cat populate_rfs.sh

#!/bin/bash

if [ $# -ne 1 ]
then
    echo "Usage: $0 <root file system path>"
    exit 1
fi

if [ ! -d "$1" ]
then
    echo "$1 is not a directory"
    exit 2
fi

cd "$1"

mkdir -p dev/pts
mknod dev/console c 5 1 2> /dev/null
mkdir -p etc/init.d
mkdir -p lib/modules/3.12.9 # For rmmod to work
mkdir -p proc
mkdir -p sys
mkdir -p root
mkdir -p tmp
mkdir -p var/log
mkdir -p boot
mkdir -p mmc # mmc mount point

cat << CONTENT > etc/fstab
proc    /proc    proc    defaults    0    0
none    /dev/pts    devpts    mode=0622    0    0
CONTENT

cat << CONTENT > etc/inittab
::sysinit:/etc/init.d/rcS

# /bin/ash
#
# Start an "askfirst" shell on the serial port
console::askfirst:-/bin/ash

# Stuff to do when restarting the init process
::restart:/sbin/init

# Stuff to do before rebooting
::ctrlaltdel:/sbin/reboot
::shutdown:/bin/umount -a -r
::shutdown:/sbin/swapoff -a
CONTENT

cat << "CONTENT" > etc/init.d/rcS
#!/bin/sh
#   ---------------------------------------------
#   Common settings
#   ---------------------------------------------
HOSTNAME=OMAP3EVM
VERSION=1.0.0

hostname $HOSTNAME

#   ---------------------------------------------
#   Prints execution status.
#
#   arg1 : Execution status
#   arg2 : Continue (0) or Abort (1) on error
#   ---------------------------------------------
status ()
{
       if [ $1 -eq 0 ] ; then
               echo "[SUCCESS]"
       else
               echo "[FAILED]"

               if [ $2 -eq 1 ] ; then
                       echo "... System init aborted."
                       exit 1
               fi
       fi

}

#   ---------------------------------------------
#   Get verbose
#   ---------------------------------------------
echo ""
echo "    System initialization..."
echo ""
echo "    Hostname       : $HOSTNAME"
echo "    Filesystem     : v$VERSION"
echo ""
echo ""
echo "    Kernel release : `uname -s` `uname -r`"
echo "    Kernel version : `uname -v`"
echo ""


#   ---------------------------------------------
#   MDEV Support
#   (Requires sysfs support in the kernel)
#   ---------------------------------------------
echo -n " Mounting /proc             : "
mount -n -t proc proc /proc
status $? 1

echo -n " Mounting /sys              : "
mount -n -t sysfs sysfs /sys
status $? 1

echo -n " Mounting /dev              : "
mount -n -t tmpfs mdev /dev
status $? 1

echo -n " Mounting /dev/pts          : "
mkdir /dev/pts
mount -t devpts devpts /dev/pts
status $? 1

echo -n " Enabling hot-plug          : "
echo "/sbin/mdev" > /proc/sys/kernel/hotplug
status $? 0

echo -n " Populating /dev            : "
mkdir /dev/input
mkdir /dev/snd

mdev -s
status $? 0

#   ---------------------------------------------
#   Disable power management
#   (Requires sysfs support in the kernel)
#   ---------------------------------------------
# echo -n " Disabling Power mgmt       : "
# echo -n "1" > /sys/power/cpuidle_deepest_state
# status $? 1

#   ---------------------------------------------
#   Turn off LCD after 1 hour of inactivity
#   (Requires sysfs support in the kernel)
#   ---------------------------------------------
# echo -n " Turn off LCD after 1 hour  : "
# echo -n "3600" > /sys/power/fb_timeout_value
# status $? 1

#   ---------------------------------------------
#   Mount the default file systems
#   ---------------------------------------------
echo -n " Mounting other filesystems : "
mount -a
status $? 0

#   ---------------------------------------------
#   Set PATH
#   ---------------------------------------------
export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin

#   ---------------------------------------------
#   Start other daemons
#   ---------------------------------------------
echo -n " Starting syslogd           : "
/sbin/syslogd
status $? 0

echo -n " Starting telnetd           : "
/usr/sbin/telnetd
status $? 0

#   ---------------------------------------------
#   Done!
#   ---------------------------------------------
echo ""
echo "System initialization complete."

#   ---------------------------------------------
#   Start demo app
#   ---------------------------------------------
#if [[ -x /etc/init.d/demo_start ]]; then
#       echo " Starting Demo Application..."
#       /etc/init.d/demo_start &
#       sleep 5
#fi
CONTENT
chmod +x etc/init.d/rcS

cat << "CONTENT" > etc/mdev.conf
audio       0:5 0666
console     0:5 0600
control.*   0:0 0660 @/bin/mv /dev/$MDEV /dev/snd/
dsp         0:5 0666
event.*     0:0 0600 @/bin/mv /dev/$MDEV /dev/input/
fb          0:5 0666
nfs         0:5 0770
null        0:0 0777
pcm.*       0:0 0660 @/bin/mv /dev/$MDEV /dev/snd/
rtc         0:0 0666
tty         0:5 0660
tty0*       0:5 0660
tty1*       0:5 0660
tty2*       0:5 0660
tty3*       0:5 0660
tty4*       0:5 0660
tty5*       0:5 0660
tty6*       0:5 0660
ttyS*       0:5 0640
urandom     0:0 0444
zero        0:0 0666
CONTENT

touch etc/mtab # For filesystem related commands to works

# The following code depends on the exact toolchain path & its depth

# Take only .so's from under libc and that also only at one level
for f in `find /opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux/arm-linux-gnueabihf/libc -maxdepth 4 -type f -name "*.so*"`
do
    dest=`echo ${f} | cut -d/ -f6-`
    install -D ${f} ${dest}
    # Giving the full path for it to work w/ sudo as well
    /opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux/bin/arm-linux-gnueabihf-strip ${dest} 2> /dev/null
done

for f in `find /opt/gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux/arm-linux-gnueabihf/libc -maxdepth 4 -type l -name "*.so*"`
do
    dest=`echo ${f} | cut -d/ -f6-`
    mkdir -p `dirname ${dest}`
    cp -d ${f} `dirname ${dest}`
done

exit 0