pi@raspberrypi:~ $ dmesg
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.14.34-v7+ (dc4@dc4-XPS13-9333) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.22.0-88-g8460611)) #1110 SMP Mon Apr 16 15:18:51 BST 2018
[    0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d
[    0.000000] CPU: div instructions available: patching division code
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: Raspberry Pi 3 Model B Rev 1.2
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] cma: Reserved 8 MiB at 0x3ac00000
[    0.000000] On node 0 totalpages: 242688
[    0.000000] free_area_init_node: node 0, pgdat 80c84e40, node_mem_map ba3a1000
[    0.000000]   Normal zone: 2133 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 242688 pages, LIFO batch:31
[    0.000000] random: fast init done
[    0.000000] percpu: Embedded 17 pages/cpu @ba34a000 s38720 r8192 d22720 u69632
[    0.000000] pcpu-alloc: s38720 r8192 d22720 u69632 alloc=17*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 240555
[    0.000000] Kernel command line: 8250.nr_uarts=0 bcm2708_fb.fbwidth=800 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=PARTUUID=d67ac0c5-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
[    0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Memory: 940236K/970752K available (7168K kernel code, 575K rwdata, 2072K rodata, 1024K init, 706K bss, 22324K reserved, 8192K cma-reserved)
[    0.000000] Virtual kernel memory layout:
                   vector  : 0xffff0000 - 0xffff1000   (   4 kB)
                   fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
                   vmalloc : 0xbb800000 - 0xff800000   (1088 MB)
                   lowmem  : 0x80000000 - 0xbb400000   ( 948 MB)
                   modules : 0x7f000000 - 0x80000000   (  16 MB)
                     .text : 0x80008000 - 0x80800000   (8160 kB)
                     .init : 0x80b00000 - 0x80c00000   (1024 kB)
                     .data : 0x80c00000 - 0x80c8fd4c   ( 576 kB)
                      .bss : 0x80c96f4c - 0x80d478b4   ( 707 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] ftrace: allocating 25231 entries in 74 pages
[    0.000000] Hierarchical RCU implementation.
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] arch_timer: cp15 timer(s) running at 19.20MHz (phys).
[    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns
[    0.000007] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
[    0.000019] Switching to timer-based delay loop, resolution 52ns
[    0.000265] Console: colour dummy device 80x30
[    0.000284] console [tty1] enabled
[    0.000308] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000)
[    0.000324] pid_max: default: 32768 minimum: 301
[    0.000638] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.000653] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.001592] Disabling memory control group subsystem
[    0.001670] CPU: Testing write buffer coherency: ok
[    0.002066] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.002441] Setting up static identity map for 0x100000 - 0x10003c
[    0.002558] Hierarchical SRCU implementation.
[    0.003190] smp: Bringing up secondary CPUs ...
[    0.003873] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.004623] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
[    0.005355] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
[    0.005459] smp: Brought up 1 node, 4 CPUs
[    0.005470] SMP: Total of 4 processors activated (153.60 BogoMIPS).
[    0.005475] CPU: All CPU(s) started in HYP mode.
[    0.005479] CPU: Virtualization extensions available.
[    0.006329] devtmpfs: initialized
[    0.017070] VFP support v0.3: implementor 41 architecture 3 part 40 variant 3 rev 4
[    0.017291] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.017309] futex hash table entries: 1024 (order: 4, 65536 bytes)
[    0.017867] pinctrl core: initialized pinctrl subsystem
[    0.018604] NET: Registered protocol family 16
[    0.021323] DMA: preallocated 1024 KiB pool for atomic coherent allocations
[    0.026125] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[    0.026132] hw-breakpoint: maximum watchpoint size is 8 bytes.
[    0.026335] Serial: AMBA PL011 UART driver
[    0.028161] bcm2835-mbox 3f00b880.mailbox: mailbox enabled
[    0.028618] uart-pl011 3f201000.serial: could not find pctldev for node /soc/gpio@7e200000/uart0_pins, deferring probe
[    0.059696] bcm2835-dma 3f007000.dma: DMA legacy API manager at bb813000, dmachans=0x1
[    0.061188] SCSI subsystem initialized
[    0.061409] usbcore: registered new interface driver usbfs
[    0.061460] usbcore: registered new interface driver hub
[    0.061543] usbcore: registered new device driver usb
[    0.070086] raspberrypi-firmware soc:firmware: Attached to firmware from 2018-04-16 18:16
[    0.071491] clocksource: Switched to clocksource arch_sys_counter
[    0.148909] VFS: Disk quotas dquot_6.6.0
[    0.148993] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.149180] FS-Cache: Loaded
[    0.149378] CacheFiles: Loaded
[    0.158186] NET: Registered protocol family 2
[    0.158909] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
[    0.159018] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[    0.159203] TCP: Hash tables configured (established 8192 bind 8192)
[    0.159334] UDP hash table entries: 512 (order: 2, 16384 bytes)
[    0.159378] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
[    0.159605] NET: Registered protocol family 1
[    0.160046] RPC: Registered named UNIX socket transport module.
[    0.160052] RPC: Registered udp transport module.
[    0.160056] RPC: Registered tcp transport module.
[    0.160062] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.161662] hw perfevents: enabled with armv7_cortex_a7 PMU driver, 7 counters available
[    0.164393] workingset: timestamp_bits=14 max_order=18 bucket_order=4
[    0.172306] FS-Cache: Netfs 'nfs' registered for caching
[    0.172894] NFS: Registering the id_resolver key type
[    0.172927] Key type id_resolver registered
[    0.172932] Key type id_legacy registered
[    0.172947] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[    0.174799] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251)
[    0.174920] io scheduler noop registered
[    0.174926] io scheduler deadline registered (default)
[    0.175205] io scheduler cfq registered
[    0.175212] io scheduler mq-deadline registered
[    0.175218] io scheduler kyber registered
[    0.177912] BCM2708FB: allocated DMA memory fad10000
[    0.177939] BCM2708FB: allocated DMA channel 0 @ bb813000
[    0.189436] Console: switching to colour frame buffer device 100x30
[    0.197160] bcm2835-rng 3f104000.rng: hwrng registered
[    0.197290] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB)
[    0.197757] vc-sm: Videocore shared memory driver
[    0.198024] gpiomem-bcm2835 3f200000.gpiomem: Initialised: Registers at 0x3f200000
[    0.207532] brd: module loaded
[    0.216173] loop: module loaded
[    0.216185] Loading iSCSI transport class v2.0-870.
[    0.216804] libphy: Fixed MDIO Bus: probed
[    0.216893] usbcore: registered new interface driver lan78xx
[    0.216946] usbcore: registered new interface driver smsc95xx
[    0.216961] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[    0.445389] Core Release: 2.80a
[    0.445398] Setting default values for core params
[    0.445428] Finished setting default values for core params
[    0.645667] Using Buffer DMA mode
[    0.645674] Periodic Transfer Interrupt Enhancement - disabled
[    0.645679] Multiprocessor Interrupt Enhancement - disabled
[    0.645685] OTG VER PARAM: 0, OTG VER FLAG: 0
[    0.645699] Dedicated Tx FIFOs mode
[    0.646071] WARN::dwc_otg_hcd_init:1046: FIQ DMA bounce buffers: virt = 0xbad04000 dma = 0xfad04000 len=9024
[    0.646095] FIQ FSM acceleration enabled for :
               Non-periodic Split Transactions
               Periodic Split Transactions
               High-Speed Isochronous Endpoints
               Interrupt/Control Split Transaction hack enabled
[    0.646102] dwc_otg: Microframe scheduler enabled
[    0.646156] WARN::hcd_init_fiq:459: FIQ on core 1 at 0x805e6a40
[    0.646167] WARN::hcd_init_fiq:460: FIQ ASM at 0x805e6da8 length 36
[    0.646179] WARN::hcd_init_fiq:486: MPHI regs_base at 0xbb87e000
[    0.646234] dwc_otg 3f980000.usb: DWC OTG Controller
[    0.646266] dwc_otg 3f980000.usb: new USB bus registered, assigned bus number 1
[    0.646296] dwc_otg 3f980000.usb: irq 62, io mem 0x00000000
[    0.646343] Init: Port Power? op_state=1
[    0.646348] Init: Power Port (0)
[    0.646547] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    0.646558] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    0.646567] usb usb1: Product: DWC OTG Controller
[    0.646575] usb usb1: Manufacturer: Linux 4.14.34-v7+ dwc_otg_hcd
[    0.646583] usb usb1: SerialNumber: 3f980000.usb
[    0.647163] hub 1-0:1.0: USB hub found
[    0.647207] hub 1-0:1.0: 1 port detected
[    0.647702] dwc_otg: FIQ enabled
[    0.647707] dwc_otg: NAK holdoff enabled
[    0.647712] dwc_otg: FIQ split-transaction FSM enabled
[    0.647722] Module dwc_common_port init
[    0.647924] usbcore: registered new interface driver usb-storage
[    0.648088] mousedev: PS/2 mouse device common for all mice
[    0.648157] IR NEC protocol handler initialized
[    0.648162] IR RC5(x/sz) protocol handler initialized
[    0.648167] IR RC6 protocol handler initialized
[    0.648172] IR JVC protocol handler initialized
[    0.648177] IR Sony protocol handler initialized
[    0.648182] IR SANYO protocol handler initialized
[    0.648187] IR Sharp protocol handler initialized
[    0.648193] IR MCE Keyboard/mouse protocol handler initialized
[    0.648198] IR XMP protocol handler initialized
[    0.648875] bcm2835-wdt 3f100000.watchdog: Broadcom BCM2835 watchdog timer
[    0.649133] bcm2835-cpufreq: min=600000 max=1200000
[    0.649485] sdhci: Secure Digital Host Controller Interface driver
[    0.649489] sdhci: Copyright(c) Pierre Ossman
[    0.649840] mmc-bcm2835 3f300000.mmc: could not get clk, deferring probe
[    0.650159] sdhost-bcm2835 3f202000.mmc: could not get clk, deferring probe
[    0.650250] sdhci-pltfm: SDHCI platform and OF driver helper
[    0.651686] ledtrig-cpu: registered to indicate activity on CPUs
[    0.651855] hidraw: raw HID events driver (C) Jiri Kosina
[    0.652005] usbcore: registered new interface driver usbhid
[    0.652010] usbhid: USB HID core driver
[    0.652724] vchiq: vchiq_init_state: slot_zero = bad80000, is_master = 0
[    0.654044] [vc_sm_connected_init]: start
[    0.662798] [vc_sm_connected_init]: end - returning 0
[    0.663368] Initializing XFRM netlink socket
[    0.663391] NET: Registered protocol family 17
[    0.663485] Key type dns_resolver registered
[    0.664015] Registering SWP/SWPB emulation handler
[    0.664580] registered taskstats version 1
[    0.670349] uart-pl011 3f201000.serial: cts_event_workaround enabled
[    0.670416] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2
[    0.672155] mmc-bcm2835 3f300000.mmc: mmc_debug:0 mmc_debug2:0
[    0.672165] mmc-bcm2835 3f300000.mmc: DMA channel allocated
[    0.732120] sdhost: log_buf @ bad07000 (fad07000)
[    0.811507] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1)
[    0.812494] of_cfs_init
[    0.812581] of_cfs_init: OK
[    0.813116] Waiting for root device PARTUUID=d67ac0c5-02...
[    0.861589] Indeed it is in host mode hprt0 = 00021501
[    0.931547] mmc0: host does not support reading read-only switch, assuming write-enable
[    0.934257] mmc0: new high speed SDHC card at address 0007
[    0.934704] mmcblk0: mmc0:0007 SL16G 14.5 GiB
[    0.936094]  mmcblk0: p1 p2
[    0.955777] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[    0.955828] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[    0.965311] devtmpfs: mounted
[    0.968311] Freeing unused kernel memory: 1024K
[    1.071567] usb 1-1: new high-speed USB device number 2 using dwc_otg
[    1.071706] Indeed it is in host mode hprt0 = 00001101
[    1.311832] usb 1-1: New USB device found, idVendor=0424, idProduct=9514
[    1.311846] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.312466] hub 1-1:1.0: USB hub found
[    1.312554] hub 1-1:1.0: 5 ports detected
[    1.434970] systemd[1]: System time before build time, advancing clock.
[    1.576600] NET: Registered protocol family 10
[    1.577767] Segment Routing with IPv6
[    1.588690] ip_tables: (C) 2000-2006 Netfilter Core Team
[    1.614128] systemd[1]: systemd 232 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN)
[    1.614685] systemd[1]: Detected architecture arm.
[    1.615759] systemd[1]: Set hostname to <raspberrypi>.
[    1.631552] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[    1.761893] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00
[    1.761908] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.764613] smsc95xx v1.0.6
[    1.864933] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-3f980000.usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:1c:f7:4d
[    2.098070] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[    2.098517] systemd[1]: Listening on udev Control Socket.
[    2.098746] systemd[1]: Listening on Syslog Socket.
[    2.098867] systemd[1]: Reached target Swap.
[    2.099583] systemd[1]: Created slice System Slice.
[    2.100352] systemd[1]: Listening on /dev/initctl Compatibility Named Pipe.
[    2.103410] systemd[1]: Mounting POSIX Message Queue File System...
[    2.161604] usb 1-1.3: new high-speed USB device number 4 using dwc_otg
[    2.243049] i2c /dev entries driver
[    2.292685] usb 1-1.3: New USB device found, idVendor=04e8, idProduct=6860
[    2.292703] usb 1-1.3: New USB device strings: Mfr=2, Product=3, SerialNumber=4
[    2.292712] usb 1-1.3: Product: Android
[    2.292720] usb 1-1.3: Manufacturer: Samsung
[    2.292729] usb 1-1.3: SerialNumber: 479009a508ceb0b4
[    2.673710] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[    2.783879] systemd-journald[86]: Received request to flush runtime journal from PID 1
[    2.964368] cdc_acm 1-1.3:1.1: ttyACM0: USB ACM device
[    2.965488] usbcore: registered new interface driver cdc_acm
[    2.965497] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[    3.064893] rpi-ft5406 rpi_ft5406: Probing device
[    3.069073] input: FT5406 memory based driver as /devices/virtual/input/input0
[    3.282318] snd_bcm2835: module is from the staging directory, the quality is unknown, you have been warned.
[    3.285264] bcm2835_alsa bcm2835_alsa: card created with 8 channels
[    4.827635] uart-pl011 3f201000.serial: no DMA platform data
[    5.133630] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup
[    5.134113] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    6.000923] Adding 102396k swap on /var/swap.  Priority:-2 extents:1 across:102396k SSFS
[    8.311583] Under-voltage detected! (0x00050005)
[    8.449788] random: crng init done
[   12.471594] Voltage normalised (0x00000000)
[   13.258614] Bluetooth: Core ver 2.22
[   13.258694] NET: Registered protocol family 31
[   13.258701] Bluetooth: HCI device and connection manager initialized
[   13.258720] Bluetooth: HCI socket layer initialized
[   13.258734] Bluetooth: L2CAP socket layer initialized
[   13.258767] Bluetooth: SCO socket layer initialized
[   13.288207] Bluetooth: HCI UART driver ver 2.3
[   13.288221] Bluetooth: HCI UART protocol H4 registered
[   13.288227] Bluetooth: HCI UART protocol Three-wire (H5) registered
[   13.288425] Bluetooth: HCI UART protocol Broadcom registered
[   13.607286] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   13.607299] Bluetooth: BNEP filters: protocol multicast
[   13.607318] Bluetooth: BNEP socket layer initialized
[   14.551574] Under-voltage detected! (0x00050005)
[   15.058294] Bluetooth: RFCOMM TTY layer initialized
[   15.058329] Bluetooth: RFCOMM socket layer initialized
[   15.058358] Bluetooth: RFCOMM ver 1.11
[   21.524998] fuse init (API version 7.26)
[   31.191598] Voltage normalised (0x00000000)