root@bpi:~# dmesg
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.9.0-m2u+ (root@buildbox) (gcc version 6.2.1 20161124 (Ubuntu/Linaro 6.2.1-5ubuntu1) ) #3 SMP Thu Dec 29 13:50:51 CET 2016
[    0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
[    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: Banana Pi BPI-M2-Ultra
[    0.000000] cma: Reserved 64 MiB at 0x7c000000
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] On node 0 totalpages: 262144
[    0.000000] free_area_init_node: node 0, pgdat c0fc5b00, node_mem_map ef6f9000
[    0.000000]   DMA zone: 1728 pages used for memmap
[    0.000000]   DMA zone: 0 pages reserved
[    0.000000]   DMA zone: 196608 pages, LIFO batch:31
[    0.000000]   HighMem zone: 65536 pages, LIFO batch:15
[    0.000000] percpu: Embedded 14 pages/cpu @ef6b5000 s26956 r8192 d22196 u57344
[    0.000000] pcpu-alloc: s26956 r8192 d22196 u57344 alloc=14*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 260416
[    0.000000] Kernel command line: console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootwait panic=10
[    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: 957160K/1048576K available (9216K kernel code, 872K rwdata, 3236K rodata, 1024K init, 336K bss, 25880K reserved, 65536K cma-reserved, 196608K highmem)
[    0.000000] Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
    vmalloc : 0xf0800000 - 0xff800000   ( 240 MB)
    lowmem  : 0xc0000000 - 0xf0000000   ( 768 MB)
    pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
    modules : 0xbf000000 - 0xbfe00000   (  14 MB)
      .text : 0xc0008000 - 0xc0a00000   (10208 kB)
      .init : 0xc0e00000 - 0xc0f00000   (1024 kB)
      .data : 0xc0f00000 - 0xc0fda3f0   ( 873 kB)
       .bss : 0xc0fdc000 - 0xc1030128   ( 337 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000]  Build-time adjustment of leaf fanout to 32.
[    0.000000]  RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=4.
[    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=32, nr_cpu_ids=4
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] arm_arch_timer: Architected cp15 timer(s) running at 24.00MHz (virt).
[    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x588fe9dc0, max_idle_ns: 440795202592 ns
[    0.000005] sched_clock: 56 bits at 24MHz, resolution 41ns, wraps every 4398046511097ns
[    0.000017] Switching to timer-based delay loop, resolution 41ns
[    0.000286] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[    0.000579] Console: colour dummy device 80x30
[    0.000612] Calibrating delay loop (skipped), value calculated using timer frequency.. 48.00 BogoMIPS (lpj=240000)
[    0.000624] pid_max: default: 32768 minimum: 301
[    0.000737] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.000747] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.001487] CPU: Testing write buffer coherency: ok
[    0.001833] CPU0: update cpu_capacity 1535
[    0.001844] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.001872] Setting up static identity map for 0x40100000 - 0x40100058
[    0.006963] Brought up 1 CPUs
[    0.006980] SMP: Total of 1 processors activated (48.00 BogoMIPS).
[    0.006988] CPU: All CPU(s) started in SVC mode.
[    0.007738] devtmpfs: initialized
[    0.011452] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
[    0.011691] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.013776] pinctrl core: initialized pinctrl subsystem
[    0.014924] NET: Registered protocol family 16
[    0.016295] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.017514] cpuidle: using governor ladder
[    0.017523] cpuidle: using governor menu
[    0.017720] No ATAGs?
[    0.017741] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[    0.017748] hw-breakpoint: maximum watchpoint size is 8 bytes.
[    0.018129] Serial: AMBA PL011 UART driver
[    0.037492] vgaarb: loaded
[    0.037932] SCSI subsystem initialized
[    0.038147] libata version 3.00 loaded.
[    0.038425] usbcore: registered new interface driver usbfs
[    0.038485] usbcore: registered new interface driver hub
[    0.038554] usbcore: registered new device driver usb
[    0.038868] media: Linux media interface: v0.10
[    0.038913] Linux video capture interface: v2.00
[    0.038979] pps_core: LinuxPPS API ver. 1 registered
[    0.038985] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    0.039005] PTP clock support registered
[    0.039101] EDAC MC: Ver: 3.0.0
[    0.040815] clocksource: Switched to clocksource arch_sys_counter
[    0.040959] VFS: Disk quotas dquot_6.6.0
[    0.041014] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.041153] FS-Cache: Loaded
[    0.041326] CacheFiles: Loaded
[    0.049903] NET: Registered protocol family 2
[    0.050542] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
[    0.050626] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[    0.050741] TCP: Hash tables configured (established 8192 bind 8192)
[    0.050828] UDP hash table entries: 512 (order: 2, 16384 bytes)
[    0.050887] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
[    0.051118] NET: Registered protocol family 1
[    0.051638] RPC: Registered named UNIX socket transport module.
[    0.051649] RPC: Registered udp transport module.
[    0.051655] RPC: Registered tcp transport module.
[    0.051660] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.051672] PCI: CLS 0 bytes, default 64
[    0.053383] futex hash table entries: 1024 (order: 4, 65536 bytes)
[    0.053530] audit: initializing netlink subsys (disabled)
[    0.053576] audit: type=2000 audit(0.040:1): initialized
[    0.054162] workingset: timestamp_bits=14 max_order=18 bucket_order=4
[    0.065922] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.068154] NFS: Registering the id_resolver key type
[    0.068186] Key type id_resolver registered
[    0.068191] Key type id_legacy registered
[    0.068234] ntfs: driver 2.1.32 [Flags: R/W].
[    0.068718] fuse init (API version 7.26)
[    0.072784] bounce: pool size: 64 pages
[    0.072860] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 247)
[    0.072870] io scheduler noop registered
[    0.072876] io scheduler deadline registered
[    0.073201] io scheduler cfq registered (default)
[    0.078338] sun8i-h3-pinctrl 1c20800.pinctrl: initialized sunXi PIO driver
[    0.080086] sun8i-h3-r-pinctrl 1f02c00.pinctrl: initialized sunXi PIO driver
[    0.081725] xenfs: not registering filesystem on non-xen platform
[    0.135252] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
[    0.138088] console [ttyS0] disabled
[    0.158286] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 34, base_baud = 1500000) is a U6_16550A
[    0.790494] console [ttyS0] enabled
[    0.816940] 1c28400.serial: ttyS1 at MMIO 0x1c28400 (irq = 35, base_baud = 1500000) is a U6_16550A
[    0.826466] STMicroelectronics ASC driver initialized
[    0.831948] [drm] Initialized
[    0.848847] brd: module loaded
[    0.857965] loop: module loaded
[    0.861724] Loading iSCSI transport class v2.0-870.
[    0.866990] iscsi: registered transport (tcp)
[    0.873415] libphy: Fixed MDIO Bus: probed
[    0.877910] CAN device driver interface
[    0.882360] pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB Ethernet driver
[    0.889817] usbcore: registered new interface driver pegasus
[    0.895548] usbcore: registered new interface driver smsc75xx
[    0.901361] usbcore: registered new interface driver smsc95xx
[    0.907210] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.913755] ehci-pci: EHCI PCI platform driver
[    0.918245] ehci-platform: EHCI generic platform driver
[    0.923734] ehci-omap: OMAP-EHCI Host Controller driver
[    0.929014] ehci-orion: EHCI orion driver
[    0.933095] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.939276] ohci-pci: OHCI PCI platform driver
[    0.943777] ohci-platform: OHCI generic platform driver
[    0.949171] ohci-omap3: OHCI OMAP3 driver
[    0.953492] usbcore: registered new interface driver usb-storage
[    0.959532] usbcore: registered new interface driver ums-realtek
[    0.966528] mousedev: PS/2 mouse device common for all mice
[    0.973366] sun6i-rtc 1c20400.rtc: rtc core: registered rtc-sun6i as rtc0
[    0.980148] sun6i-rtc 1c20400.rtc: RTC enabled
[    0.984889] i2c /dev entries driver
[    0.988830] IR NEC protocol handler initialized
[    0.993381] IR RC5(x/sz) protocol handler initialized
[    0.998425] IR RC6 protocol handler initialized
[    1.002963] IR JVC protocol handler initialized
[    1.007486] IR Sony protocol handler initialized
[    1.012107] IR SANYO protocol handler initialized
[    1.016803] IR Sharp protocol handler initialized
[    1.021511] IR MCE Keyboard/mouse protocol handler initialized
[    1.027334] IR XMP protocol handler initialized
[    1.031942] usbcore: registered new interface driver uvcvideo
[    1.037678] USB Video Class driver (1.1.1)
[    1.041781] gspca_main: v2.14.0 registered
[    1.046809] sunxi-wdt 1c20ca0.watchdog: Watchdog enabled (timeout=16 sec, nowayout=0)
[    1.055238] device-mapper: uevent: version 1.0.3
[    1.060222] device-mapper: ioctl: 4.35.0-ioctl (2016-06-23) initialised: dm-devel@redhat.com
[    1.069256] sdhci: Secure Digital Host Controller Interface driver
[    1.075469] sdhci: Copyright(c) Pierre Ossman
[    1.080039] Synopsys Designware Multimedia Card Interface Driver
[    1.087113] sunxi-mmc 1c0f000.mmc: Got CD GPIO
[    1.150837] sunxi-mmc 1c0f000.mmc: base:0xf08f1000 irq:23
[    1.210826] sunxi-mmc 1c10000.mmc: base:0xf08f5000 irq:24
[    1.217612] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 52, RE !!
[    1.223216] mmc0: host does not support reading read-only switch, assuming write-enable
[    1.231779] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 52, RE !!
[    1.238540] mmc0: new high speed SDHC card at address aaaa
[    1.246763] mmcblk0: mmc0:aaaa ACLCD 29.7 GiB
[    1.251239] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 8, RE !!
[    1.257537] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 5, RE !!
[    1.263146]  mmcblk0: p1 p2
[    1.265935] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 5, RE !!
[    1.271619] sunxi-mmc 1c11000.mmc: base:0xf08f9000 irq:25
[    1.277017] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 5, RE !!
[    1.282650] sdhci-pltfm: SDHCI platform and OF driver helper
[    1.289547] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 5, RE !!
[    1.295418] ledtrig-cpu: registered to indicate activity on CPUs
[    1.301451] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 55, RE !!
[    1.307122] hidraw: raw HID events driver (C) Jiri Kosina
[    1.313206] usbcore: registered new interface driver usbhid
[    1.318772] usbhid: USB HID core driver
[    1.323092] ipip: IPv4 and MPLS over IPv4 tunneling driver
[    1.329147] Initializing XFRM netlink socket
[    1.333995] NET: Registered protocol family 10
[    1.339449] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 55, RE !!
[    1.345262] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[    1.351822] NET: Registered protocol family 17
[    1.356278] NET: Registered protocol family 15
[    1.360747] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[    1.373709] can: controller area network core (rev 20120528 abi 9)
[    1.379937] NET: Registered protocol family 29
[    1.384393] can: raw protocol (rev 20120528)
[    1.388657] can: broadcast manager protocol (rev 20161123 t)
[    1.394374] 8021q: 802.1Q VLAN Support v1.8
[    1.398714] Key type dns_resolver registered
[    1.403165] ThumbEE CPU extension supported.
[    1.407439] Registering SWP/SWPB emulation handler
[    1.412961] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 55, RE !!
[    1.419083] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 55, RE !!
[    1.425490] sunxi-mmc 1c10000.mmc: smc 1 err, cmd 1, RE !!
[    1.434421] Key type encrypted registered
[    1.438448] sunxi-mmc 1c11000.mmc: smc 2 err, cmd 8, RTO !!
[    1.451275] input: gpio_keys as /devices/platform/gpio_keys/input/input0
[    1.458292] sun6i-rtc 1c20400.rtc: setting system clock to 1970-01-01 00:00:04 UTC (4)
[    1.468731] vcc3v0: disabling
[    1.471755] sunxi-mmc 1c11000.mmc: smc 2 err, cmd 55, RTO !!
[    1.477440] vcc5v0: disabling
[    1.482382] sunxi-mmc 1c11000.mmc: smc 2 err, cmd 55, RTO !!
[    1.488297] EXT4-fs (mmcblk0p2): couldn't mount as ext3 due to feature incompatibilities
[    1.496421] sunxi-mmc 1c11000.mmc: smc 2 err, cmd 55, RTO !!
[    1.503760] sunxi-mmc 1c11000.mmc: smc 2 err, cmd 55, RTO !!
[    1.569349] mmc2: new DDR MMC card at address 0001
[    1.575723] mmcblk2: mmc2:0001 8WPD3R 7.28 GiB
[    1.580570] mmcblk2boot0: mmc2:0001 8WPD3R partition 1 4.00 MiB
[    1.587704] mmcblk2boot1: mmc2:0001 8WPD3R partition 2 4.00 MiB
[    2.351502] random: fast init done
[    2.661653] random: crng init done
[    3.258514] EXT4-fs (mmcblk0p2): recovery complete
[    3.267424] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[    3.275578] VFS: Mounted root (ext4 filesystem) on device 179:2.
[    3.285407] devtmpfs: mounted
[    3.289490] Freeing unused kernel memory: 1024K (c0e00000 - c0f00000)
[    3.475754] systemd[1]: systemd 215 running in system mode. (+PAM +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ -SECCOMP -APPARMOR)
[    3.489476] systemd[1]: Detected architecture 'arm'.
[    3.524369] systemd[1]: Set hostname to <bpi>.
[    3.832224] systemd[1]: Cannot add dependency job for unit display-manager.service, ignoring: Unit display-manager.service failed to load: No such file or directory.
[    3.849002] systemd[1]: Starting Forward Password Requests to Wall Directory Watch.
[    3.857079] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[    3.864771] systemd[1]: Expecting device dev-ttyS0.device...
[    3.900931] systemd[1]: Starting Remote File Systems (Pre).
[    3.930888] systemd[1]: Reached target Remote File Systems (Pre).
[    3.937081] systemd[1]: Starting Dispatch Password Requests to Console Directory Watch.
[    5.111736] systemd-udevd[163]: starting version 215
[    6.293995] systemd-journald[182]: Received request to flush runtime journal from PID 1
[  366.560885] INFO: task mmcqd/2boot0:125 blocked for more than 120 seconds.
[  366.567763]       Not tainted 4.9.0-m2u+ #3
[  366.571974] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  366.579793] mmcqd/2boot0    D    0   125      2 0x00000000
[  366.585336] [<c099bc0c>] (__schedule) from [<c099bfe0>] (schedule+0x44/0x9c)
[  366.592402] [<c099bfe0>] (schedule) from [<c07d4180>] (__mmc_claim_host+0x98/0x1b8)
[  366.600057] [<c07d4180>] (__mmc_claim_host) from [<c07e69ec>] (mmc_blk_issue_rq+0x2cc/0x570)
[  366.608503] [<c07e69ec>] (mmc_blk_issue_rq) from [<c07e6d7c>] (mmc_queue_thread+0xec/0x19c)
[  366.616858] [<c07e6d7c>] (mmc_queue_thread) from [<c0152b24>] (kthread+0xdc/0xf4)
[  366.624355] [<c0152b24>] (kthread) from [<c0109038>] (ret_from_fork+0x14/0x3c)
[  366.631576] INFO: task mmcqd/2boot1:127 blocked for more than 120 seconds.
[  366.638439]       Not tainted 4.9.0-m2u+ #3
[  366.642627] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  366.650444] mmcqd/2boot1    D    0   127      2 0x00000000
[  366.655956] [<c099bc0c>] (__schedule) from [<c099bfe0>] (schedule+0x44/0x9c)
[  366.663007] [<c099bfe0>] (schedule) from [<c07d4180>] (__mmc_claim_host+0x98/0x1b8)
[  366.670658] [<c07d4180>] (__mmc_claim_host) from [<c07e69ec>] (mmc_blk_issue_rq+0x2cc/0x570)
[  366.679100] [<c07e69ec>] (mmc_blk_issue_rq) from [<c07e6d7c>] (mmc_queue_thread+0xec/0x19c)
[  366.687453] [<c07e6d7c>] (mmc_queue_thread) from [<c0152b24>] (kthread+0xdc/0xf4)
[  366.694944] [<c0152b24>] (kthread) from [<c0109038>] (ret_from_fork+0x14/0x3c)
[  366.702175] INFO: task systemd-udevd:167 blocked for more than 120 seconds.
[  366.709125]       Not tainted 4.9.0-m2u+ #3
[  366.713315] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  366.721143] systemd-udevd   D    0   167    163 0x00000005
[  366.726641] [<c099bc0c>] (__schedule) from [<c099bfe0>] (schedule+0x44/0x9c)
[  366.733700] [<c099bfe0>] (schedule) from [<c099ec54>] (schedule_timeout+0x1e4/0x22c)
[  366.741452] [<c099ec54>] (schedule_timeout) from [<c099ba04>] (io_schedule_timeout+0x7c/0xb4)
[  366.749969] [<c099ba04>] (io_schedule_timeout) from [<c099c7b8>] (bit_wait_io+0x10/0x5c)
[  366.758066] [<c099c7b8>] (bit_wait_io) from [<c099c688>] (__wait_on_bit_lock+0x70/0xbc)
[  366.766077] [<c099c688>] (__wait_on_bit_lock) from [<c01e3398>] (__lock_page+0x78/0x80)
[  366.774090] [<c01e3398>] (__lock_page) from [<c01f47ac>] (truncate_inode_pages_range+0x358/0x5bc)
[  366.782969] [<c01f47ac>] (truncate_inode_pages_range) from [<c01f4a28>] (truncate_inode_pages+0x18/0x20)
[  366.792456] [<c01f4a28>] (truncate_inode_pages) from [<c0270714>] (__blkdev_put+0x98/0x2ec)
[  366.800814] [<c0270714>] (__blkdev_put) from [<c0270e64>] (blkdev_close+0x18/0x20)
[  366.808380] [<c0270e64>] (blkdev_close) from [<c023bcb0>] (__fput+0x84/0x1cc)
[  366.815528] [<c023bcb0>] (__fput) from [<c015124c>] (task_work_run+0xb8/0xdc)
[  366.822677] [<c015124c>] (task_work_run) from [<c013a310>] (do_exit+0x328/0x9d8)
[  366.830069] [<c013a310>] (do_exit) from [<c013aa28>] (do_group_exit+0x3c/0xd0)
[  366.837304] [<c013aa28>] (do_group_exit) from [<c0144414>] (get_signal+0x28c/0x5cc)
[  366.844970] [<c0144414>] (get_signal) from [<c010c4e8>] (do_signal+0xc4/0x418)
[  366.852201] [<c010c4e8>] (do_signal) from [<c010c9ec>] (do_work_pending+0xa0/0xb8)
[  366.859777] [<c010c9ec>] (do_work_pending) from [<c0108fd4>] (slow_work_pending+0xc/0x20)