root@OpenWrt:~# mount
rootfs on / type rootfs (rw)
/dev/root on / type yaffs (rw,noatime)
proc on /proc type proc (rw,noatime)
sysfs on /sys type sysfs (rw,noatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noatime)
tmpfs on /dev type tmpfs (rw,relatime,size=512k,mode=755)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
debugfs on /sys/kernel/debug type debugfs (rw,noatime)


root@OpenWrt:~# dd if=/dev/zero of=/swap1 bs=1k count=16000
16000+0 records in
16000+0 records out
root@OpenWrt:~# chmod 0600 /swap1
root@OpenWrt:~# mkswap /swap1
Setting up swapspace version 1, size = 15996 KiB
no label, UUID=459b47e4-928e-44e7-9810-3d38d239b195
root@OpenWrt:~# swapon /swap1
block: failed to swapon /swap1 (-1)