System Details

uname -a
Linux RT-AC3100 2.6.36.4brcmarm #1 SMP PREEMPT Wed Jul 25 12:44:34 EDT 2018 armv7l ASUSWRT-Merlin

mount
rootfs on / type rootfs (rw)
/dev/root on / type squashfs (ro,relatime)
devtmpfs on /dev type devtmpfs (rw,relatime,size=257448k,nr_inodes=64362,mode=755)
proc on /proc type proc (rw,relatime)
tmpfs on /tmp type tmpfs (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
/dev/mtdblock4 on /jffs type jffs2 (rw,noatime)
usbfs on /proc/bus/usb type usbfs (rw,relatime)
/dev/sda2 on /tmp/mnt/entwareNG type ext4 (rw,nodev,relatime,user_xattr,barrier=1,data=ordered)
nfsd on /proc/fs/nfsd type nfsd (rw,relatime)

df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                36.1M     36.1M         0 100% /
devtmpfs                251.4M         0    251.4M   0% /dev
tmpfs                   251.6M      2.1M    249.5M   1% /tmp
/dev/mtdblock4           64.0M      2.8M     61.2M   4% /jffs
/dev/sda2               915.9G    480.8G    388.5G  55% /tmp/mnt/entwareNG

free-h
             total       used       free     shared    buffers     cached
Mem:        515184     358232     156952          0       2248     175312
-/+ buffers/cache:     180672     334512
Swap:      1048572          0    1048572