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authorAlex Osborne <ato@meshy.org>2007-07-19 20:55:15 +0000
committerPaul Sokolovsky <pmiscml@gmail.com>2007-07-19 20:55:15 +0000
commit2603e7f62a5a9e902a554855ed601d0619817b71 (patch)
tree3db9dd94483efff12cfd3f64cd9c571e8f260882
parent86a52172905ecd9d850cf62f6042b820a3192230 (diff)
initramfs: New modular initramfs for booting kernel from various media.
* Design principles: * This initramfs just mounts roots and runs init on it, nothing else. * Whenever possible, existing kernel parameters are used. When extended boot methods are provided, new parameters mimick/adhere to existing conventions. * System is modular/pluggable - each mount method is in own module with more or less well defined interface, it's possible to construct complete system with any combination of modules. * Modules includes: initramfs-module-loop, initramfs-module-nfs, to boot from loop devices (including recursive loops) and NFS, correspondingly.
-rw-r--r--packages/initrdscripts/files/init.sh65
-rw-r--r--packages/initrdscripts/files/loopboot.sh54
-rw-r--r--packages/initrdscripts/files/nfsboot.sh74
-rw-r--r--packages/initrdscripts/initramfs-module-loop_0.1.bb8
-rw-r--r--packages/initrdscripts/initramfs-module-nfs_0.1.bb8
-rw-r--r--packages/initrdscripts/initramfs_0.1.bb8
6 files changed, 174 insertions, 43 deletions
diff --git a/packages/initrdscripts/files/init.sh b/packages/initrdscripts/files/init.sh
new file mode 100644
index 0000000000..8c9803f21b
--- /dev/null
+++ b/packages/initrdscripts/files/init.sh
@@ -0,0 +1,65 @@
+#!/bin/sh
+
+MODULE_DIR=/initrd.d
+BOOT_ROOT=
+ROOT_DEVICE=/dev/null
+
+early_setup() {
+ mkdir /proc
+ mount -t proc proc /proc
+ mkdir /mnt
+
+ echo -n "creating device nodes: "
+ grep '^ *[0-9]' /proc/partitions | while read major minor blocks dev
+ do
+ if [ ! -e /dev/$dev ]; then
+ echo -n "$dev "
+ [ -e /dev/$dev ] || mknod /dev/$dev b $major $minor
+ fi
+ done
+ echo
+}
+
+read_args() {
+ CMDLINE=`cat /proc/cmdline`
+ for arg in $CMDLINE; do
+ optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
+ case $arg in
+ root=*)
+ ROOT_DEVICE=$optarg ;;
+ rootdelay=*)
+ rootdelay=$optarg ;;
+ esac
+ done
+}
+
+load_modules() {
+ for module in $MODULE_DIR/*; do
+ source $module
+ done
+}
+
+boot_root() {
+ cd $BOOT_ROOT
+ exec switch_root -c /dev/console $BOOT_ROOT /sbin/init
+}
+
+boot_failed() {
+ echo "No valid root device was specified. Please add root=/dev/something to"
+ echo "the kernel command-line and try again."
+ echo
+ exec sh
+}
+
+echo "Starting initramfs boot..."
+early_setup
+read_args
+
+if [ -n "$rootdelay" ]; then
+ echo "Waiting $rootdelay seconds for devices to settle..."
+ sleep $rootdelay
+fi
+
+load_modules
+[ -n "$BOOT_ROOT" ] && boot_root
+boot_failed
diff --git a/packages/initrdscripts/files/loopboot.sh b/packages/initrdscripts/files/loopboot.sh
new file mode 100644
index 0000000000..55a1948db8
--- /dev/null
+++ b/packages/initrdscripts/files/loopboot.sh
@@ -0,0 +1,54 @@
+#!/bin/sh
+
+if [ "$ROOT_DEVICE" = "/dev/loop" ]; then
+ loop_mount() {
+ loopdev=/dev/loop$loop_num
+ mountpt=/mnt/loop$loop_num
+
+ [ -e $loopdev ] || mknod $loopdev b 7 $loop_num
+
+ # if only one argument was specified, let it be path not dev
+ if [ -z "$path" ] && [ -n "$dev" ]; then
+ path="$dev"
+ dev=""
+ fi
+ [ -z "$offset" ] && offset=0
+
+ if [ -n "$dev" ]; then
+ hostpt=`expr "$dev" : '.*/\([^/]*\)'`
+ [ -z "$hostpt" ] && hostpt="$dev"
+
+ echo "Mounting $dev on $hostpt"
+ mkdir $hostpt
+ mount $dev $hostpt
+ cd $hostpt
+ fi
+
+ echo "Loopback setup of $path (offset $offset)"
+ losetup -o "$offset" "$loopdev" "$path"
+
+ echo "Mounting $loopdev on $mountpt"
+ mkdir "$mountpt"
+ mount "$loopdev" "$mountpt"
+ cd "$mountpt"
+ BOOT_ROOT="$mountpt"
+ loop_num=`expr "$loop_num" + 1`
+ }
+
+ modprobe vfat
+ modprobe loop
+
+ loop_num=0
+
+ for arg in $CMDLINE; do
+ optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
+ echo $arg xxx $optarg
+ case $arg in
+ looproot=*)
+ dev=`expr "$optarg" : '\([^:]*\).*'`
+ path=`expr "$optarg" : '[^:]*:\([^:]*\).*'`
+ offset=`expr "$optarg" : '[^:]*:[^:]*:\([^:]*\).*'`
+ loop_mount ;;
+ esac
+ done
+fi
diff --git a/packages/initrdscripts/files/nfsboot.sh b/packages/initrdscripts/files/nfsboot.sh
index b536c4042b..62a044267a 100644
--- a/packages/initrdscripts/files/nfsboot.sh
+++ b/packages/initrdscripts/files/nfsboot.sh
@@ -1,50 +1,38 @@
#!/bin/sh
-echo "Starting initramfs boot..."
-mkdir /proc
-mount -t proc proc /proc
-
-for arg in `cat /proc/cmdline`; do
- echo $arg
- optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
- echo $optarg
- case $arg in
- root=*)
- root=$optarg ;;
- nfsroot=*)
- nfsroot=$optarg ;;
- ip=*)
- ip=$optarg ;;
+if [ "$ROOT_DEVICE" = "/dev/nfs" ]; then
+ for arg in $CMDLINE; do
+ echo $arg
+ optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
+ echo $optarg
+ case $arg in
+ nfsroot=*)
+ nfsroot=$optarg ;;
+ ip=*)
+ ip=$optarg ;;
+ esac
+ done
+
+ echo $ip | (IFS=: read client_ip server_ip gw_ip netmask hostname device autoconf; \
+ echo client_ip=$client_ip;
+ echo server_ip=$server_ip;
+ echo gw_ip=$gw_ip;
+ echo netmask=$netmask;
+ echo hostname=$hostname;
+ echo device=$device;
+ echo autoconf=$autoconf;
+
+ case "$device" in
+ usb*)
+ echo "USB"
+ modprobe g_ether
+ ;;
esac
-done
-
-echo $ip | (IFS=: read client_ip server_ip gw_ip netmask hostname device autoconf; \
-echo client_ip=$client_ip;
-echo server_ip=$server_ip;
-echo gw_ip=$gw_ip;
-echo netmask=$netmask;
-echo hostname=$hostname;
-echo device=$device;
-echo autoconf=$autoconf;
-
-case "x$device" in
- usb*)
- echo "USB"
- modprobe g_ether
- ;;
-esac
+
+ ifconfig $device $client_ip
+ )
-ifconfig $device $client_ip
-)
-
-mkdir /mnt
-if [ "x$root" = "x/dev/nfs" ]; then
echo "booting from NFS: $nfsroot"
mount -t nfs $nfsroot /mnt
-else
- echo "booting from: $root"
- mount $root /mnt
+ BOOT_ROOT=/mnt
fi
-
-cd /mnt
-exec switch_root -c /dev/console /mnt /sbin/init
diff --git a/packages/initrdscripts/initramfs-module-loop_0.1.bb b/packages/initrdscripts/initramfs-module-loop_0.1.bb
new file mode 100644
index 0000000000..ce8f368c5a
--- /dev/null
+++ b/packages/initrdscripts/initramfs-module-loop_0.1.bb
@@ -0,0 +1,8 @@
+SRC_URI = "file://loopboot.sh"
+PR = "r0"
+
+do_install() {
+ install -m 0755 ${WORKDIR}/loopboot.sh ${D}/initrd.d/loop
+}
+
+FILES_${PN} += " /initrd.d/loop "
diff --git a/packages/initrdscripts/initramfs-module-nfs_0.1.bb b/packages/initrdscripts/initramfs-module-nfs_0.1.bb
new file mode 100644
index 0000000000..90b80a31b1
--- /dev/null
+++ b/packages/initrdscripts/initramfs-module-nfs_0.1.bb
@@ -0,0 +1,8 @@
+SRC_URI = "file://nfsboot.sh"
+PR = "r0"
+
+do_install() {
+ install -m 0755 ${WORKDIR}/nfsboot.sh ${D}/initrd.d/nfs
+}
+
+FILES_${PN} += " /initrd.d/nfs "
diff --git a/packages/initrdscripts/initramfs_0.1.bb b/packages/initrdscripts/initramfs_0.1.bb
new file mode 100644
index 0000000000..c7e44eae22
--- /dev/null
+++ b/packages/initrdscripts/initramfs_0.1.bb
@@ -0,0 +1,8 @@
+SRC_URI = "file://init.sh"
+PR = "r0"
+
+do_install() {
+ install -m 0755 ${WORKDIR}/init.sh ${D}/init
+}
+
+FILES_${PN} += " /init "