root@mmarm9:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mmcblk0p3 1008M 827M 130M 87% /
tmpfs 30M 0 30M 0% /lib/init/rw
udev 10M 136K 9.9M 2% /dev
tmpfs 30M 4.0K 30M 1% /dev/shm
root@mmarm9:~# mount
/dev/mmcblk0p3 on / type ext2 (rw,noatime,nodiratime,errors=remount-ro)
tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
udev on /dev type tmpfs (rw,mode=0755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)

mount: warning: /etc/mtab is not writable (e.g. read-only filesystem).
It's possible that information reported by mount(8) is not
up to date. For actual information about system mount points
check the /proc/mounts file.

root@mmarm9:~#

/dev/mmcblk0p3 / ext2 defaults,moderation,noatime,rw,errors=remount-ro 0 1

/dev/mmcblk0p3 / ext2 defaults,moderation,noatime,ro,errors=remount-ro 0 1

root@mmarm9:/etc# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 1008M 827M 130M 87% /
/dev/root 1008M 827M 130M 87% /
tmpfs 30M 0 30M 0% /lib/init/rw
tmpfs 10M 136K 9.9M 2% /dev
tmpfs 30M 4.0K 30M 1% /dev/shm
tmpfs 1.0M 56K 968K 6% /var/log
tmpfs 1.0M 0 1.0M 0% /tmp
tmpfs 1.0M 0 1.0M 0% /var/tmp
tmpfs 5.0M 20K 5.0M 1% /var/run
tmpfs 1.0M 0 1.0M 0% /var/lock
tmpfs 1.0M 4.0K 1020K 1% /var/lib/urandom
root@mmarm9:/etc#

lrwxrwxrwx 1 root root 12 Feb 13 08:42 mtab -> /proc/mounts