root后的启动代码如下，供参考：

root@sabresd_6dq:/ # EXT4-fs (mmcblk0p7): re-mounted. Opts: (null)

ERROR: v4l2 capture: slave not found!

ERROR: v4l2 capture: slave not found!

ERROR: v4l2 capture: slave not found!

ERROR: v4l2 capture: slave not found!

ERROR: v4l2 capture: slave not found!

ERROR: v4l2 capture: slave not found!

ERROR: v4l2 capture: slave not found!

ERROR: v4l2 capture: slave not found!

EXT4-fs (mmcblk0p7): re-mounted. Opts: (null)

warning: `zygote' uses 32-bit capabilities (legacy support in use)

request_suspend_state: wakeup (3->0) at 23445312336 (1970-01-02 00:00:12.815642334 UTC)

cpufreq_interactive_input_connect: connect to max11801_ts

mma enable setting active

eth0: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=1:01, irq=-1)

ADDRCONF(NETDEV_UP): eth0: link is not ready

acc_open

acc_release

ehci_fsl_bus_resume begins, Host 1

ehci_fsl_bus_resume ends, Host 1

ehci_fsl_bus_resume begins, DR

ehci_fsl_bus_suspend begins, Host 1

ehci_fsl_bus_suspend ends, Host 1

init: sys_prop: permission denied uid:1003  name:service.bootanim.exit

request_suspend_state: sleep (0->3) at 92603837345 (1970-01-02 00:01:21.974165343 UTC)

mma enable setting inactive

PM: Syncing filesystems ... done.

PM: Preparing system for mem sleep

suspend: start 1 suspend...

suspend: finish 1 suspend after:0.2603000 seconds...

Freezing user space processes ... (elapsed 0.01 seconds) done.

Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.

PM: Entering mem sleep

Suspending console(s) (use no_console_suspend to debug)

USB Host suspend begins

ehci_fsl_drv_suspend, pm event

host suspend ends

udc suspend begins

USB Gadget suspend ends

USB Host suspend begins

ehci_fsl_drv_suspend, pm event

host suspend ends

add wake up source irq 101

add wake up source irq 99

add wake up source irq 103

add wake up source irq 51

PM: suspend of devices complete after 12.320 msecs

PM: late suspend of devices complete after 0.604 msecs

Disabling non-boot CPUs ...

CPU1: shutdown

CPU2: shutdown

CPU3: shutdown

Enabling non-boot CPUs ...

CPU1: Booted secondary processor

Calibrating delay loop (skipped) already calibrated this CPU

i.MXC CPU frequency driver

CPU1 is up

CPU2: Booted secondary processor

Calibrating delay loop (skipped) already calibrated this CPU

i.MXC CPU frequency driver

CPU2 is up

CPU3: Booted secondary processor

Calibrating delay loop (skipped) already calibrated this CPU

i.MXC CPU frequency driver

CPU3 is up

PM: early resume of devices complete after 0.424 msecs

wakeup wake lock: alarm_rtc

imx-ipuv3 imx-ipuv3.0: IPU DMFC DP HIGH RESOLUTION: 1(0,1), 5B(2~5), 5F(6,7)

imx-ipuv3 imx-ipuv3.1: IPU DMFC DP HIGH RESOLUTION: 1(0,1), 5B(2~5), 5F(6,7)

remove wake up source irq 51

remove wake up source irq 103

remove wake up source irq 101

remove wake up source irq 99

ehci fsl drv resume begins: DR

ehci_fsl_drv_resume,pm event, wait for wakeup irq if needed

USB Gadget resume begins

fsl_udc_resume, Wait for wakeup thread finishes

ehci_fsl_bus_resume begins, DR

dr_controller_run: udc enter low power mode

USB Gadget resume ends

ehci fsl drv resume begins: Host 1

ehci_fsl_drv_resume,pm event, wait for wakeup irq if needed

ehci_fsl_bus_resume begins, Host 1

ehci_fsl_bus_resume ends, Host 1

PM: resume of devices complete after 97.620 msecs

PM: Finishing wakeup.

Restarting tasks ... done.

suspend: finish 1 suspend after:3.990689324 seconds...

suspend: exit suspend, ret = 0 (1970-01-02 00:01:26.212731333 UTC)

PM: Syncing filesystems ... done.

PM: Preparing system for mem sleep

suspend: start 2 suspend...

suspend: finish 2 suspend after:0.2603333 seconds...

Freezing user space processes ... (elapsed 0.01 seconds) done.

Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.

PM: Entering mem sleep

Suspending console(s) (use no_console_suspend to debug)

pm_op(): platform_pm_suspend+0x0/0x5c returns -16

PM: Device alarm failed to suspend: error -16

PM: Some devices failed to suspend

PM: resume of devices complete after 0.546 msecs

PM: Finishing wakeup.

Restarting tasks ... done.

suspend: finish 2 suspend after:0.88187332 seconds...

suspend: exit suspend, ret = -16 (1970-01-02 00:01:27.041896666 UTC)

mmc0: Starting deferred resume

mmc0: Deferred resume completed

PM: Syncing filesystems ... done.

PM: Preparing system for mem sleep

suspend: start 3 suspend...

suspend: finish 3 suspend after:0.2659000 seconds...

Freezing user space processes ... (elapsed 0.02 seconds) done.

Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.

PM: Entering mem sleep

Suspending console(s) (use no_console_suspend to debug)

。。。。。。