When trying to install a small app (ipHome) from the garage, I get a message saying "Not enough free memory on device. Downloading paused."

df gives:

Filesystem 1k-blocks Used Available Use% Mounted on
/dev/mtdblock4 2048 2048 0 100% /mnt/initfs
none 512 120 392 23% /mnt/initfs/tmp
/dev/mtdblock4 257536 121308 136228 47% /
none 512 120 392 23% /tmp
none 1024 60 964 6% /dev
/dev/mmcblk1p1 1992320 1678592 313728 84% /media/mmc1
/dev/mmcblk0p1 1992320 234976 1757344 12% /media/mmc2

I guess that initfs is the problem, but what is it and what can I do?