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#!/bin/sh
MODULE_DIR=/initrd.d
BOOT_ROOT=
ROOT_DEVICE=
early_setup() {
mkdir -p /proc /sys /mnt /tmp
mount -t proc proc /proc
mount -t sysfs sysfs /sys
modprobe -q mtdblock
}
dev_setup()
{
echo -n "initramfs: 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 $minor
fi
done
echo
}
read_args() {
[ -z "$CMDLINE" ] && CMDLINE=`cat /proc/cmdline`
for arg in $CMDLINE; do
optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
case $arg in
root=*)
ROOT_DEVICE=$optarg ;;
rootfstype=*)
ROOT_FSTYPE=$optarg ;;
rootdelay=*)
rootdelay=$optarg ;;
debug) set -x ;;
shell) sh ;;
esac
done
}
do_depmod() {
[ -e "/lib/modules/$(uname -r)/modules.dep" ] || depmod
}
load_module() {
# Cannot redir to $CONSOLE here easily - may not be set yet
echo "initramfs: Loading $module module"
source $1
}
load_modules() {
for module in $MODULE_DIR/$1; do
[ -e "$module" ] && load_module $module
done
}
boot_root() {
cd $BOOT_ROOT
exec switch_root -c /dev/console $BOOT_ROOT /sbin/init
}
fatal() {
echo $1 >$CONSOLE
echo >$CONSOLE
exec sh
}
echo "Starting initramfs boot..."
early_setup
load_modules '0*'
do_depmod
[ -z "$CONSOLE" ] && CONSOLE="/dev/console"
read_args
if [ -z "$rootdelay" ]; then
echo "rootdelay parameter was not passed on kernel command line - assuming 2s delay"
echo "If you would like to avoid this delay, pass explicit rootdelay=0"
rootdelay="2"
fi
if [ -n "$rootdelay" ]; then
echo "Waiting $rootdelay seconds for devices to settle..." >$CONSOLE
sleep $rootdelay
fi
dev_setup
load_modules '[1-9]*'
[ -n "$BOOT_ROOT" ] && boot_root
fatal "No valid root device was specified. Please add root=/dev/something to the kernel command-line and try again."
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