overlay/etc/fstab

/dev/mmcblk1p1	/boot	vfat	defaults	0	0
/dev/mmcblk1p2	/	ext4	defaults,discard,noatime,nodiratime	0	1

none	/proc	proc	defaults	0	0
none	/sys	sysfs	defaults	0	0
none    /tmp    tmpfs   nodev		0	0