Initial commit

poky/meta/recipes-core/initrdscripts/initramfs-framework/debug

@@ -0,0 +1,82 @@
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+# Adds support to dynamic debugging of initramfs using bootparam in
+# following format:
+#   shell                 : starts a shell before and after each module
+#   shell=before:<module> : starts a shell before <module> is loaded and run
+#   shell=after:<module>  : starts a shell after <module> is loaded and run
+#
+#   shell-debug                 : run set -x as soon as possible
+#   shell-debug=before:<module> : run set -x before <module> is loaded and run
+#   shell-debug=after:<module>  : run set -x after <module> is loaded and run
+
+DEBUG_SHELL="false"
+
+debug_hook_handler() {
+	status=$1
+	module=$2
+
+	if [ -n "$bootparam_shell" ] && [ "$bootparam_shell" != "true" ]; then
+		shell_wanted_status=`expr $bootparam_shell : '\(.*\):.*'`
+		shell_wanted_module=`expr $bootparam_shell : '.*:\(.*\)'`
+
+		if [ "$shell_wanted_status" = "before" ]; then
+			shell_wanted_status=pre
+		else
+			shell_wanted_status=post
+		fi
+	fi
+
+	if [ "$bootparam_shell" = "true" ] ||
+		( [ "$status" = "$shell_wanted_status" ] &&
+			[ "$module" = "$shell_wanted_module" ] ); then
+		if [ "$status" = "pre" ]; then
+			status_msg="before"
+		else
+			status_msg="after"
+		fi
+
+		msg "Starting shell $status_msg $module..."
+		sh
+	fi
+
+	if [ -n "$bootparam_shell_debug" ] && [ "$bootparam_shell_debug" != "true" ]; then
+		shell_debug_wanted_status=`expr $bootparam_shell_debug : '\(.*\):.*'`
+		shell_debug_wanted_module=`expr $bootparam_shell_debug : '.*:\(.*\)'`
+
+		if [ "$shell_debug_wanted_status" = "before" ]; then
+			shell_debug_wanted_status=pre
+		else
+			shell_debug_wanted_status=post
+		fi
+	fi
+
+	if [ "$bootparam_shell_debug" = "true" ] ||
+		( [ "$status" = "$shell_debug_wanted_status" ] &&
+			[ "$module" = "$shell_debug_wanted_module" ] ); then
+		if [ "$DEBUG_SHELL" = "true" ]; then
+			return 0
+		fi
+
+		if [ "$status" = "pre" ]; then
+			status_msg="before"
+		else
+			status_msg="after"
+		fi
+
+		msg "Starting shell debugging $status_msg $module..."
+		DEBUG_SHELL="true"
+		set -x
+	fi
+}
+
+debug_enabled() {
+	return 0
+}
+
+debug_run() {
+	add_module_pre_hook "debug_hook_handler"
+	add_module_post_hook "debug_hook_handler"
+}

poky/meta/recipes-core/initrdscripts/initramfs-framework/e2fs

@@ -0,0 +1,28 @@
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+e2fs_enabled() {
+	return 0
+}
+
+e2fs_run() {
+	filesystems="ext4 ext3 ext2"
+
+	# load modules
+	for fs in $filesystems; do
+		load_kernel_module $fs
+	done
+
+	for fs in $filesystems; do
+		eval "fs_options=\$bootparam_${fs}"
+		if [ -n "$fs_options" ]; then
+		    dev=`expr "$fs_options" : '\([^:]*\).*'`
+		    path=`expr "$fs_options" : '[^:]*:\([^:]*\).*'`
+
+		    info "Mounting $dev as $fs on $path as $fs..."
+			mkdir -p $path
+		    mount -t $fs $dev $path
+		fi
+	done
+}

poky/meta/recipes-core/initrdscripts/initramfs-framework/exec

@@ -0,0 +1,29 @@
+#!/bin/sh
+# Copyright (C) 2017 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+EXEC_DIR=/exec.d  # place to look for modules
+
+exec_enabled() {
+	return 0
+}
+
+exec_run() {
+	if [ ! -d $EXEC_DIR ]; then
+		msg "No contents to exec in $EXEC_DIR. Starting shell ..."
+		sh
+	fi
+
+	# Load and run modules
+	for m in $EXEC_DIR/*; do
+		# Skip backup files
+		if [ "`echo $m | sed -e 's/\~$//'`" != "$m" ]; then
+			continue
+		fi
+
+		debug "Starting $m"
+
+		# process module
+		./$m
+	done
+}

poky/meta/recipes-core/initrdscripts/initramfs-framework/finish

@@ -0,0 +1,48 @@
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+finish_enabled() {
+	return 0
+}
+
+finish_run() {
+	if [ -n "$ROOTFS_DIR" ]; then
+		if [ ! -d $ROOTFS_DIR/dev ]; then
+			fatal "ERROR: There's no '/dev' on rootfs."
+		fi
+
+		# Unmount anything that was automounted by busybox via mdev-mount.sh.
+		# We're about to switch_root, and leaving anything mounted will prevent
+		# the next rootfs from modifying the block device.  Ignore ROOT_DISK,
+		# if it was set by setup-live, because it'll be mounted over loopback
+		# to ROOTFS_DIR.
+		local dev
+		for dev in /run/media/*; do
+			if mountpoint -q "${dev}" && [ "${dev##*/}" != "${ROOT_DISK}" ]; then
+				umount -f "${dev}" || debug "Failed to unmount ${dev}"
+			fi
+		done
+
+		info "Switching root to '$ROOTFS_DIR'..."
+
+		debug "Moving basic mounts onto rootfs"
+		for dir in `awk '/\/dev.* \/run\/media/{print $2}' /proc/mounts`; do
+			# Parse any OCT or HEX encoded chars such as spaces
+			# in the mount points to actual ASCII chars
+			dir=`printf $dir`
+			mkdir -p "${ROOTFS_DIR}/media/${dir##*/}"
+			mount -n --move "$dir" "${ROOTFS_DIR}/media/${dir##*/}"
+		done
+
+		debug "Moving /dev, /proc and /sys onto rootfs..."
+		mount --move /dev $ROOTFS_DIR/dev
+		mount --move /proc $ROOTFS_DIR/proc
+		mount --move /sys $ROOTFS_DIR/sys
+
+		cd $ROOTFS_DIR
+		exec switch_root -c /dev/console $ROOTFS_DIR ${bootparam_init:-/sbin/init}
+	else
+		debug "No rootfs has been set"
+	fi
+}

poky/meta/recipes-core/initrdscripts/initramfs-framework/init

@@ -0,0 +1,163 @@
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+#
+# Provides the API to be used by the initramfs modules
+#
+# Modules need to provide the following functions:
+#
+# <module>_enabled : check if the module ought to run (return 1 to skip)
+# <module>_run     : do what is need
+#
+# Boot parameters are available on environment in the as:
+#
+# 'foo=value' as 'bootparam_foo=value'
+# 'foo' as 'bootparam_foo=true'
+# 'foo.bar[=value] as 'foo_bar=[value|true]'
+
+# Register a function to be called before running a module
+# The hook is called as:
+#   <function> pre <module>
+add_module_pre_hook() {
+	MODULE_PRE_HOOKS="$MODULE_PRE_HOOKS $1"
+}
+
+# Register a function to be called after running a module
+# The hook is called as:
+#   <function> post <module>
+add_module_post_hook() {
+	MODULE_POST_HOOKS="$MODULE_POST_HOOKS $1"
+}
+
+# Load kernel module
+load_kernel_module() {
+	if modprobe $1 >/dev/null 2>&1; then
+		info "Loaded module $1"
+	else
+		debug "Failed to load module $1"
+	fi
+}
+
+# Prints information
+msg() {
+	echo "$@" >/dev/console
+}
+
+# Prints information if verbose bootparam is used
+info() {
+	[ -n "$bootparam_verbose" ] && echo "$@" >/dev/console
+}
+
+# Prints information if debug bootparam is used
+debug() {
+	[ -n "$bootparam_debug" ] && echo "DEBUG: $@" >/dev/console
+}
+
+# Prints a message and start a endless loop
+fatal() {
+    echo $1 >/dev/console
+    echo >/dev/console
+
+    if [ -n "$bootparam_init_fatal_sh" ]; then
+        sh
+    else
+	while [ "true" ]; do
+		sleep 3600
+	done
+    fi
+}
+
+# Variables shared amoung modules
+ROOTFS_DIR="/rootfs" # where to do the switch root
+MODULE_PRE_HOOKS=""  # functions to call before running each module
+MODULE_POST_HOOKS="" # functions to call after running each module
+MODULES_DIR=/init.d  # place to look for modules
+EFI_DIR=/sys/firmware/efi  # place to store device firmware information
+
+# make mount stop complaining about missing /etc/fstab
+touch /etc/fstab
+
+# initialize /proc, /sys, /run/lock and /var/lock
+mkdir -p /proc /sys /run/lock /var/lock
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+
+if [ -d $EFI_DIR ];then
+	mount -t efivarfs none /sys/firmware/efi/efivars
+fi
+
+# populate bootparam environment
+for p in `cat /proc/cmdline`; do
+	if [ -n "$quoted" ]; then
+		value="$value $p"
+		if [ "`echo $p | sed -e 's/\"$//'`" != "$p" ]; then
+			eval "bootparam_${quoted}=${value}"
+			unset quoted
+		fi
+		continue
+	fi
+
+	opt=`echo $p | cut -d'=' -f1`
+	opt=`echo $opt | sed -e 'y/.-/__/'`
+	if [ "`echo $p | cut -d'=' -f1`" = "$p" ]; then
+		eval "bootparam_${opt}=true"
+	else
+		value="`echo $p | cut -d'=' -f2-`"
+		if [ "`echo $value | sed -e 's/^\"//'`" != "$value" ]; then
+			quoted=${opt}
+			continue
+		fi
+		eval "bootparam_${opt}=\"${value}\""
+	fi
+done
+
+# use /dev with devtmpfs
+if grep -q devtmpfs /proc/filesystems; then
+	mkdir -p /dev
+	mount -t devtmpfs devtmpfs /dev
+else
+	if [ ! -d /dev ]; then
+		fatal "ERROR: /dev doesn't exist and kernel doesn't has devtmpfs enabled."
+	fi
+fi
+
+mkdir $ROOTFS_DIR
+
+# Load and run modules
+for m in $MODULES_DIR/*; do
+	# Skip backup files
+	if [ "`echo $m | sed -e 's/\~$//'`" != "$m" ]; then
+		continue
+	fi
+
+	module=`basename $m | cut -d'-' -f 2`
+	debug "Loading module $module"
+
+	# pre hooks
+	for h in $MODULE_PRE_HOOKS; do
+		debug "Calling module hook (pre): $h"
+		eval "$h pre $module"
+		debug "Finished module hook (pre): $h"
+	done
+
+	# process module
+	. $m
+
+	if ! eval "${module}_enabled"; then
+		debug "Skipping module $module"
+		continue
+	fi
+
+	debug "Running ${module}_run"
+	eval "${module}_run"
+
+	# post hooks
+	for h in $MODULE_POST_HOOKS; do
+		debug "Calling module hook (post): $h"
+		eval "$h post $module"
+		debug "Finished module hook (post): $h"
+	done
+done
+
+# Catch all
+fatal "ERROR: Initramfs failed to initialize the system."

poky/meta/recipes-core/initrdscripts/initramfs-framework/lvm

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+lvm_enabled() {
+	if ! lvscan |grep -i -w "inactive" &>/dev/null;then
+		return 1
+	fi
+	return 0
+}
+
+lvm_run() {
+	lvm pvscan --cache --activate ay
+	udevadm trigger --action=add
+}

poky/meta/recipes-core/initrdscripts/initramfs-framework/mdev

@@ -0,0 +1,30 @@
+#!/bin/sh
+# Copyright (C) 2011, 2017 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+mdev_enabled() {
+	if [ ! -e /sbin/mdev ]; then
+		debug "/sbin/mdev doesn't exist"
+		return 1
+	fi
+
+	return 0
+}
+
+mdev_run() {
+	# setup the environment
+	mount -t tmpfs tmpfs /dev
+
+	mkdir -m 1777 /dev/shm
+
+	mkdir -m 0755 /dev/pts
+	mount -t devpts devpts /dev/pts
+
+	echo /sbin/mdev > /proc/sys/kernel/hotplug
+	mdev -s
+
+	# load modules for devices
+	find /sys -name modalias | while read m; do
+		load_kernel_module $(cat "$m")
+	done
+}

poky/meta/recipes-core/initrdscripts/initramfs-framework/nfsrootfs

@@ -0,0 +1,48 @@
+#!/bin/sh
+
+nfsrootfs_enabled() {
+	if [ ${bootparam_root} != "/dev/nfs" ] || [ -z ${bootparam_nfsroot} ]; then
+		return 1
+	fi
+	return 0
+}
+
+nfsrootfs_run() {
+	local nfs_opts
+	local location
+	local flags
+	local server_ip
+
+	nfs_opts=""
+	if [ "${bootparam_nfsroot#*,}" != "${bootparam_nfsroot}" ]; then
+		nfs_opts="-o ${bootparam_nfsroot#*,}"
+	fi
+
+	location="${bootparam_nfsroot%%,*}"
+	if [ "${location#*:}" = "${location}" ]; then
+		# server-ip not given. Get server ip from ip option
+		server_ip=""
+		if [ "${bootparam_ip#*:}" != "${bootparam_ip}" ]; then
+			server_ip=$(echo "$bootparam_ip" | cut -d: -f2)
+		fi
+
+		if [ -z "$server_ip" ]; then
+			fatal "Server IP is not set. Update ip or nfsroot options."
+		fi
+		location=${server_ip}:${location}
+	fi
+
+	flags="-o nolock"
+	if [ -n "$bootparam_ro" ] && ! echo "$bootparam_rootflags" | grep -w -q "ro"; then
+		if [  -n "$bootparam_rootflags" ]; then
+			bootparam_rootflags="$bootparam_rootflags,"
+		fi
+		bootparam_rootflags="${bootparam_rootflags}ro"
+	fi
+	if [ -n "$bootparam_rootflags" ]; then
+		flags="$flags -o $bootparam_rootflags"
+	fi
+
+	mount -t nfs ${flags} ${nfs_opts} ${location} ${ROOTFS_DIR}
+}
+

poky/meta/recipes-core/initrdscripts/initramfs-framework/overlayroot

@@ -0,0 +1,112 @@
+#!/bin/sh
+
+# SPDX-License-Identifier: MIT
+#
+# Copyright 2022 (C), Microsoft Corporation
+
+# Simple initramfs module intended to mount a read-write (RW)
+# overlayfs on top of /, keeping the original root filesystem
+# as read-only (RO), free from modifications by the user.
+#
+# NOTE: The read-only IMAGE_FEATURE is not required for this to work
+#
+# This script is based on the overlay-etc.bbclass, which sets up
+# an overlay on top of the /etc directory, but in this case allows
+# accessing the original, unmodified rootfs at /rofs after boot.
+#
+# It relies on the initramfs-module-rootfs to mount the original
+# root filesystem, and requires 'rootrw=<foo>' to be passed as a
+# kernel parameter, specifying the device/partition intended to
+# use as RW.
+#
+# This module needs to be executed after the initramfs-module-rootfs
+# since it relies on it to mount the filesystem at initramfs startup
+# but before the finish module which normally switches root.
+# After overlayroot is executed the usual boot flow continues from
+# the real init process.
+#
+# If something goes wrong while running this module, the rootfs
+# is still mounted RO (with no overlay) and the finish module is
+# executed to continue booting normally.
+#
+# It also has a dependency on overlayfs being enabled in the
+# running kernel via KERNEL_FEATURES (kmeta) or any other means.
+
+
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+
+# We get OLDROOT from the rootfs module
+OLDROOT="/rootfs"
+
+NEWROOT="${RWMOUNT}/root"
+RWMOUNT="/overlay"
+ROMOUNT="${RWMOUNT}/rofs"
+UPPER_DIR="${RWMOUNT}/upper"
+WORK_DIR="${RWMOUNT}/work"
+
+MODULES_DIR=/init.d
+
+# Something went wrong, make sure / is mounted as read only anyway.
+exit_gracefully() {
+    echo $1 >/dev/console
+    echo >/dev/console
+    echo "OverlayRoot mounting failed, starting system as read-only" >/dev/console
+    echo >/dev/console
+
+    # The following is borrowed from rootfs-postcommands.bbclass
+    # This basically looks at the real rootfs mounting options and
+    # replaces them with "ro"
+
+    # Tweak the mount option and fs_passno for rootfs in fstab
+    if [ -f ${OLDROOT}/etc/fstab ]; then
+        sed -i -e '/^[#[:space:]]*\/dev\/root/{s/defaults/ro/;s/\([[:space:]]*[[:digit:]]\)\([[:space:]]*\)[[:digit:]]$/\1\20/}' ${OLDROOT}/etc/fstab
+    fi
+
+    # Tweak the "mount -o remount,rw /" command in busybox-inittab inittab
+    if [ -f ${OLDROOT}/etc/inittab ]; then
+        sed -i 's|/bin/mount -o remount,rw /|/bin/mount -o remount,ro /|' ${OLDROOT}/etc/inittab
+    fi
+
+    # Continue as if the overlayroot module didn't exist to continue booting
+    . $MODULES_DIR/99-finish
+    eval "finish_run"
+}
+
+
+if [ -z "$bootparam_rootrw" ]; then
+    exit_gracefully "rootrw= kernel parameter doesn't exist and its required to mount the overlayfs"
+fi
+
+mkdir -p ${RWMOUNT}
+
+# Mount RW device
+if mount -n -t ${bootparam_rootfstype:-ext4} -o ${bootparam_rootflags:-defaults} ${bootparam_rootrw} ${RWMOUNT}
+then
+    # Set up overlay directories
+    mkdir -p ${UPPER_DIR}
+    mkdir -p ${WORK_DIR}
+    mkdir -p ${NEWROOT}
+    mkdir -p ${ROMOUNT}
+
+    # Remount OLDROOT as read-only
+    mount -o bind ${OLDROOT} ${ROMOUNT}
+    mount -o remount,ro ${ROMOUNT}
+
+    # Mount RW overlay
+    mount -t overlay overlay -o lowerdir=${ROMOUNT},upperdir=${UPPER_DIR},workdir=${WORK_DIR} ${NEWROOT} || exit_gracefully "initramfs-overlayroot: Mounting overlay failed"
+else
+    exit_gracefully "initramfs-overlayroot: Mounting RW device failed"
+fi
+
+# Set up filesystems on overlay
+mkdir -p ${NEWROOT}/proc
+mkdir -p ${NEWROOT}/dev
+mkdir -p ${NEWROOT}/sys
+mkdir -p ${NEWROOT}/rofs
+
+mount -n --move ${ROMOUNT} ${NEWROOT}/rofs
+mount -n --move /proc ${NEWROOT}/proc
+mount -n --move /sys ${NEWROOT}/sys
+mount -n --move /dev ${NEWROOT}/dev
+
+exec chroot ${NEWROOT}/ ${bootparam_init:-/sbin/init} || exit_gracefully "Couldn't chroot into overlay"

poky/meta/recipes-core/initrdscripts/initramfs-framework/rootfs

@@ -0,0 +1,66 @@
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+rootfs_enabled() {
+	return 0
+}
+
+rootfs_run() {
+        if [ -z "$ROOTFS_DIR" ]; then
+		return
+        fi
+	C=0
+	delay=${bootparam_rootdelay:-1}
+	timeout=${bootparam_roottimeout:-5}
+	while ! mountpoint -q $ROOTFS_DIR; do
+		if [ $(( $C * $delay )) -gt $timeout ]; then
+			fatal "root '$bootparam_root' doesn't exist or does not contain a /dev."
+		fi
+
+		if [ -n "$bootparam_root" ]; then
+			debug "No e2fs compatible filesystem has been mounted, mounting $bootparam_root..."
+
+			if [ "`echo ${bootparam_root} | cut -c1-5`" = "UUID=" ]; then
+				root_uuid=`echo $bootparam_root | cut -c6-`
+				bootparam_root="/dev/disk/by-uuid/$root_uuid"
+			elif [ "`echo ${bootparam_root} | cut -c1-9`" = "PARTUUID=" ]; then
+				root_partuuid=`echo $bootparam_root | cut -c10-`
+				bootparam_root="/dev/disk/by-partuuid/$root_partuuid"
+			elif [ "`echo ${bootparam_root} | cut -c1-10`" = "PARTLABEL=" ]; then
+				root_partlabel=`echo $bootparam_root | cut -c11-`
+				bootparam_root="/dev/disk/by-partlabel/$root_partlabel"
+			elif [ "`echo ${bootparam_root} | cut -c1-6`" = "LABEL=" ]; then
+				root_label=`echo $bootparam_root | cut -c7-`
+				bootparam_root="/dev/disk/by-label/$root_label"
+			fi
+
+			if [ -e "$bootparam_root" ]; then
+				flags=""
+				if [ -n "$bootparam_ro" ] && ! echo "$bootparam_rootflags" | grep -w -q "ro"; then
+					if [  -n "$bootparam_rootflags" ]; then
+						bootparam_rootflags="$bootparam_rootflags,"
+					fi
+					bootparam_rootflags="${bootparam_rootflags}ro"
+				fi
+				if [ -n "$bootparam_rootflags" ]; then
+					flags="$flags -o$bootparam_rootflags"
+				fi
+				if [ -n "$bootparam_rootfstype" ]; then
+					flags="$flags -t$bootparam_rootfstype"
+				fi
+				mount $flags $bootparam_root $ROOTFS_DIR
+				if mountpoint -q $ROOTFS_DIR; then
+					break
+				else
+					# It is unlikely to change, but keep trying anyway.
+					# Perhaps we pick a different device next time.
+					umount $ROOTFS_DIR
+				fi
+			fi
+		fi
+		debug "Sleeping for $delay second(s) to wait root to settle..."
+		sleep $delay
+		C=$(( $C + 1 ))
+	done
+}

poky/meta/recipes-core/initrdscripts/initramfs-framework/setup-live

@@ -0,0 +1,64 @@
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+setup_enabled() {
+	return 0
+}
+
+setup_run() {
+ROOT_IMAGE="rootfs.img"
+ISOLINUX=""
+ROOT_DISK=""
+shelltimeout=30
+
+	if [ -z "$bootparam_root" -o "$bootparam_root" = "/dev/ram0" ]; then
+		echo "Waiting for removable media..."
+		C=0
+		while true
+		do
+		  for i in `ls /run/media 2>/dev/null`; do
+		      if [ -f /run/media/$i/$ROOT_IMAGE ] ; then
+				found="yes"
+				ROOT_DISK="$i"
+				break
+			  elif [ -f /run/media/$i/isolinux/$ROOT_IMAGE ]; then
+				found="yes"
+				ISOLINUX="isolinux"
+				ROOT_DISK="$i"
+				break
+		      fi
+		  done
+		  if [ "$found" = "yes" ]; then
+		      break;
+		  fi
+		  # don't wait for more than $shelltimeout seconds, if it's set
+		  if [ -n "$shelltimeout" ]; then
+		      echo -n " " $(( $shelltimeout - $C ))
+		      if [ $C -ge $shelltimeout ]; then
+		           echo "..."
+			   echo "Mounted filesystems"
+		           mount | grep media
+		           echo "Available block devices"
+		           cat /proc/partitions
+		           fatal "Cannot find $ROOT_IMAGE file in /run/media/* , dropping to a shell "
+		      fi
+		      C=$(( C + 1 ))
+		  fi
+		  sleep 1
+		done
+		# The existing rootfs module has no support for rootfs images. Assign the rootfs image.
+		bootparam_root="/run/media/$ROOT_DISK/$ISOLINUX/$ROOT_IMAGE"
+	fi
+
+	if [ "$bootparam_LABEL" != "boot" -a -f /init.d/$bootparam_LABEL.sh ] ; then
+		if [ -f /run/media/$i/$ISOLINUX/$ROOT_IMAGE ] ; then
+		    ./init.d/$bootparam_LABEL.sh $i/$ISOLINUX $ROOT_IMAGE $video_mode $vga_mode $console_params
+		else
+		    fatal "Could not find $bootparam_LABEL script"
+		fi
+
+		# If we're getting here, we failed...
+		fatal "Target $bootparam_LABEL failed"
+	fi
+}

poky/meta/recipes-core/initrdscripts/initramfs-framework/udev

@@ -0,0 +1,50 @@
+#!/bin/sh
+# Copyright (C) 2011, 2012 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+udev_shutdown_hook_handler() {
+	status=$1
+	module=$2
+	if [ "$status" = "pre" ] && [ "$module" = "finish" ]; then
+		udevadm settle
+		killall `basename $_UDEV_DAEMON` 2>/dev/null
+	fi
+}
+
+udev_daemon() {
+	OPTIONS="/sbin/udev/udevd /sbin/udevd /lib/udev/udevd /lib/systemd/systemd-udevd"
+
+	for o in $OPTIONS; do
+		if [ -x "$o" ]; then
+			echo $o
+			return 0
+		fi
+	done
+
+	return 1
+}
+
+_UDEV_DAEMON=`udev_daemon`
+
+udev_enabled() {
+	if [ -z "$_UDEV_DAEMON" ]; then
+		msg "WARNING: Cannot find the udev daemon; daemon will not be started in initramfs."
+		return 1
+	fi
+
+	return 0
+}
+
+udev_run() {
+	add_module_pre_hook "udev_shutdown_hook_handler"
+
+	mkdir -p /run
+	mkdir -p /var/run
+
+	# Workaround if console=null, systemd-udevd needs valid stdin, stdout and stderr to work
+	sh -c "exec 4< /dev/console" || { exec 0> /dev/null; exec 1> /dev/null; exec 2> /dev/null; }
+
+	$_UDEV_DAEMON --daemon
+	udevadm trigger --action=add
+	udevadm settle
+}