root@OpenWrt:~# ubus call system board; df -h 
{
	"kernel": "4.1.4",
	"hostname": "OpenWrt",
	"system": "bcm63xx\/F@ST2704N (0x6318\/0xB0)",
	"model": "Sagem F@ST2704N",
	"release": {
		"distribution": "OpenWrt",
		"version": "Bleeding Edge",
		"revision": "r46566",
		"codename": "chaos_calmer",
		"target": "brcm63xx\/generic",
		"description": "OpenWrt Chaos Calmer r46566"
	}
}
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 2.0M      2.0M         0 100% /rom
tmpfs                    13.9M     56.0K     13.8M   0% /tmp
/dev/mtdblock3            4.6M    280.0K      4.4M   6% /overlay
overlayfs:/overlay        4.6M    280.0K      4.4M   6% /
tmpfs                   512.0K         0    512.0K   0% /dev