root@OpenWrt:~# free
             total         used         free       shared      buffers
Mem:         29448        13396        16052            0         1216
-/+ buffers:              12180        17268
Swap:            0            0            0

root@OpenWrt:~# df -h
Filesystem                Size      Used Available Use% Mounted on
rootfs                    1.1M     84.0K      1.1M   7% /
/dev/root                 1.5M      1.5M         0 100% /rom
tmpfs                    14.4M      1.5M     12.9M  10% /tmp
tmpfs                   512.0K         0    512.0K   0% /dev
/dev/mtdblock3            1.1M     84.0K      1.1M   7% /overlay
overlayfs:/overlay        1.1M     84.0K      1.1M   7% /