There are netcp error on dmesg

Looks like disable CONFIG_IOMMU_SUPPORT can fix this issue

ubuntu@c3n3:~$ cat /proc/version
Linux version 3.13.0-7-keystone (buildd@kishi13) (gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-12ubuntu1) ) #10-Ubuntu SMP Tue Jul 8 11:44:52 UTC 2014
ubuntu@c3n3:~$ dmesg | grep netcp
[ 0.208391] 2090000.netcp: keystone device is coherent
[ 14.882411] keystone-netcp 2090000.netcp: Created interface "eth0"
[ 14.956413] keystone-netcp 2090000.netcp: dma_chan_name nettx0
[ 15.026659] keystone-netcp 2090000.netcp: Created interface "eth1"
[ 15.100659] keystone-netcp 2090000.netcp: dma_chan_name nettx1
[ 21.390816] keystone-netcp 2090000.netcp: initializing cpsw version 1.3 (1) SGMII identification value 0x4ed1
[ 21.391028] keystone-netcp 2090000.netcp: Created a cpsw ale engine
[ 21.541566] keystone-netcp 2090000.netcp: Using Packet Accelerator Firmware version 0x02000105
[ 21.541589] keystone-netcp 2090000.netcp: pa_clk_rate(133333333 HZ),mult(30720),shift(12)
[ 21.661531] net eth0: netcp device eth0 opened
ubuntu@c3n3:~$

This issue is fixed in linux-keystone 3.13.0-7.10

This bug was fixed in the package linux-keystone - 3.13.0-7.11

---------------
linux-keystone (3.13.0-7.11) trusty; urgency=low

  [ Andy Whitcroft ]

  * rebase to Ubuntu-3.13.0-32.57

  [ Ubuntu: 3.13.0-32.57 ]

  * l2tp: Privilege escalation in ppp over l2tp sockets
    - LP: #1341472
    - CVE-2014-4943

linux-keystone (3.13.0-7.10) trusty; urgency=low

  [ Ike Panhc ]

  * Release Tracking Bug
    - LP: #1336849
  * [Config] Disable IOMMU_SUPPORT
    - LP: #1334957
  * [Config] Enable BONDING, EMBEDDED and disable HZ_IDLE and PREEMPT
    - LP: #1337203
  * Rebase to Ubuntu-3.13.0-32.56

  [ Upstream Kernel Changes ]

  * i2c: davinci: Add block read for IPMI integration
    - LP: #1337788

  [ Ubuntu: 3.13.0-32.56 ]

  * Merged back Ubuntu-3.13.0-30.55 security release
  * Revert "x86_64,ptrace: Enforce RIP <= TASK_SIZE_MAX (CVE-2014-4699)"
    - LP: #1337339
  * Release Tracking Bug
    - LP: #1338524
  * ptrace,x86: force IRET path after a ptrace_stop()
    - LP: #1337339
    - CVE-2014-4699
  * hpsa: add new Smart Array PCI IDs (May 2014)
    - LP: #1337516

  [ Ubuntu: 3.13.0-31.55 ]

  * Release Tracking Bug
    - LP: #1336278
  * [Config] switch hyper-keyboard to virtual
    - LP: #1325306
  * [Packaging] linux-udeb-flavour -- standardise on linux prefix
  * [Config] CONFIG_GPIO_DWAPB=m
    - LP: #1334823
  * SAUCE: (no-up) arm64: dts: Add Designware GPIO dts binding to APM
    X-Gene platform
    - LP: #1334823
  * SAUCE: (no-up) apparmor: fix apparmor spams log with warning message
    - LP: #1308761
  * [Config] updateconfigs ACPI_PROCFS_POWER=y after v3.13.11.4 rebase
  * SAUCE: (no-up) phy-xgene: Use correct tuning for Mustang
    - LP: #1335636
  * SAUCE: (no-up) powerpc/perf: Ensure all EBB register state is cleared
    on fork()
    - LP: #1328914
  * Revert "SAUCE: (no-up) rtc: Add X-Gene SoC Real Time Clock Driver"
    - LP: #1274305
  * SAUCE: (no-up) libahci: Implement the function ahci_restart_engine to
    restart the port dma engine.
    - LP: #1335645
  * SAUCE: (no-up) ata: Fix the dma state machine lockup for the IDENTIFY
    DEVICE PIO mode command.
    - LP: #1335645
  * [Config] CONFIG_POWERNV_CPUFREQ=y for powerpc, ppc64el
    - LP: #1324571
  * [Debian] Add UTS_UBUNTU_RELEASE_ABI to utsrelease.h
    - LP: #1327619
  * [Config] CONFIG_HAVE_MEMORYLESS_NODES=y
    - LP: #1332063
  * [Config] CONFIG_HID_RMI=m
    - LP: #1305522
  * Revert "offb: Add palette hack for little endian"
    - LP: #1333430
  * Revert "net: mvneta: fix usage as a module on RGMII configurations"
    - LP: #1333837
  * Revert "USB: serial: add usbid for dell wwan card to sierra.c"
    - LP: #1333837
  * Revert "macvlan : fix checksums error when we are in bridge mode"
    - LP: #1333838
  * serial: uart: add hw flow control support configuration
    - LP: #1328295
  * mm/numa: Remove BUG_ON() in __handle_mm_fault()
    - LP: #1323165
  * Tools: hv: Handle the case when the target file exists correctly
    - LP: #1306215
  * Documentation/devicetree/bindings: add documentation for the APM X-Gene
    SoC RTC DTS binding
    - LP: #1274305
  * drivers/rtc: add APM X-Gene SoC RTC driver
    - LP: #1274305
  * arm64: add APM X-Gene SoC RTC DTS...

The issue has been fixed by disabling CONFIG_IOMMU_SUPPORT of kernel build options. The hdparm utility that appears to require CONFIG_SHMOBILE_IOMMU will be discussed in the thread of 'M.2 FW update issue (LP1338780).'