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[Bug 1366867] Re: PC is at ahci_enable_ahci+0x14/0x6c [libahci]

 

dannf, can you point me in the right direction to do the firmware update
that you did?  APM doesn't appear to make their firmwares available
online (at least not to me anyway), and they're completely unresponsive
to support requests.  Also, anything you can tell me about applying the
update would be appreciated. I've never done this before.

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https://bugs.launchpad.net/bugs/1366867

Title:
   PC is at ahci_enable_ahci+0x14/0x6c [libahci]

Status in linux package in Ubuntu:
  Invalid

Bug description:
  When attempting to use the 1.12.10 firmware with linux kernel versions
  3.13.0-36.63 and above the system will not boot.

  SATA1 link 0 timeout
  SATA1 link 1 timeout
  AHCI1 0001.0300 32 slots 2 ports 6 Gbps 0x3 impl SATA mode
  flags: 64bit ncq pm only pmp fbss pio slum part ccc apst boh 
  SATA2 spinup took 0 ms.
  SATA2 link 1 timeout
  AHCI2 0001.0300 32 slots 2 ports 6 Gbps 0x3 impl SATA mode
  flags: 64bit ncq pm only pmp fbss pio slum part ccc apst boh 
  scanning bus for devices...
    Device 0: (4:0) Vendor: ATA Prod.: ST500DM002-1BD14 Rev: KC45
              Type: Hard Disk
              Capacity: 476940.0 MB = 465.7 GB (976773168 x 512)
  Found 1 device(s).
  300 bytes read in 65 ms (3.9 KiB/s)
  ## Executing script at 4004000000
  9361408 bytes read in 322 ms (27.7 MiB/s)
  17697693 bytes read in 496 ms (34 MiB/s)
  12756 bytes read in 53 ms (234.4 KiB/s)
  ## Booting kernel from Legacy Image at 4002000000 ...
     Image Name:   kernel 3.13.0-36-generic
     Image Type:   ARM Linux Kernel Image (uncompressed)
     Data Size:    9361344 Bytes = 8.9 MiB
     Load Address: 00080000
     Entry Point:  00080000
     Verifying Checksum ... OK
  ## Loading init Ramdisk from Legacy Image at 4004000000 ...
     Image Name:   ramdisk 3.13.0-36-generic
     Image Type:   ARM Linux RAMDisk Image (gzip compressed)
     Data Size:    17697629 Bytes = 16.9 MiB
     Load Address: 00000000
     Entry Point:  00000000
     Verifying Checksum ... OK
  ## Flattened Device Tree blob at 4003000000
     Booting using the fdt blob at 0x0000004003000000
     Loading Kernel Image ... OK
  OK
     Loading Ramdisk to 43def1f000, end 43dffffb5d ... OK
     Loading Device Tree to 0000004000ff9000, end 0000004000fff1d3 ... OK

  Starting kernel ...

  L3C: 8MB
  [    0.000000] Initializing cgroup subsys cpuset
  [    0.000000] Initializing cgroup subsys cpu
  [    0.000000] Initializing cgroup subsys cpuacct
  [    0.000000] Linux version 3.13.0-36-generic (buildd@magic) (gcc version 4.8.2 (Ubuntu/Linaro 4.8.2-19ubuntu1) ) #63-Ubuntu SMP Wed Sep 3 21:33:11 UTC 2014 (Ubuntu 3.13.0-36.63-generic 3.13.11.6)
  [    0.000000] CPU: AArch64 Processor [500f0000] revision 0
  [    0.000000] PERCPU: Embedded 12 pages/cpu @ffffffc3fff79000 s17024 r8192 d23936 u49152
  [    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 4136960
  [    0.000000] Kernel command line: console=ttyS0,115200n8 ro
  [    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
  [    0.000000] Dentry cache hash table entries: 2097152 (order: 12, 16777216 bytes)
  [    0.000000] Inode-cache hash table entries: 1048576 (order: 11, 8388608 bytes)
  [    0.000000] software IO TLB [mem 0x43ec600000-0x43f0600000] (64MB) mapped at [ffffffc3ec600000-ffffffc3f05fffff]
  [    0.000000] Memory: 16429604K/16777216K available (5710K kernel code, 581K rwdata, 2536K rodata, 304K init, 538K bss, 347612K reserved)
  [    0.000000] Virtual kernel memory layout:
  [    0.000000]     vmalloc : 0xffffff8000000000 - 0xffffffbbffff0000   (245759 MB)
  [    0.000000]     vmemmap : 0xffffffbce0000000 - 0xffffffbcee000000   (   224 MB)
  [    0.000000]     modules : 0xffffffbffc000000 - 0xffffffc000000000   (    64 MB)
  [    0.000000]     memory  : 0xffffffc000000000 - 0xffffffc400000000   ( 16384 MB)
  [    0.000000]       .init : 0xffffffc00088f000 - 0xffffffc0008db280   (   305 kB)
  [    0.000000]       .text : 0xffffffc000080000 - 0xffffffc00088e984   (  8251 kB)
  [    0.000000]       .data : 0xffffffc0008dc000 - 0xffffffc00096d7c0   (   582 kB)
  [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=8, Nodes=1
  [    0.000000] Hierarchical RCU implementation.
  [    0.000000] 	RCU dyntick-idle grace-period acceleration is enabled.
  [    0.000000] NR_IRQS:64 nr_irqs:64 0
  [    0.000000] Architected cp15 timer(s) running at 50.00MHz (phys).
  [    0.000000] sched_clock: 56 bits at 50MHz, resolution 20ns, wraps every 2748779069440ns
  [    0.000000] Console: colour dummy device 80x25
  [    0.000000] allocated 67108864 bytes of page_cgroup
  [    0.000000] please try 'cgroup_disable=memory' option if you don't want memory cgroups
  [    0.003078] Calibrating delay loop (skipped), value calculated using timer frequency.. 100.00 BogoMIPS (lpj=500000)
  [    0.003083] pid_max: default: 32768 minimum: 301
  [    0.003125] Security Framework initialized
  [    0.003160] AppArmor: AppArmor initialized
  [    0.003163] Yama: becoming mindful.
  [    0.003196] Mount-cache hash table entries: 32768 (order: 6, 262144 bytes)
  [    0.003200] Mountpoint-cache hash table entries: 32768 (order: 6, 262144 bytes)
  [    0.004166] Initializing cgroup subsys memory
  [    0.004177] Initializing cgroup subsys devices
  [    0.004180] Initializing cgroup subsys freezer
  [    0.004183] Initializing cgroup subsys blkio
  [    0.004186] Initializing cgroup subsys perf_event
  [    0.004191] Initializing cgroup subsys hugetlb
  [    0.004308] hw perfevents: enabled with arm/armv8-pmuv3 PMU driver, 5 counters available
  [    0.005593] CPU1: Booted secondary processor
  [    0.006201] CPU2: Booted secondary processor
  [    0.006794] CPU3: Booted secondary processor
  [    0.007390] CPU4: Booted secondary processor
  [    0.007978] CPU5: Booted secondary processor
  [    0.008572] CPU6: Booted secondary processor
  [    0.009161] CPU7: Booted secondary processor
  [    0.009207] Brought up 8 CPUs
  [    0.009216] SMP: Total of 8 processors activated.
  [    0.009453] devtmpfs: initialized
  [    0.011069] EVM: security.selinux
  [    0.011073] EVM: security.SMACK64
  [    0.011074] EVM: security.ima
  [    0.011076] EVM: security.capability
  [    0.011366] atomic64 test passed
  [    0.011454] regulator-dummy: no parameters
  [    0.011551] NET: Registered protocol family 16
  [    0.012003] syscon 17000000.system-clk-controller: regmap [mem 0x17000000-0x170003ff] registered
  [    0.012320] vdso: 2 pages (1 code, 1 data) at base ffffffc0008e1000
  [    0.012335] hw-breakpoint: found 4 breakpoint and 4 watchpoint registers.
  [    0.012409] Serial: AMBA PL011 UART driver
  [    0.013464] bio: create slab <bio-0> at 0
  [    0.013764] vgaarb: loaded
  [    0.014011] SCSI subsystem initialized
  [    0.014372] NetLabel: Initializing
  [    0.014375] NetLabel:  domain hash size = 128
  [    0.014377] NetLabel:  protocols = UNLABELED CIPSOv4
  [    0.014396] NetLabel:  unlabeled traffic allowed by default
  [    0.014518] XGene: PCIe MSI driver v0.1
  [    0.014566] Switched to clocksource arch_sys_counter
  [    0.018420] AppArmor: AppArmor Filesystem Enabled
  [    0.020054] NET: Registered protocol family 2
  [    0.020283] TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
  [    0.020621] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
  [    0.020987] TCP: Hash tables configured (established 131072 bind 65536)
  [    0.021009] TCP: reno registered
  [    0.021016] UDP hash table entries: 8192 (order: 6, 262144 bytes)
  [    0.021153] UDP-Lite hash table entries: 8192 (order: 6, 262144 bytes)
  [    0.021389] NET: Registered protocol family 1
  [    0.021484] Trying to unpack rootfs image as initramfs...
  [    0.389211] Freeing initrd memory: 17280K (ffffffc3def1f000 - ffffffc3dffff000)
  [    0.389320] kvm [1]: Using HYP init bounce page @43e781d000
  [    0.389402] kvm [1]: interrupt-controller@78040000 IRQ25
  [    0.389510] kvm [1]: timer IRQ30
  [    0.389519] kvm [1]: Hyp mode initialized successfully
  [    0.389805] Initialise system trusted keyring
  [    0.389846] audit: initializing netlink socket (disabled)
  [    0.389872] type=2000 audit(0.380:1): initialized
  [    0.390254] HugeTLB registered 2 MB page size, pre-allocated 0 pages
  [    0.391345] zbud: loaded
  [    0.391548] VFS: Disk quotas dquot_6.5.2
  [    0.391614] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
  [    0.392368] fuse init (API version 7.22)
  [    0.392469] msgmni has been set to 32122
  [    0.392552] Key type big_key registered
  [    0.392849] Key type asymmetric registered
  [    0.392853] Asymmetric key parser 'x509' registered
  [    0.392908] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
  [    0.392951] io scheduler noop registered
  [    0.392954] io scheduler deadline registered (default)
  [    0.392997] io scheduler cfq registered
  [    0.414587] xgene-pcie 1f2b0000.pcie: (rc) x1 gen-1 link up
  [    0.414624] PCI host bridge to bus 0000:00
  [    0.414629] pci_bus 0000:00: root bus resource [io  0x0000-0x10000]
  [    0.414634] pci_bus 0000:00: root bus resource [mem 0xe010000000-0xe08fffffff] (bus address [0x10000000-0x8fffffff])
  [    0.414637] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
  [    0.414697] pci 0000:00:00.0: Hiding X-Gene pci host bridge resources 0000:00:00.0
  [    0.414785] PCI: bus0: Fast back to back transfers disabled
  [    0.434597] PCI: bus1: Fast back to back transfers disabled
  [    0.434618] pcieport 0000:00:00.0: device [e008:e004] has invalid IRQ; check vendor BIOS
  [    0.434683] pci 0000:00:00.0: BAR 14: assigned [mem 0xe010000000-0xe0100fffff]
  [    0.434687] pci 0000:01:00.0: BAR 0: assigned [mem 0xe010000000-0xe01000ffff 64bit]
  [    0.434709] pci 0000:00:00.0: PCI bridge to [bus 01]
  [    0.434715] pci 0000:00:00.0:   bridge window [mem 0xe010000000-0xe0100fffff]
  [    0.434793] ipmi message handler version 39.2
  [    0.434905] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
  [    0.435998] 1c020000.serial: ttyS0 at MMIO 0x1c020000 (irq = 108, base_baud = 3125000) is a 16550
  [    1.108508] console [ttyS0] enabled
  [    1.113803] brd: module loaded
  [    1.117789] loop: module loaded
  [    1.121430] libphy: Fixed MDIO Bus: probed
  [    1.125678] tun: Universal TUN/TAP device driver, 1.6
  [    1.130702] tun: (C) 1999-2004 Max Krasnyansky <maxk@xxxxxxxxxxxx>
  [    1.136940] PPP generic driver version 2.4.2
  [    1.141291] mousedev: PS/2 mouse device common for all mice
  [    1.146976] xgene-rtc 10510000.rtc: rtc core: registered 10510000.rtc as rtc0
  [    1.154200] device-mapper: uevent: version 1.0.3
  [    1.158890] device-mapper: ioctl: 4.27.0-ioctl (2013-10-30) initialised: dm-devel@xxxxxxxxxx
  [    1.167312] ledtrig-cpu: registered to indicate activity on CPUs
  [    1.173429] TCP: cubic registered
  [    1.176866] NET: Registered protocol family 10
  [    1.181555] NET: Registered protocol family 17
  [    1.185997] Key type dns_resolver registered
  [    1.190354] Loading compiled-in X.509 certificates
  [    1.196551] Loaded X.509 cert 'Magrathea: Glacier signing key: 6c5f8dca1aa8806babf4b831df0e5e6d34b28228'
  [    1.205998] registered taskstats version 1
  [    1.212688] Key type trusted registered
  [    1.218677] Key type encrypted registered
  [    1.224845] AppArmor: AppArmor sha1 policy hashing enabled
  [    1.230303] IMA: No TPM chip found, activating TPM-bypass!
  [    1.235899] regulator-dummy: disabling
  [    1.239681] xgene-rtc 10510000.rtc: setting system clock to 2014-09-08 15:25:13 UTC (1410189913)
  [    1.248655] Freeing unused kernel memory: 304K (ffffffc00088f000 - ffffffc0008db000)
  Loading, please wait...
  [    1.272454] systemd-udevd[121]: starting version 204
  [    1.284146] pps_core: LinuxPPS API ver. 1 registered
  Be[    1.289109] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@xxxxxxxx>
  g[    1.289234] libphy: APM X-Gene MDIO bus: probed
  in: Loading essential[    1.304661] xgene-ahci 1a400000.sata: dummy supplies not allowed
  [    1.304907] PTP clock support registered
  [    1.308962] tg3.c:v3.134 (Sep 16, 2013)
   d[    1.318482] xgene-ahci 1a400000.sata: skip clock and PHY initialization
  rivers ... done.
  Begin: Running /scripts/init-premount .[    1.330023] tg3 0000:01:00.0 eth1: Tigon3 [partno(BCM95722A2202G) rev a200] (PCI Express) MAC address 00:10:18:55:33:0d
  ..[    1.340861] tg3 0000:01:00.0 eth1: attached PHY is 5722/5756 (10/100/1000Base-T Ethernet) (WireSpeed[1], EEE[0])
   d[    1.351135] tg3 0000:01:00.0 eth1: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
  on[    1.359093] tg3 0000:01:00.0 eth1: dma_rwctrl[76180000] dma_mask[64-bit]
  e.
  Begin: Mounting root file system ... [    1.392179] Unhandled fault: synchronous external abort (0x96000010) at 0xffffff800003c004
  Be[    1.400415] Internal error: : 96000010 [#1] SMP
  gi[    1.405095] Modules linked in:n:tg3  ptpR ahci_xgene(+)u ahci_platform libahcinnxgene_eneti pps_coreng
                                                                                                              /[    1.414522] CPU: 3 PID: 130 Comm: systemd-udevd Not tainted 3.13.0-36-generic #63-Ubuntu
  sc[    1.422738] task: ffffffc3df44cd00 ti: ffffffc3df54c000 task.ti: ffffffc3df54c000
  ri[    1.430356] PC is at ahci_enable_ahci+0x14/0x6c [libahci]
  pt[    1.435894] LR is at ahci_save_initial_config+0x34/0x2b4 [libahci]
  s/[    1.442210] pc : [<ffffffbffc01265c>] lr : [<ffffffbffc0126e8>] pstate: 20000145
  lo    1.449736] sp : ffffffc3df54f910
  ca    1.453116] x29: ffffffc3df54f910 lx28: 00000000000000a7 
  -t[    1.458592] x27: ffffffc3df54fdf0 ox26: 0000000000000000 
  p [    1.464151] x25: 0000000000000000 x24: 0000000000000000 ..
                                                                 .     1.469711] x23: ffffffc3ec34dc10 dx22: ffffff800003c000 
  on[    1.475186] x21: ffffff800003c004 x20: ffffffc3df943198 e.
  [    1.480747] x19: ffffffc3df54fa18 
                                       x18: 0000007fdf4d3480 
  [    1.486223] x17: 0000007f8d949980 x16: 0000000000000006 
  [    1.491527] x15: 0000000000000006 x14: 0000000000000000 
  [    1.496830] x13: 0000000000001180 x12: 00000000000001d6 
  [    1.502133] x11: ffffffc3e54fbf00 x10: ffffffc3e54fbf00 
  [    1.507438] x9 : ffffffc3df54f6c0 x8 : ffffffc3df44d210 
  [    1.512740] x7 : 00000000000001d5 x6 : ffffffc00036800c 
  [    1.518042] x5 : ffffffc3ebc007f8 x4 : 0000000000000000 
  [    1.523344] x3 : 0000000000000000 x2 : 0000000000000000 
  [    1.528649] x1 : ffffffc3df943198 x0 : ffffff800003c000 
  [    1.533952] 
  [    1.535433] Process systemd-udevd (pid: 130, stack limit = 0xffffffc3df54c058)
  [    1.542616] Stack: (0xffffffc3df54f910 to 0xffffffc3df550000)
  [    1.548332] f900:                                     df54f940 ffffffc3 fc0126e8 ffffffbf
  [    1.556468] f920: df54fa18 ffffffc3 df943198 ffffffc3 ec34dc00 ffffffc3 00409dfc ffffffc0
  [    1.564602] f940: df54f990 ffffffc3 fc02a444 ffffffbf df54fa18 ffffffc3 ec34dc10 ffffffc3
  [    1.572736] f960: ec34dc00 ffffffc3 ec34dc00 ffffffc3 df943198 ffffffc3 008f6a70 ffffffc0
  [    1.580872] f980: 00000003 00000000 0096d000 ffffffc0 df54fa50 ffffffc3 fc031894 ffffffbf
  [    1.589006] f9a0: ec34dc10 ffffffc3 0096d000 ffffffc0 ec34dc00 ffffffc3 df943198 ffffffc3
  [    1.597140] f9c0: fc032000 ffffffbf 008f6a70 ffffffc0 00000003 00000000 00000000 00000000
  [    1.605274] f9e0: df54fdf0 ffffffc3 008f6000 ffffffc0 00000000 00000000 00000000 00000000
  [    1.613409] fa00: df54fa50 ffffffc3 df54fa18 ffffffc3 00000000 00000000 00060082 00000000
  [    1.621543] fa20: 00000000 00000000 0000001f 00000000 00000000 00000000 0000007f 00000000
  [    1.629678] fa40: fc031eb0 ffffffbf 00000041 00000000 df54fac0 ffffffc3 0040a3e8 ffffffc0
  [    1.637813] fa60: ec34dc10 ffffffc3 fc031e00 ffffffbf 00969000 ffffffc0 00000000 00000000
  [    1.645947] fa80: fc031e28 ffffffbf 008f6a70 ffffffc0 00000003 00000000 00000000 00000000
  [    1.654081] faa0: df54fdf0 ffffffc3 008f6000 ffffffc0 df54fae0 ffffffc3 004089ac ffffffc0
  [    1.662217] fac0: df54fae0 ffffffc3 004089c4 ffffffc0 ec34dc10 ffffffc3 009df000 ffffffc0
  [    1.670351] fae0: df54fb30 ffffffc3 00408dbc ffffffc0 ec34dc10 ffffffc3 fc031e28 ffffffbf
  [    1.678486] fb00: ec34dc70 ffffffc3 00000000 00000000 00928000 ffffffc0 008f6a70 ffffffc0
  [    1.686621] fb20: 00000000 00000000 00406b94 ffffffc0 df54fb60 ffffffc3 00406b88 ffffffc0
  [    1.694756] fb40: 00000000 00000000 fc031e28 ffffffbf 00408d20 ffffffc0 008f6a70 ffffffc0
  [    1.702890] fb60: df54fba0 ffffffc3 00408428 ffffffc0 fc031e28 ffffffbf df95a0c0 ffffffc3
  [    1.711026] fb80: 00928570 ffffffc0 df95a128 ffffffc3 ec2a16a8 ffffffc3 ec339968 ffffffc3
  [    1.719160] fba0: df54fbb0 ffffffc3 0040801c ffffffc0 df54fbf0 ffffffc3 004091e0 ffffffc0
  [    1.727294] fbc0: fc031e28 ffffffbf 00000000 00000000 00000000 00000000 008f6a58 ffffffc0
  [    1.735428] fbe0: fc032188 ffffffbf 00000000 00000000 df54fc20 ffffffc3 0040a3bc ffffffc0
  [    1.743562] fc00: df54c000 ffffffc3 00000000 00000000 fc034000 ffffffbf 00000000 00000000
  [    1.751696] fc20: df54fc30 ffffffc3 fc03401c ffffffbf df54fc40 ffffffc3 000813fc ffffffc0
  [    1.759830] fc40: df54fcc0 ffffffc3 0010bb58 ffffffc0 df54c000 ffffffc3 fc0321a0 ffffffbf
  [    1.767964] fc60: 00000000 00000000 008f6a58 ffffffc0 fc032188 ffffffbf 008f6a70 ffffffc0
  [    1.776099] fc80: df54c000 ffffffc3 fc0321a0 ffffffbf 00000000 00000000 ffffffff 00000000
  [    1.784233] fca0: fc032188 ffffffbf 00000001 00000000 df54fcc0 ffffffc3 0010bb4c ffffffc0
  [    1.792368] fcc0: df54fe40 ffffffc3 0010c058 ffffffc0 00000000 00000000 00000005 00000000
  [    1.800502] fce0: 8daba948 0000007f 8d945ed4 0000007f 60000000 00000000 00000015 00000000
  [    1.808638] fd00: 00000112 00000000 00000111 00000000 008ec000 ffffffc0 df54c000 ffffffc3
  [    1.816773] fd20: fc034028 ffffffbf 00000018 00000000 00000072 00000000 0000006e 00000000
  [    1.824908] fd40: 007c7f78 ffffffc0 0000003f 00000000 0000feff 00000000 0000fff1 00000000
  [    1.833043] fd60: fc0323c0 ffffffbf df54fde0 ffffffc3 009648a0 ffffffc0 00964620 ffffffc0
  [    1.841177] fd80: df54fec4 ffffffc3 df54fe80 ffffffc3 fc034028 ffffffbf 008f6af0 ffffffc0
  [    1.849311] fda0: 00000000 00000000 00000005 00000000 0096e908 ffffffc0 00000000 00000000
  [    1.857447] fdc0: 60000000 00000000 00000015 00000000 8daba948 0000007f 00000cfd 00000000
  [    1.865581] fde0: 00000002 000081a4 00000001 00000000 00000000 00000000 00000000 00000000
  [    1.873715] fe00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  [    1.881850] fe20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  [    1.889984] fe40: df4d4660 0000007f 000849ec ffffffc0 2ac29d30 00000000 2ac31130 00000000
  [    1.898119] fe60: ffffffff ffffffff 2ac29eb0 00000000 009a6000 ffffff80 00003f78 00000000
  [    1.906254] fe80: 009a7ef8 ffffff80 009a7e18 ffffff80 009a8df0 ffffff80 000013c0 00000000
  [    1.914388] fea0: 000016a8 00000000 fc032098 ffffffbf 00000006 00000001 00000017 00000018
  [    1.922522] fec0: 00000010 0000000b 00000009 00000000 00000005 00000000 8daba948 0000007f
  [    1.930658] fee0: 00000000 00000000 00000005 00000000 00000000 00000000 00000000 00000000
  [    1.938792] ff00: 00000000 00000000 00000000 00000000 00000111 00000000 6dff646d 724d3965
  [    1.946926] ff20: 2ac29d90 00000000 0000000a 00000000 00000010 00000000 00000400 00000000
  [    1.955060] ff40: 2e6d726f 6b206f6b 8d9c7590 0000007f 8dacd1d0 0000007f 8d945eb0 0000007f
  [    1.963194] ff60: df4d43a0 0000007f 2ac29d30 00000000 2ac31130 00000000 8daba948 0000007f
  [    1.971329] ff80: 2ac29eb0 00000000 00020000 00000000 2ac29860 00000000 00020000 00000000
  [    1.979464] ffa0: 00000000 00000000 00000000 00000000 00000000 00000000 df4d4660 0000007f
  [    1.987598] ffc0: 8dab43b0 0000007f df4d4660 0000007f 8d945ed4 0000007f 60000000 00000000
  [    1.995734] ffe0: 00000005 00000000 00000111 00000000 00000000 00000000 00000000 00000000
  [    2.003866] Call trace:
  [    2.006302] [<ffffffbffc01265c>] ahci_enable_ahci+0x14/0x6c [libahci]
  [    2.012709] [<ffffffbffc0126e4>] ahci_save_initial_config+0x30/0x2b4 [libahci]
  [    2.019895] [<ffffffbffc02a440>] ahci_platform_init_host+0x98/0x27c [ahci_platform]
  [    2.027512] [<ffffffbffc031890>] xgene_ahci_probe+0x550/0x670 [ahci_xgene]
  [    2.034354] [<ffffffc00040a3e4>] platform_drv_probe+0x20/0x58
  [    2.040069] [<ffffffc0004089c0>] driver_probe_device+0x94/0x3a0
  [    2.045957] [<ffffffc000408db8>] __driver_attach+0x98/0xa0
  [    2.051414] [<ffffffc000406b84>] bus_for_each_dev+0x54/0x98
  [    2.056956] [<ffffffc000408424>] driver_attach+0x1c/0x28
  [    2.062238] [<ffffffc000408018>] bus_add_driver+0x164/0x240
  [    2.067781] [<ffffffc0004091dc>] driver_register+0x64/0x130
  [    2.073323] [<ffffffc00040a3b8>] __platform_driver_register+0x5c/0x68
  [    2.079730] [<ffffffbffc034018>] $x+0x18/0x24 [ahci_xgene]
  [    2.085187] [<ffffffc0000813f8>] do_one_initcall+0xc4/0x150
  [    2.090729] [<ffffffc00010bb54>] load_module+0xedc/0x1230
  [    2.096099] [<ffffffc00010c054>] SyS_finit_module+0x8c/0xb8
  [    2.101641] Code: 910003fd f90013f5 a90153f3 91001015 (b94002b3) 
  [    2.107715] ---[ end trace a47013cf3fde71df ]---
  Gave up waiting for root device.  Common problems:
   - Boot args (cat /proc/cmdline)
     - Check rootdelay= (did the system wait long enough?)
     - Check root= (did the system wait for the right device?)
   - Missing modules (cat /proc/modules; ls /dev)
  ALERT!  /dev/sda2 does not exist.  Dropping to a shell!

  
  BusyBox v1.21.1 (Ubuntu 1:1.21.0-1ubuntu1) built-in shell (ash)
  Enter 'help' for a list of built-in commands.

  (initramfs)

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References