mount
rootfs on / type rootfs (rw)
ubi0:rootfs on / type ubifs (ro,relatime)
devtmpfs on /dev type devtmpfs (rw,size=177556k,nr_inodes=44389,mode=755)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,relatime,mode=777)
tmpfs on /tmp type tmpfs (rw,relatime,size=98304k,mode=777)
tmpfs on /media type tmpfs (rw,relatime)
ubi1:config on /etc/config type ubifs (rw,relatime)

cat proc/cpuinfo
machine         : stb9
processor       : 0
cpu family      : sh4
cpu variant     : st40-300
cpu type        : STxH205
cut             : 2.x
cpu flags       : fpu icbi synco fpchg
cache type      : split (harvard)
icache size     : 32KiB (2-way)
dcache size     : 32KiB (2-way)
address sizes   : 32 bits physical
bogomips        : 544.76

df -h
Filesystem                Size      Used Available Use% Mounted on
ubi0:rootfs              55.3M     55.3M         0 100% /
devtmpfs                173.4M         0    173.4M   0% /dev
tmpfs                   173.5M      4.0K    173.4M   0% /dev/shm
tmpfs                    96.0M    120.0K     95.9M   0% /tmp
tmpfs                   173.5M         0    173.5M   0% /media
ubi1:config               3.0M    120.0K      2.7M   4% /etc/config

uname -a
Linux 2.6.32.59-b2067 #1 Fri May 22 02:51:55 MSK 2015 sh4 GNU/Linux

mount -o rw,remount / 

mount -t ubifs -o remount,rw ubi0:rootfs /

 UBIFS: cannot re-mount due to prior errors