remount ro filesystem to rw filesystem

cmd> adb remount (option)

cmd> adb shell

$ su

# mount -o rw,remount /system

# mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system
또는
# mount -o rw,remount -t yaffs2 /dev/block/mtdblock0 /system