How do I login to my i.MX6ULL evk board?

pablocottens — Wed, 07 Jun 2017 01:39:19 GMT

Hello,

I just bought this board recently and I've compiled the kernel for the first time ever because I wanted to use Debian on my board, so I followed the instructions found here Install Debian 8 Jessie Rootfs on NXP i.MX6ULL EVK board

I compiled u-boot and the kernel without any problems. And I used release 17.02 instead of using the one listed in the instructions (16.04 if I'm not mistaken) because for some reason it was downloading about 10 times slower than the one I used.

I was able t do everything correctly and I can and I can see "Debian GNU/Linux 8 linaro-alip ttymxc0 " after booting everything but when it tries to autologin with root it sends an authentication failure. It tries 3 times and after that I get the following text.

"fec 2188000.ethernet eth1: Link is Up - 100Mbps/Full - flow control rx/tx
random: nonblocking pool is initialized"

Obviously the first is telling me that if is up (I even tried sshing into my board), but the last line is a mistery to me.

Obs: I tried the following passwords: "root", "linaro", "", "debian" and none of them worked.

Just in case you need it, I'll post the entire debug message I got from the serial port. But I guess that the only thing I'm missing is a password. OBS: I was getting an error when unpacking rootfs (simply said an error occurred even though the content unpacked was the same as the one in the tar ball), so I tried unpacking without the -v flag and then I noticed many errors due to not having the permissions so I chmod 777 it. That and the newer version of the rootfs are the only things I modified. I'm using mint on a VM to compile everything

U-Boot 2016.03 (May 26 2017 - 09:14:55 -0300)

CPU:   Freescale i.MX6ULL rev1.0 528 MHz (running at 396 MHz)
CPU:   Commercial temperature grade (0C to 95C) at 32C
Reset cause: POR
Board: MX6ULL 14x14 EVK
I2C:   ready
DRAM: 512 MiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
*** Warning - bad CRC, using default environment

Display: TFT43AB (480x272)
Video: 480x272x24
In:    serial
Out:   serial
Err:   serial
switch to partitions #0, OK
mmc1 is current device
Net:   FEC1
Normal Boot
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc1 is current device
switch to partitions #0, OK
mmc1 is current device
reading boot.scr
** Unable to read file boot.scr **
reading zImage
6673232 bytes read in 301 ms (21.1 MiB/s)
Booting from mmc ...
reading imx6ull-14x14-evk.dtb
35969 bytes read in 21 ms (1.6 MiB/s)
Kernel image @ 0x80800000 [ 0x000000 - 0x65d350 ]
## Flattened Device Tree blob at 83000000
   Booting using the fdt blob at 0x83000000
   Using Device Tree in place at 83000000, end 8300bc80

Starting kernel ...

Booting Linux on physical CPU 0x0
Linux version 4.1.15 (pablo@pablo-VirtualBox) (gcc version 5.4.0 20160609 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.4) ) #1 SMP PREEMPT Fri May 26 10:07:21 BRT 2017
CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c53c7d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine model: Freescale i.MX6 ULL 14x14 EVK Board
Reserved memory: created CMA memory pool at 0x8c000000, size 320 MiB
Reserved memory: initialized node linux,cma, compatible id shared-dma-pool
Memory policy: Data cache writealloc
PERCPU: Embedded 12 pages/cpu @8bb32000 s16908 r8192 d24052 u49152
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 130048
Kernel command line: console=ttymxc0,115200 root=/dev/mmcblk1p2 rootwait rw
PID hash table entries: 2048 (order: 1, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 178564K/524288K available (8404K kernel code, 443K rwdata, 2932K rodata, 444K init, 450K bss, 18044K reserved, 327680K cma-reserved, 0K highmem)
Virtual kernel memory layout:
    vector : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap : 0xffc00000 - 0xfff00000   (3072 kB)
    vmalloc : 0xa0800000 - 0xff000000   (1512 MB)
    lowmem : 0x80000000 - 0xa0000000   ( 512 MB)
    pkmap   : 0x7fe00000 - 0x80000000   (   2 MB)
    modules : 0x7f000000 - 0x7fe00000   ( 14 MB)
      .text : 0x80008000 - 0x80b1a434   (11338 kB)
      .init : 0x80b1b000 - 0x80b8a000   ( 444 kB)
      .data : 0x80b8a000 - 0x80bf8c20   ( 444 kB)
       .bss : 0x80bfb000 - 0x80c6b880   ( 451 kB)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Preemptible hierarchical RCU implementation.
        Additional per-CPU info printed with stalls.
        RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=1.
RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
NR_IRQS:16 nr_irqs:16 16
mxc_clocksource_init 3000000
Switching to timer-based delay loop, resolution 333ns
sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 715827882841ns
clocksource mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 637086815595 ns
Console: colour dummy device 80x30
Calibrating delay loop (skipped), value calculated using timer frequency.. 6.00 BogoMIPS (lpj=30000)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
CPU: Testing write buffer coherency: ok
/cpus/cpu@0 missing clock-frequency property
CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
Setting up static identity map for 0x80008280 - 0x800082d8
Brought up 1 CPUs
SMP: Total of 1 processors activated (6.00 BogoMIPS).
CPU: All CPU(s) started in SVC mode.
devtmpfs: initialized
device-tree: Duplicate name in lcdif@021c8000, renamed to "display#1"
VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
clocksource jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
pinctrl core: initialized pinctrl subsystem
NET: Registered protocol family 16
DMA: preallocated 256 KiB pool for atomic coherent allocations
cpuidle: using governor ladder
cpuidle: using governor menu
hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
hw-breakpoint: maximum watchpoint size is 8 bytes.
imx6ul-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver
imx6ul-pinctrl 2290000.iomuxc-snvs: initialized IMX pinctrl driver
mxs-dma 1804000.dma-apbh: initialized
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
i2c i2c-0: IMX I2C adapter registered
i2c i2c-0: can't use DMA
i2c i2c-1: IMX I2C adapter registered
i2c i2c-1: can't use DMA
Linux video capture interface: v2.00
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
PTP clock support registered
MIPI CSI2 driver module loaded
Advanced Linux Sound Architecture Driver Initialized.
Bluetooth: Core ver 2.20
NET: Registered protocol family 31
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
Bluetooth: L2CAP socket layer initialized
Bluetooth: SCO socket layer initialized
Switched to clocksource mxc_timer1
NET: Registered protocol family 2
TCP established hash table entries: 4096 (order: 2, 16384 bytes)
TCP bind hash table entries: 4096 (order: 3, 32768 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
UDP hash table entries: 256 (order: 1, 8192 bytes)
UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
imx rpmsg driver is registered.
Bus freq driver module loaded
futex hash table entries: 256 (order: 2, 16384 bytes)
VFS: Disk quotas dquot_6.6.0
VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
NFS: Registering the id_resolver key type
Key type id_resolver registered
Key type id_legacy registered
jffs2: version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
fuse init (API version 7.23)
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
imx-weim 21b8000.weim: Driver registered.
backlight supply power not found, using dummy regulator
MIPI DSI driver module loaded
MIPI DSI driver module loaded
21c8000.lcdif supply lcd not found, using dummy regulator
mxsfb 21c8000.lcdif: failed to find mxc display driver
Console: switching to colour frame buffer device 60x34
mxsfb 21c8000.lcdif: initialized
imx-sdma 20ec000.sdma: no event needs to be remapped
imx-sdma 20ec000.sdma: loaded firmware 3.3
imx-sdma 20ec000.sdma: initialized
2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 18, base_baud = 5000000) is a IMX
console [ttymxc0] enabled
21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 235, base_baud = 5000000) is a IMX
imx-rng 2284000.rngb: iMX RNG Registered.
imx sema4 driver is registered.
[drm] Initialized drm 1.1.0 20060810
[drm] Initialized vivante 1.0.0 20120216 on minor 0
brd: module loaded
loop: module loaded
fsl-quadspi 21e0000.qspi: n25q256a (32768 Kbytes)
spi_gpio spi4: gpio-miso property not found, switching to no-rx mode
CAN device driver interface
flexcan 2090000.can: device registered (reg_base=a09f8000, irq=27)
flexcan 2094000.can: device registered (reg_base=a0a00000, irq=28)
20b4000.ethernet supply phy not found, using dummy regulator
pps pps0: new PPS source ptp0
libphy: fec_enet_mii_bus: probed
fec 20b4000.ethernet eth0: registered PHC device 0
2188000.ethernet supply phy not found, using dummy regulator
pps pps1: new PPS source ptp1
fec 2188000.ethernet eth1: registered PHC device 1
usbcore: registered new interface driver asix
usbcore: registered new interface driver ax88179_178a
usbcore: registered new interface driver cdc_ether
usbcore: registered new interface driver net1080
usbcore: registered new interface driver cdc_subset
usbcore: registered new interface driver zaurus
usbcore: registered new interface driver cdc_ncm
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ehci-mxc: Freescale On-Chip EHCI Host driver
usbcore: registered new interface driver usb-storage
usbcore: registered new interface driver usb_ehset_test
2184800.usbmisc supply vbus-wakeup not found, using dummy regulator
2184000.usb supply vbus not found, using dummy regulator
2184200.usb supply vbus not found, using dummy regulator
ci_hdrc ci_hdrc.1: EHCI Host Controller
ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 1
ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
mousedev: PS/2 mouse device common for all mice
input: 20cc000.snvs:snvs-powerkey as /devices/platform/soc/2000000.aips-bus/20cc000.snvs/20cc000.snvs:snvs-powerkey/input/input0
input: iMX6UL TouchScreen Controller as /devices/platform/soc/2000000.aips-bus/2040000.tsc/input/input1
input: FreescaleAccelerometer as /devices/virtual/input/input2
fxls8471 device driver probe successfully
snvs_rtc 20cc000.snvs:snvs-rtc-lp: rtc core: registered 20cc000.snvs:snvs-r as rtc0
i2c /dev entries driver
IR NEC protocol handler initialized
IR RC5(x/sz) protocol handler initialized
IR RC6 protocol handler initialized
IR JVC protocol handler initialized
IR Sony protocol handler initialized
IR SANYO protocol handler initialized
IR Sharp protocol handler initialized
IR MCE Keyboard/mouse protocol handler initialized
IR XMP protocol handler initialized
pxp-v4l2 pxp_v4l2: initialized
0-000e supply vdd not found, using dummy regulator
0-000e supply vddio not found, using dummy regulator
mag3110 0-000e: check mag3110 chip ID
input: mag3110 as /devices/virtual/input/input3
mag3110 0-000e: mag3110 is probed
imx2-wdt 20bc000.wdog: use WDOG_B to reboot.
imx2-wdt 20bc000.wdog: timeout 60 sec (nowayout=0)
Bluetooth: HCI UART driver ver 2.3
Bluetooth: HCI UART protocol H4 registered
Bluetooth: HCI UART protocol BCSP registered
Bluetooth: HCI UART protocol ATH3K registered
usbcore: registered new interface driver bcm203x
usbcore: registered new interface driver btusb
usbcore: registered new interface driver ath3k
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
sdhci-pltfm: SDHCI platform and OF driver helper
/soc/aips-bus@02100000/usdhc@02190000: voltage-ranges unspecified
sdhci-esdhc-imx 2190000.usdhc: Got CD GPIO
sdhci-esdhc-imx 2190000.usdhc: No vqmmc regulator found
mmc0: SDHCI controller on 2190000.usdhc [2190000.usdhc] using ADMA
/soc/aips-bus@02100000/usdhc@02194000: voltage-ranges unspecified
sdhci-esdhc-imx 2194000.usdhc: could not get ultra high speed state, work on normal mode
sdhci-esdhc-imx 2194000.usdhc: No vmmc regulator found
sdhci-esdhc-imx 2194000.usdhc: No vqmmc regulator found
mmc1: SDHCI controller on 2194000.usdhc [2194000.usdhc] using ADMA
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
fsl-asrc 2034000.asrc: driver registered
mmc1: host does not support reading read-only switch, assuming write-enable
imx-wm8960 sound: wm8960-hifi <-> 202c000.sai mapping ok
mmc1: new high speed SDHC card at address 0001
imx-wm8960 sound: snd-soc-dummy-dai <-> 2034000.asrc mapping ok
mmcblk1: mmc1:0001 SD8GB 7.24 GiB
imx-wm8960 sound: wm8960-hifi <-> 202c000.sai mapping ok
mmcblk1: p1 p2
NET: Registered protocol family 26
NET: Registered protocol family 10
sit: IPv6 over IPv4 tunneling driver
NET: Registered protocol family 17
can: controller area network core (rev 20120528 abi 9)
NET: Registered protocol family 29
can: raw protocol (rev 20120528)
can: broadcast manager protocol (rev 20120528 t)
can: netlink gateway (rev 20130117) max_hops=1
Bluetooth: RFCOMM TTY layer initialized
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM ver 1.11
Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Bluetooth: BNEP filters: protocol multicast
Bluetooth: BNEP socket layer initialized
Bluetooth: HIDP (Human Interface Emulation) ver 1.2
Bluetooth: HIDP socket layer initialized
8021q: 802.1Q VLAN Support v1.8
Key type dns_resolver registered
dhd_module_init in
snvs_rtc 20cc000.snvs:snvs-rtc-lp: setting system clock to 1970-01-01 00:15:16 UTC (916)
gpio_dvfs: disabling
VSD_3V3: disabling
can-3v3: disabling
ALSA device list:
#0: wm8960-audio
kjournald starting. Commit interval 5 seconds
EXT3-fs (mmcblk1p2): using internal journal
EXT3-fs (mmcblk1p2): recovery complete
EXT3-fs (mmcblk1p2): mounted filesystem with ordered data mode
VFS: Mounted root (ext3 filesystem) on device 179:2.
devtmpfs: mounted
Freeing unused kernel memory: 444K (80b1b000 - 80b8a000)
systemd[1]: Failed to insert module 'kdbus': Function not implemented
random: systemd urandom read with 23 bits of entropy available

Welcome to Debian GNU/Linux 8 (jessie)!

[ OK ] Created slice User and Session Slice.
[ OK ] Listening on Journal Socket (/dev/log).
[ OK ] Listening on /dev/initctl Compatibility Named Pipe.
[ OK ] Started Forward Password Requests to Wall Directory Watch.
[ OK ] Created slice System Slice.
[ OK ] Created slice system-serial\x2dgetty.slice.
[ OK ] Reached target Encrypted Volumes.
[ OK ] Listening on udev Kernel Socket.
[ OK ] Reached target Slices.
[ OK ] Set up automount Arbitrary Executab...ats File System Automount Point.
[ OK ] Listening on udev Control Socket.
[ OK ] Reached target Swap.
[ OK ] Listening on Journal Socket.
         Starting Load Kernel Modules...
         Starting Create Static Device Nodes in /dev...
         Mounting Debug File System...
         Starting Nameserver information manager...
[ OK ] Created slice system-getty.slice.
[ OK ] Listening on Syslog Socket.
         Starting Journal Service...
[ OK ] Reached target Remote File Systems (Pre).
[ OK ] Reached target Remote File Systems.
         Starting LSB: Prepare console...
[ OK ] Started Load Kernel Modules.
         Starting Apply Kernel Variables...
         Mounting FUSE Control File System...
[ OK ] Mounted Debug File System.
[ OK ] Started Create Static Device Nodes in /dev.
[ OK ] Started Apply Kernel Variables.
[ OK ] Mounted FUSE Control File System.
[ OK ] Started Nameserver information manager.
[ OK ] Started Journal Service.
[ OK ] Started LSB: Prepare console.
         Starting LSB: Set console font and keymap...
         Starting udev Kernel Device Manager...
[ OK ] Started udev Kernel Device Manager.
         Starting LSB: Set preliminary keymap...
cfg80211: World regulatory domain updated:
cfg80211: DFS Master region: unset
cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 2000 mBm), (N/A)
cfg80211:   (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (N/A)
cfg80211:   (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (0 s)
cfg80211:   (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 2000 mBm), (0 s)
cfg80211:   (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 2000 mBm), (N/A)
cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0 mBm), (N/A)
[ OK ] Started LSB: Set preliminary keymap.
[ OK ] Started LSB: Set console font and keymap.
         Starting Remount Root and Kernel File Systems...
[ OK ] Started Remount Root and Kernel File Systems.
         Starting Flush Journal to Persistent Storage...
         Starting udev Coldplug all Devices...
[ OK ] Reached target Local File Systems (Pre).
[ OK ] Reached target Local File Systems.
         Starting Tell Plymouth To Write Out Runtime Data...
         Starting Load/Save Random Seed...
[ OK ] Started Tell Plymouth To Write Out Runtime Data.
[ OK ] Started Load/Save Random Seed.
systemd-journald[107]: Received request to flush runtime journal from PID 1
[ OK ] Started Flush Journal to Persistent Storage.
         Starting Create Volatile Files and Directories...
         Starting LSB: Raise network interfaces....
[ OK ] Started Create Volatile Files and Directories.
         Starting Network Time Synchronization...
         Starting Update UTMP about System Boot/Shutdown...
[ OK ] Started Network Time Synchronization.
[ OK ] Started Update UTMP about System Boot/Shutdown.
[ OK ] Reached target System Time Synchronized.
[ OK ] Started LSB: Raise network interfaces..
[ OK ] Started udev Coldplug all Devices.
[ OK ] Found device /dev/ttymxc0.
[ OK ] Started Dispatch Password Requests to Console Directory Watch.
[ OK ] Created slice system-systemd\x2dbacklight.slice.
         Starting Load/Save Screen Backlight...htness of backlight:backlight...
[ OK ] Reached target Network.
[ OK ] Reached target Network is Online.
[ OK ] Started Load/Save Screen Backlight Brightness of backlight:backlight.
[ OK ] Reached target System Initialization.
[ OK ] Started Daily Cleanup of Temporary Directories.
[ OK ] Reached target Timers.
[ OK ] Listening on D-Bus System Message Bus Socket.
[ OK ] Listening on ACPID Listen Socket.
[ OK ] Reached target Sockets.
[ OK ] Started Trigger resolvconf update for networkd DNS.
[ OK ] Started ACPI Events Check.
[ OK ] Reached target Paths.
[ OK ] Reached target Basic System.
[ OK ] Started D-Bus System Message Bus.
         Starting Network Manager...
         Starting Initialize hardware monitoring sensors...
         Starting Login Service...
[ OK ] Started OpenBSD Secure Shell server.
         Starting LSB: Advanced IEEE 802.11 management daemon...
         Starting System Logging Service...
[ OK ] Started Run anacron jobs.
         Starting /etc/rc.local Compatibility...
         Starting LSB: Load kernel modules needed to enable cpufreq scaling...
[ OK ] Started ACPI event daemon.
         Starting LSB: network benchmark...
         Starting Permit User Sessions...
[ OK ] Started LSB: Advanced IEEE 802.11 management daemon.
[ OK ] Started /etc/rc.local Compatibility.
[ OK ] Started Permit User Sessions.
[ OK ] Started System Logging Service.
[ OK ] Started LSB: network benchmark.
[ OK ] Started Initialize hardware monitoring sensors.
[ OK ] Started LSB: Load kernel modules needed to enable cpufreq scaling.
[ OK ] Started Login Service.
         Starting Authenticate and Authorize Users to Run Privileged Tasks...
[ OK ] Reached target Sound Card.
         Starting LSB: set CPUFreq kernel parameters...
         Starting Light Display Manager...
         Starting Terminate Plymouth Boot Screen...
         Starting Wait for Plymouth Boot Screen to Quit...
[ OK ] Started Terminate Plymouth Boot Screen.
[ OK ] Started Wait for Plymouth Boot Screen to Quit.
[ OK ] Started LSB: set CPUFreq kernel parameters.
[ OK ] Started Authenticate and Authorize Users to Run Privileged Tasks.
[ OK ] Started Light Display Manager.
[ OK ] Started Network Manager.
fec 20b4000.ethernet eth0: Freescale FEC PHY driver [Micrel KSZ8081 or KSZ8091] (mii_bus:phy_addr=20b4000.ethernet:01, irq=-1)
[ OK ] Started Getty on tty1.
[ OK ] Started Serial Getty on ttymxc0.
[ OK ] Reached target Login Prompts.
[ OK ] Reached target Multi-User System.
[ OK ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
fec 2188000.ethernet eth1: Freescale FEC PHY driver [Micrel KSZ8081 or KSZ8091] (mii_bus:phy_addr=20b4000.ethernet:02, irq=-1)
[ OK ] Started Update UTMP about System Runlevel Changes.

Debian GNU/Linux 8 linaro-alip ttymxc0