -p "$pkgdir"/etc/mkinitfs/modules
+
+	install -Dm644 "$srcdir"/00-initramfs-base.files \
+		-t "$pkgdir"/usr/share/mkinitfs/files/
+	mkdir -p "$pkgdir"/etc/mkinitfs/files
+
+	install -Dm644 "$srcdir"/00-initramfs-extra-base.files \
+		-t "$pkgdir"/usr/share/mkinitfs/files-extra/
+	mkdir -p "$pkgdir"/etc/mkinitfs/files-extra
+
+	mkdir -p "$pkgdir"/usr/share/mkinitfs/hooks
+	mkdir -p "$pkgdir"/usr/share/mkinitfs/hooks-extra
+	mkdir -p "$pkgdir"/etc/mkinitfs/hooks
+	mkdir -p "$pkgdir"/etc/mkinitfs/hooks-extra
+}
+
+sha512sums="
+bed319179bcd0b894d6267c7e73f2890db07bc07df71542936947dfb3bdb17fade8a7b4e7b577f278af4472464427bba07f75aff0a1e454a4167052c088f3b6a  00-default.modules
+399da6e61993f48c8a62c956bb15d294cac10bf003d84257efdf4a213ebc87bb51cdcd75c4675f51c3be832146b8f21a7c769bf3e94f574a5067f001662632a1  00-initramfs-base.dirs
+3c47e9169ee8cfe78e1a554cf325962f5425c41a0125dcba8561f377d8c52cbfccdd791b269656478c92604644fb286b1ee8df42db9f5a771657e415da35e619  00-initramfs-base.files
+e984cd3033ce8752ebc71127828b964b46259a5263c2ebfab32c1394b674bcff464862ff00b8e920d3d31386c54ca0b94f84bc77580d275ecfeea33e76c07ef4  00-initramfs-extra-base.files
+347637ba837c75d2e7c5e93b10364de6a784d70067c65dcc3b95277f5feb89fc9b243822022b2380846dd977c4a3f6f96877f547e6ffc7cd3051845d7907d6a1  init.sh
+6978bb42349bc318a4cd8894aff77de05ad3d70345a232e683fdcf98270e71087669d05f750f55256b1af3a3b747ce5e224aa939a43b5c61b9675d9dd44c9080  init_functions.sh
+"
diff --git a/main/postmarketos-initramfs/init.sh b/main/postmarketos-initramfs/init.sh
new file mode 100644
index 000000000..6a41a989a
--- /dev/null
+++ b/main/postmarketos-initramfs/init.sh
@@ -0,0 +1,66 @@
+#!/bin/sh
+# shellcheck disable=SC1091
+
+[ -e /hooks/10-verbose-initfs.sh ] && set -x
+
+. /etc/deviceinfo
+. ./init_functions.sh
+
+export PATH=/usr/bin:/bin:/usr/sbin:/sbin
+/bin/busybox --install -s
+/bin/busybox-extras --install -s
+
+# Mount everything, set up logging, modules, mdev
+mount_proc_sys_dev
+create_device_nodes
+setup_log
+setup_firmware_path
+# shellcheck disable=SC2154,SC2086
+[ -d /lib/modules ] && modprobe -a ${deviceinfo_modules_initfs} usb_f_rndis
+
+setup_mdev
+setup_dynamic_partitions "${deviceinfo_super_partitions:=}"
+setup_framebuffer
+show_splash "Loading..."
+mount_subpartitions
+run_hooks /hooks
+
+# Always run dhcp daemon/usb networking for now (later this should only
+# be enabled, when having the debug-shell hook installed for debugging,
+# or get activated after the initramfs is done with an OpenRC service).
+setup_usb_network
+start_unudhcpd
+
+mount_boot_partition /boot
+extract_initramfs_extra /boot/initramfs-extra
+setup_udev
+run_hooks /hooks-extra
+
+wait_root_partition
+delete_old_install_partition
+resize_root_partition
+unlock_root_partition
+resize_root_filesystem
+mount_root_partition
+
+# Mount boot partition into sysroot, so OpenRC doesn't need to do it (#664)
+umount /boot
+mount_boot_partition /sysroot/boot "rw"
+
+init="/sbin/init"
+setup_bootchart2
+
+# Switch root
+killall telnetd mdev udevd msm-fb-refresher 2>/dev/null
+umount /proc
+umount /sys
+umount /dev/pts
+umount /dev
+
+# shellcheck disable=SC2093
+exec switch_root /sysroot "$init"
+
+echo "ERROR: switch_root failed!"
+echo "Looping forever. Install and use the debug-shell hook to debug this."
+echo "For more information, see <https://postmarketos.org/debug-shell>"
+loop_forever
diff --git a/main/postmarketos-initramfs/init_functions.sh b/main/postmarketos-initramfs/init_functions.sh
new file mode 100644
index 000000000..ee0b88069
--- /dev/null
+++ b/main/postmarketos-initramfs/init_functions.sh
@@ -0,0 +1,675 @@
+#!/bin/sh
+# This file will be in /init_functions.sh inside the initramfs.
+IP=172.16.42.1
+ROOT_PARTITION_UNLOCKED=0
+ROOT_PARTITION_RESIZED=0
+
+# Redirect stdout and stderr to logfile
+setup_log() {
+	# Bail out if PMOS_NO_OUTPUT_REDIRECT is set
+	echo "### postmarketOS initramfs ###"
+	grep -q PMOS_NO_OUTPUT_REDIRECT /proc/cmdline && return
+
+	# Print a message about what is going on to the normal output
+	echo "NOTE: All output from the initramfs gets redirected to:"
+	echo "/pmOS_init.log"
+	echo "If you want to disable this behavior (e.g. because you're"
+	echo "debugging over serial), please add this to your kernel"
+	echo "command line: PMOS_NO_OUTPUT_REDIRECT"
+
+	# Start redirect, print the first line again
+	exec >/pmOS_init.log 2>&1
+	echo "### postmarketOS initramfs ###"
+}
+
+mount_proc_sys_dev() {
+	# mdev
+	mount -t proc -o nodev,noexec,nosuid proc /proc || echo "Couldn't mount /proc"
+	mount -t sysfs -o nodev,noexec,nosuid sysfs /sys || echo "Couldn't mount /sys"
+
+	mkdir /config
+	mount -t configfs -o nodev,noexec,nosuid configfs /config
+
+	# /dev/pts (needed for telnet)
+	mkdir -p /dev/pts
+	mount -t devpts devpts /dev/pts
+
+	# /run (needed for cryptsetup)
+	mkdir /run
+}
+
+create_device_nodes() {
+	mknod -m 666 /dev/null c 1 3
+	mknod -m 644 /dev/random c 1 8
+	mknod -m 644 /dev/urandom c 1 9
+}
+
+setup_firmware_path() {
+	# Add the postmarketOS-specific path to the firmware search paths.
+	# This should be sufficient on kernel 3.10+, before that we need
+	# the kernel calling udev (and in our case /usr/lib/firmwareload.sh)
+	# to load the firmware for the kernel.
+	echo "Configuring kernel firmware image search path"
+	SYS=/sys/module/firmware_class/parameters/path
+	if ! [ -e "$SYS" ]; then
+		echo "Kernel does not support setting the firmware image search path. Skipping."
+		return
+	fi
+	# shellcheck disable=SC3037
+	echo -n /lib/firmware/postmarketos >$SYS
+}
+
+setup_mdev() {
+	# Start mdev daemon
+	mdev -d
+}
+
+setup_udev() {
+	# Use udev to coldplug all devices so that they can be used via libinput (e.g.
+	# by unl0kr). This is the same series of steps performed by the udev,
+	# udev-trigger and udev-settle RC services. See also:
+	# - https://git.alpinelinux.org/aports/tree/main/eudev/setup-udev
+	# - https://git.alpinelinux.org/aports/tree/main/udev-init-scripts/APKBUILD
+	if command -v udevd > /dev/null && command -v udevadm > /dev/null; then
+		udevd -d
+		udevadm trigger --type=devices --action=add
+		udevadm settle
+	fi
+}
+
+get_uptime_seconds() {
+	# Get the current system uptime in seconds - ignore the two decimal places.
+	awk -F '.' '{print $1}' /proc/uptime
+}
+
+setup_dynamic_partitions() {
+	command -v make-dynpart-mappings > /dev/null || return
+	attempt_start=$(get_uptime_seconds)
+	wait_seconds=10
+	slot_number=0
+	for super_partition in $1; do
+		# Wait for mdev
+		echo "Waiting for super partition $super_partition..."
+		while [ ! -b "$super_partition" ]; do
+			if [ "$(get_uptime_seconds)" -ge $(( attempt_start + wait_seconds )) ]; then
+				echo "ERROR: Super partition $super_partition failed to show up!"
+				return;
+			fi
+			sleep 0.1
+		done
+		make-dynpart-mappings "$super_partition" "$slot_number"
+		slot_number=$(( slot_number + 1 ))
+	done
+}
+
+mount_subpartitions() {
+	# Do not create subpartition mappings if pmOS_boot
+	# already exists (e.g. installed on an sdcard)
+	[ -n "$(find_boot_partition)" ] && return
+	attempt_start=$(get_uptime_seconds)
+	wait_seconds=10
+	echo "Trying to mount subpartitions for $wait_seconds seconds..."
+	while [ -z "$(find_boot_partition)" ]; do
+		partitions="$(grep -v "loop\|ram" < /proc/diskstats |\
+			sed 's/\(\s\+[0-9]\+\)\+\s\+//;s/ .*//;s/^/\/dev\//')"
+		echo "$partitions" | while read -r partition; do
+			case "$(kpartx -l "$partition" 2>/dev/null | wc -l)" in
+				2)
+					echo "Mount subpartitions of $partition"
+					kpartx -afs "$partition"
+					# Ensure that this was the *correct* subpartition
+					# Some devices have mmc partitions that appear to have
+					# subpartitions, but aren't our subpartition.
+					if [ -n "$(find_boot_partition)" ]; then
+						break
+					fi
+					kpartx -d "$partition"
+					continue
+					;;
+				*)
+					continue
+					;;
+			esac
+		done
+		if [ "$(get_uptime_seconds)" -ge $(( attempt_start + wait_seconds )) ]; then
+			echo "ERROR: failed to mount subpartitions!"
+			return;
+		fi
+		sleep 0.1;
+	done
+}
+
+find_root_partition() {
+	# The partition layout is one of the following:
+	# a) boot, root partitions on sdcard
+	# b) boot, root partition on the "system" partition (which has its
+	#    own partition header! so we have partitions on partitions!)
+	#
+	# mount_subpartitions() must get executed before calling
+	# find_root_partition(), so partitions from b) also get found.
+
+	# Short circuit all autodetection logic if pmos_root= or
+	# pmos_root_uuid= is supplied on the kernel cmdline
+	# shellcheck disable=SC2013
+	if [ "$ROOT_PARTITION_UNLOCKED" = 0 ]; then
+		for x in $(cat /proc/cmdline); do
+			[ "$x" = "${x#pmos_root_uuid=}" ] && continue
+			DEVICE="$(findfs UUID="${x#pmos_root_uuid=}")"
+		done
+
+		for x in $(cat /proc/cmdline); do
+			[ "$x" = "${x#pmos_root=}" ] && continue
+			DEVICE="${x#pmos_root=}"
+		done
+
+		# On-device installer: before postmarketOS is installed,
+		# we want to use the installer partition as root. It is the
+		# partition behind pmos_root. pmos_root will either point to
+		# reserved space, or to an unfinished installation.
+		# p1: boot
+		# p2: (reserved space) <--- pmos_root
+		# p3: pmOS_install
+		# Details: https://postmarketos.org/on-device-installer
+		if [ -n "$DEVICE" ]; then
+			next="$(echo "$DEVICE" | sed 's/2$/3/')"
+
+			# If the next partition is labeled pmOS_install (and
+			# not pmOS_deleteme), then postmarketOS is not
+			# installed yet.
+			if blkid | grep "$next" | grep -q pmOS_install; then
+				DEVICE="$next"
+			fi
+		fi
+	fi
+
+	# Try partitions in /dev/mapper and /dev/dm-* first
+	if [ -z "$DEVICE" ]; then
+		for id in pmOS_install pmOS_root crypto_LUKS; do
+			for path in /dev/mapper /dev/dm; do
+				DEVICE="$(blkid | grep "$path" | grep "$id" \
+					| cut -d ":" -f 1 | head -n 1)"
+				[ -z "$DEVICE" ] || break 2
+			done
+		done
+	fi
+
+	# Then try all devices
+	if [ -z "$DEVICE" ]; then
+		for id in pmOS_install pmOS_root crypto_LUKS; do
+			DEVICE="$(blkid | grep "$id" | cut -d ":" -f 1 \
+				| head -n 1)"
+			[ -z "$DEVICE" ] || break
+		done
+	fi
+	echo "$DEVICE"
+}
+
+find_boot_partition() {
+	# shellcheck disable=SC2013
+	for x in $(cat /proc/cmdline); do
+		[ "$x" = "${x#pmos_boot_uuid=}" ] && continue
+		findfs UUID="${x#pmos_boot_uuid=}"
+		return
+	done
+
+	# shellcheck disable=SC2013
+	for x in $(cat /proc/cmdline); do
+		[ "$x" = "${x#pmos_boot=}" ] && continue
+		echo "${x#pmos_boot=}"
+		return
+	done
+
+	# * "pmOS_i_boot" installer boot partition (fits 11 chars for fat32)
+	# * "pmOS_inst_boot" old installer boot partition (backwards compat)
+	# * "pmOS_boot" boot partition after installation
+	findfs LABEL="pmOS_i_boot" \
+		|| findfs LABEL="pmOS_inst_boot" \
+		|| findfs LABEL="pmOS_boot"
+}
+
+get_partition_type() {
+	partition="$1"
+	blkid "$partition" | sed 's/^.*TYPE="\([a-zA-z0-9_]*\)".*$/\1/'
+}
+
+# $1: path
+# $2: set to "rw" for read-write
+# Mount the boot partition. It gets mounted twice, first at /boot (ro), then at
+# /sysroot/boot (rw), after root has been mounted at /sysroot, so we can
+# switch_root to /sysroot and have the boot partition properly mounted.
+mount_boot_partition() {
+	partition=$(find_boot_partition)
+	if [ -z "$partition" ]; then
+		echo "ERROR: boot partition not found!"
+		show_splash "ERROR: Boot partition not found\\nhttps://postmarketos.org/troubleshooting"
+		loop_forever
+	fi
+
+	if [ "$2" = "rw" ]; then
+		mount_opts=""
+		echo "Mount boot partition ($partition) to $1 (read-write)"
+	else
+		mount_opts="-o ro"
+		echo "Mount boot partition ($partition) to $1 (read-only)"
+	fi
+
+	type="$(get_partition_type "$partition")"
+	case "$type" in
+		ext*)
+			echo "Detected ext filesystem"
+			modprobe ext4
+			# ext2 might be handled by the ext2 or ext4 kernel module
+			# so let mount detect that automatically by omitting -t
+			;;
+		vfat)
+			echo "Detected vfat filesystem"
+			modprobe vfat
+			mount_opts="-t vfat $mount_opts"
+			;;
+		*)	echo "WARNING: Detected unsupported '$type' filesystem ($partition)." ;;
+	esac
+
+	# shellcheck disable=SC2086
+	mount $mount_opts "$partition" "$1"
+}
+
+# $1: initramfs-extra path
+extract_initramfs_extra() {
+	initramfs_extra="$1"
+	if [ ! -e "$initramfs_extra" ]; then
+		echo "ERROR: initramfs-extra not found!"
+		show_splash "ERROR: initramfs-extra not found\\nhttps://postmarketos.org/troubleshooting"
+		loop_forever
+	fi
+	echo "Extract $initramfs_extra"
+	cpio -di < "$initramfs_extra"
+}
+
+wait_root_partition() {
+	while [ -z "$(find_root_partition)" ]; do
+		show_splash "ERROR: root partition not found\\nhttps://postmarketos.org/troubleshooting"
+		echo "Could not find the rootfs."
+		echo "Maybe you need to insert the sdcard, if your device has"
+		echo "any? Trying again in one second..."
+		sleep 1
+	done
+}
+
+delete_old_install_partition() {
+	# The on-device installer leaves a "pmOS_deleteme" (p3) partition after
+	# successful installation, located after "pmOS_root" (p2). Delete it,
+	# so we can use the space.
+	partition="$(find_root_partition | sed 's/2$/3/')"
+	if ! blkid "$partition" | grep -q pmOS_deleteme; then
+		return
+	fi
+
+	device="$(echo "$partition" | sed -E 's/p?3$//')"
+	echo "First boot after running on-device installer - deleting old" \
+		"install partition: $partition"
+	parted -s "$device" rm 3
+}
+
+# $1: path to device
+has_unallocated_space() {
+	# Check if there is unallocated space at the end of the device
+	parted -s "$1" print free | tail -n2 | \
+		head -n1 | grep -qi "free space"
+}
+
+resize_root_partition() {
+	partition=$(find_root_partition)
+
+	# Do not resize the installer partition
+	if blkid "$partition" | grep -q pmOS_install; then
+		echo "Resize root partition: skipped (on-device installer)"
+		return
+	fi
+
+	# Only resize the partition if it's inside the device-mapper, which means
+	# that the partition is stored as a subpartition inside another one.
+	# In this case we want to resize it to use all the unused space of the
+	# external partition.
+	if [ -z "${partition##"/dev/mapper/"*}" ]; then
+		# Get physical device
+		partition_dev=$(dmsetup deps -o blkdevname "$partition" | \
+			awk -F "[()]" '{print "/dev/"$2}')
+		if has_unallocated_space "$partition_dev"; then
+			echo "Resize root partition ($partition)"
+			# unmount subpartition, resize and remount it
+			kpartx -d "$partition"
+			parted -f -s "$partition_dev" resizepart 2 100%
+			kpartx -afs "$partition_dev"
+			ROOT_PARTITION_RESIZED=1
+		fi
+	fi
+
+	# Resize the root partition (non-subpartitions). Usually we do not want
+	# this, except for QEMU devices and non-android devices (e.g.
+	# PinePhone). For them, it is fine to use the whole storage device and
+	# so we pass PMOS_FORCE_PARTITION_RESIZE as kernel parameter.
+	if grep -q PMOS_FORCE_PARTITION_RESIZE /proc/cmdline; then
+		partition_dev="$(echo "$partition" | sed -E 's/p?2$//')"
+		if has_unallocated_space "$partition_dev"; then
+			echo "Resize root partition ($partition)"
+			parted -f -s "$partition_dev" resizepart 2 100%
+			partprobe
+			ROOT_PARTITION_RESIZED=1
+		fi
+	fi
+
+	# Resize the root partition (non-subpartitions) on Chrome OS devices.
+	# Match $deviceinfo_cgpt_kpart not being empty instead of cmdline
+	# because it does not make sense here as all these devices use the same
+	# partitioning methods. This also resizes third partition instead of
+	# second, because these devices have an additional kernel partition
+	# at the start.
+	if [ -n "$deviceinfo_cgpt_kpart" ]; then
+		partition_dev="$(echo "$partition" | sed -E 's/p?3$//')"
+		if has_unallocated_space "$partition_dev"; then
+			echo "Resize root partition ($partition)"
+			parted -f -s "$partition_dev" resizepart 3 100%
+			partprobe
+			ROOT_PARTITION_RESIZED=1
+		fi
+	fi
+}
+
+unlock_root_partition() {
+	partition="$(find_root_partition)"
+	if cryptsetup isLuks "$partition"; then
+		# Make sure the splash doesn't interfere
+		killall pbsplash 2>/dev/null
+		tried=0
+		until cryptsetup status root | grep -qwi active; do
+			fde-unlock "$partition" "$tried"
+			tried=$((tried + 1))
+		done
+		ROOT_PARTITION_UNLOCKED=1
+		# Show again the loading splashscreen
+		show_splash "Loading..."
+	fi
+}
+
+resize_root_filesystem() {
+	if [ "$ROOT_PARTITION_RESIZED" = 1 ]; then
+		show_splash "Resizing filesystem during initial boot..."
+		partition="$(find_root_partition)"
+		touch /etc/mtab # see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=673323
+		type="$(get_partition_type "$partition")"
+		case "$type" in
+			ext4)
+				echo "Resize 'ext4' root filesystem ($partition)"
+				modprobe ext4
+				resize2fs -f "$partition"
+				;;
+			f2fs)
+				echo "Resize 'f2fs' root filesystem ($partition)"
+				modprobe f2fs
+				resize.f2fs "$partition"
+				;;
+			btrfs)
+				echo "Resize 'btrfs' root filesystem ($partition)"
+				modprobe btrfs
+				resize_root_filesystem_tmp_btrfs="$(mktemp -d)"
+				mount -t btrfs "$partition" "$resize_root_filesystem_tmp_btrfs"
+				btrfs filesystem resize max "$resize_root_filesystem_tmp_btrfs"
+				umount "$resize_root_filesystem_tmp_btrfs"
+				unset resize_root_filesystem_tmp_btrfs
+				;;
+			*)	echo "WARNING: Can not resize '$type' filesystem ($partition)." ;;
+		esac
+		show_splash "Loading..."
+	fi
+}
+
+mount_root_partition() {
+	partition="$(find_root_partition)"
+	echo "Mount root partition ($partition) to /sysroot (read-only)"
+	type="$(get_partition_type "$partition")"
+	case "$type" in
+		ext4)
+			echo "Detected ext4 filesystem"
+			modprobe ext4
+			mount -t ext4 -o ro "$partition" /sysroot
+			;;
+		f2fs)
+			echo "Detected f2fs filesystem"
+			modprobe f2fs
+			mount -t f2fs -o ro "$partition" /sysroot
+			;;
+		btrfs)
+			echo "Detected btrfs filesystem"
+			modprobe btrfs
+			mount -t btrfs -o ro "$partition" /sysroot
+			;;
+		*)	echo "WARNING: Detected unsupported '$type' filesystem ($partition)." ;;
+	esac
+	if ! [ -e /sysroot/usr ]; then
+		echo "ERROR: unable to mount root partition!"
+		show_splash "ERROR: unable to mount root partition\\nhttps://postmarketos.org/troubleshooting"
+		loop_forever
+	fi
+}
+
+# $1: path to the hooks dir
+run_hooks() {
+	scriptsdir="$1"
+
+	if ! [ -d "$scriptsdir" ]; then
+		return
+	fi
+
+	for hook in "$scriptsdir"/*.sh; do
+		echo "Running initramfs hook: $hook"
+		sh "$hook"
+	done
+}
+
+setup_usb_network_android() {
+	# Only run, when we have the android usb driver
+	SYS=/sys/class/android_usb/android0
+	if ! [ -e "$SYS" ]; then
+		echo "  /sys/class/android_usb does not exist, skipping android_usb"
+		return
+	fi
+
+	echo "  Setting up an USB gadget through android_usb"
+
+	usb_idVendor="$(echo "${deviceinfo_usb_idVendor:-0x18D1}" | sed "s/0x//g")"	# default: Google Inc.
+	usb_idProduct="$(echo "${deviceinfo_usb_idProduct:-0xD001}" | sed "s/0x//g")"	# default: Nexus 4 (fastboot)
+
+	# Do the setup
+	echo "0" >"$SYS/enable"
+	echo "$usb_idVendor" >"$SYS/idVendor"
+	echo "$usb_idProduct" >"$SYS/idProduct"
+	echo "rndis" >"$SYS/functions"
+	echo "1" >"$SYS/enable"
+}
+
+setup_usb_network_configfs() {
+	# See: https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt
+	CONFIGFS=/config/usb_gadget
+
+	if ! [ -e "$CONFIGFS" ]; then
+		echo "  /config/usb_gadget does not exist, skipping configfs usb gadget"
+		return
+	fi
+
+	# Default values for USB-related deviceinfo variables
+	usb_idVendor="${deviceinfo_usb_idVendor:-0x18D1}"   # default: Google Inc.
+	usb_idProduct="${deviceinfo_usb_idProduct:-0xD001}" # default: Nexus 4 (fastboot)
+	usb_serialnumber="${deviceinfo_usb_serialnumber:-postmarketOS}"
+	usb_network_function="${deviceinfo_usb_network_function:-rndis.usb0}"
+
+	echo "  Setting up an USB gadget through configfs"
+	# Create an usb gadet configuration
+	mkdir $CONFIGFS/g1 || echo "  Couldn't create $CONFIGFS/g1"
+	echo "$usb_idVendor"  > "$CONFIGFS/g1/idVendor"
+	echo "$usb_idProduct" > "$CONFIGFS/g1/idProduct"
+
+	# Create english (0x409) strings
+	mkdir $CONFIGFS/g1/strings/0x409 || echo "  Couldn't create $CONFIGFS/g1/strings/0x409"
+
+	# shellcheck disable=SC2154
+	echo "$deviceinfo_manufacturer" > "$CONFIGFS/g1/strings/0x409/manufacturer"
+	echo "$usb_serialnumber"        > "$CONFIGFS/g1/strings/0x409/serialnumber"
+	# shellcheck disable=SC2154
+	echo "$deviceinfo_name"         > "$CONFIGFS/g1/strings/0x409/product"
+
+	# Create network function.
+	mkdir $CONFIGFS/g1/functions/"$usb_network_function" \
+		|| echo "  Couldn't create $CONFIGFS/g1/functions/$usb_network_function"
+
+	# Create configuration instance for the gadget
+	mkdir $CONFIGFS/g1/configs/c.1 \
+		|| echo "  Couldn't create $CONFIGFS/g1/configs/c.1"
+	mkdir $CONFIGFS/g1/configs/c.1/strings/0x409 \
+		|| echo "  Couldn't create $CONFIGFS/g1/configs/c.1/strings/0x409"
+	echo "USB network" > $CONFIGFS/g1/configs/c.1/strings/0x409/configuration \
+		|| echo "  Couldn't write configration name"
+
+	# Link the network instance to the configuration
+	ln -s $CONFIGFS/g1/functions/"$usb_network_function" $CONFIGFS/g1/configs/c.1 \
+		|| echo "  Couldn't symlink $usb_network_function"
+
+	# Check if there's an USB Device Controller
+	if [ -z "$(ls /sys/class/udc)" ]; then
+		echo "  No USB Device Controller available"
+		return
+	fi
+
+	# Link the gadget instance to an USB Device Controller. This activates the gadget.
+	# See also: https://github.com/postmarketOS/pmbootstrap/issues/338
+	# shellcheck disable=SC2005
+	echo "$(ls /sys/class/udc)" > $CONFIGFS/g1/UDC || echo "  Couldn't write UDC"
+}
+
+setup_usb_network() {
+	# Only run once
+	_marker="/tmp/_setup_usb_network"
+	[ -e "$_marker" ] && return
+	touch "$_marker"
+	echo "Setup usb network"
+	# Run all usb network setup functions (add more below!)
+	setup_usb_network_android
+	setup_usb_network_configfs
+}
+
+start_unudhcpd() {
+	# Only run once
+	[ "$(pidof unudhcpd)" ] && return
+
+	# Skip if disabled
+	# shellcheck disable=SC2154
+	if [ "$deviceinfo_disable_dhcpd" = "true" ]; then
+		echo "NOTE: start of dhcpd is disabled (deviceinfo_disable_dhcpd)"
+		return
+	fi
+
+	echo "Starting unudhcpd"
+	# Get usb interface
+	INTERFACE=""
+	ifconfig rndis0 "$IP" 2>/dev/null && INTERFACE=rndis0
+	if [ -z $INTERFACE ]; then
+		ifconfig usb0 "$IP" 2>/dev/null && INTERFACE=usb0
+	fi
+	if [ -z $INTERFACE ]; then
+		ifconfig eth0 "$IP" 2>/dev/null && INTERFACE=eth0
+	fi
+
+	if [ -z $INTERFACE ]; then
+		echo "  Could not find an interface to run a dhcp server on"
+		echo "  Interfaces:"
+		ip link
+		return
+	fi
+
+	echo "  Using interface $INTERFACE"
+	echo "  Starting the DHCP daemon"
+	(
+		unudhcpd -i "$INTERFACE" -s 172.16.42.1 -c 172.16.42.2
+	) &
+}
+
+# $1: Message to show
+show_splash() {
+	# Skip for non-framebuffer devices
+	# shellcheck disable=SC2154
+	if [ "$deviceinfo_no_framebuffer" = "true" ]; then
+		echo "NOTE: Skipping framebuffer splashscreen (deviceinfo_no_framebuffer)"
+		return
+	fi
+
+	# Disable splash
+	if grep -q PMOS_NOSPLASH /proc/cmdline; then
+		return
+	fi
+
+	killall pbsplash 2>/dev/null
+
+	while pgrep pbsplash >/dev/null; do
+		sleep 0.01
+	done
+
+	# shellcheck disable=SC2154
+	/usr/bin/pbsplash -s /usr/share/pbsplash/pmos-logo-text.svg -b "Linux $(uname -r) | $deviceinfo_codename" -m "$1 " &
+}
+
+set_framebuffer_mode() {
+	[ -e "/sys/class/graphics/fb0/modes" ] || return
+	[ -z "$(cat /sys/class/graphics/fb0/mode)" ] || return
+
+	_mode="$(cat /sys/class/graphics/fb0/modes)"
+	echo "Setting framebuffer mode to: $_mode"
+	echo "$_mode" > /sys/class/graphics/fb0/mode
+}
+
+setup_framebuffer() {
+	# Skip for non-framebuffer devices
+	# shellcheck disable=SC2154
+	if [ "$deviceinfo_no_framebuffer" = "true" ]; then
+		echo "NOTE: Skipping framebuffer setup (deviceinfo_no_framebuffer)"
+		return
+	fi
+
+	# Wait for /dev/fb0
+	echo "NOTE: Waiting 10 seconds for the framebuffer /dev/fb0."
+	echo "If your device does not have a framebuffer, disable this with:"
+	echo "no_framebuffer=true in <https://postmarketos.org/deviceinfo>"
+	for _ in $(seq 1 100); do
+		[ -e "/dev/fb0" ] && break
+		sleep 0.1
+	done
+	if ! [ -e "/dev/fb0" ]; then
+		echo "ERROR: /dev/fb0 did not appear!"
+		return
+	fi
+
+	set_framebuffer_mode
+}
+
+setup_bootchart2() {
+	if grep -q PMOS_BOOTCHART2 /proc/cmdline; then
+		if [ -f "/sysroot/sbin/bootchartd" ]; then
+			# shellcheck disable=SC2034
+			init="/sbin/bootchartd"
+			echo "remounting /sysroot as rw for /sbin/bootchartd"
+			mount -o remount, rw /sysroot
+
+			# /dev/null may not exist at the first boot after
+			# the root filesystem has been created.
+			[ -c /sysroot/dev/null ] && return
+			echo "creating /sysroot/dev/null for /sbin/bootchartd"
+			mknod -m 666 "/sysroot/dev/null" c 1 3
+		else
+			echo "WARNING: bootchart2 is not installed."
+		fi
+	fi
+}
+
+loop_forever() {
+	while true; do
+		sleep 1
+	done
+}