root@Arduino:~# df -h
Filesystem Size Used Available Use% Mounted on
rootfs 7.5M 3.9M 3.6M 52% /
/dev/root 7.0M 7.0M 0 100% /rom
tmpfs 29.9M 144.0K 29.7M 0% /tmp
tmpfs 512.0K 0 512.0K 0% /dev
/dev/mtdblock3 7.5M 3.9M 3.6M 52% /overlay
overlayfs:/overlay 7.5M 3.9M 3.6M 52% /
/dev/sda1 1.8G 0 1.8G 0% /mnt/sda1
Is it memory issue?