itop-4412开发板出厂前首次烧写后，屏幕只发暗光，进不去主界面

Leo丶

开发板出厂前首次烧写后，启动开发板进入uboot界面，打印信息如下：
OK
  
U-Boot 2010.03 (Mar 19 2018 - 23:53:22) for iTOP-4412 Android
                                                            
        APLL = 1000MHz, MPLL = 800MHz
        ARM_CLOCK = 1000MHz         
PMIC:   S5M8767(VER5.0)   
Board:  iTOP-4412      
DRAM:    2 GB   
MMC:   max_emmc_clock:40 MHZ
Set CLK to 400 KHz         
EMMC CLOCK OUTPUT:: 400KHz -[div:50]
response timeout error : 00000104 cmd 8
response timeout error : 00000104 cmd 55
max_emmc_clock:40 MHZ                  
Input CLK [ 50 MHz] is higher than limit [40 MHZ]
Set CLK to 40000 KHz                             
EMMC clock output: 40000 KHz
max_emmc_clock:40 MHZ      
Input CLK [ 50 MHz] is higher than limit [40 MHZ]
Set CLK to 40000 KHz                             
EMMC clock output: 40000 KHz
MMC0:   14910 MB            
SD sclk_mmc is 400K HZ
SD sclk_mmc is 50000K HZ
SD sclk_mmc is 50000K HZ
MMC1:   30510 MB        
*** Warning - using default environment
                                       
In:    serial
Out:   serial
Err:   serial
eMMC OPEN Success.!!
                        !!!Notice!!!
!You must close eMMC boot Partition after all image writing!
!eMMC boot partition has continuity at image writing time.!
!So, Do not close boot partition, Before, all images is written.!
                                                                 
MMC read: dev # 0, block # 48, count 16 ...16 blocks read: OK
eMMC CLOSE Success.!!                                       
                     

Checking Boot Mode ... EMMC4.41
SYSTEM ENTER NORMAL BOOT MODE  
Hit any key to stop autoboot:  0

这说明emmc启动成功了吧？
不按下任何按键，打印信息如下：
[    4.773925] mmc2: Internal clock never stabilised.
[    4.783346] NET: Registered protocol family 17
[    4.786352] NET: Registered protocol family 15
[    4.790755] can: controller area network core (rev 20090105 abi 8)
[    4.795123] mmc2: Internal clock never stabilised.
[    4.801876] NET: Registered protocol family 29
[    4.806120] can: raw protocol (rev 20090105)
[    4.810473] Bluetooth: RFCOMM TTY layer initialized
[    4.815242] Bluetooth: RFCOMM socket layer initialized
[    4.816305] mmc2: Internal clock never stabilised.
[    4.825240] Bluetooth: RFCOMM ver 1.11
[    4.828849] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    4.834153] Bluetooth: BNEP filters: protocol multicast
[    4.837476] mmc2: Internal clock never stabilised.
[    4.844272] NET: Registered protocol family 35
[    4.848818] EXYNOS4X12: Adaptive Support Voltage init
[    4.853601] EXYNOS4X12(SG):  ORIG : 2 MOD : 0 RESULT : 2
[    4.857659] mmc2: Internal clock never stabilised.
[    4.863779] EXYNOS4X12(SG):  ORIG : 2 MOD : 0 RESULT : 2
[    4.868963] exynos4x12_set_abb:0x0, 0x0, 0x0, 0x0, 0x80000088
[    4.874688] VFP support v0.3:
[    4.877854] mmc2: Internal clock never stabilised.
[    4.882707] implementor 41 architecture 3 part 30 variant 9 rev 4
[    4.888587] Registering SWP/SWPB emulation handler
[    4.893357] DVFS : VDD_ARM Voltage table set with 2 Group
[    4.898732] exynos4x12_volt_table[0]:1375000
[    4.902785] mmc2: Internal clock never stabilised.
[    4.917900] exynos4x12_volt_table[1]:1350000
[    4.920707] exynos4x12_volt_table[2]:1300000
[    4.922969] mmc2: Internal clock never stabilised.
[    4.929851] exynos4x12_volt_table[3]:1275000
[    4.933983] exynos4x12_volt_table[4]:1212500
[    4.938234] exynos4x12_volt_table[5]:1175000
[    4.942487] exynos4x12_volt_table[6]:1162500
[    4.943150] mmc2: Internal clock never stabilised.
[    4.951628] exynos4x12_volt_table[7]:1162500
[    4.955768] exynos4x12_volt_table[8]:1062500
[    4.960021] exynos4x12_volt_table[9]:1037500
[    4.963331] mmc2: Internal clock never stabilised.
[    4.969161] exynos4x12_volt_table[10]:1025000
[    4.973389] exynos4x12_volt_table[11]:1000000
[    4.977728] exynos4x12_volt_table[12]:975000
[    4.981981] exynos4x12_volt_table[13]:975000
[    4.983513] mmc2: Internal clock never stabilised.
[    4.991121] exynos4x12_cpufreq_init:topeet scp
[    4.995814] [ 302612 ] Memory Type Undertermined.
[    5.000131] DVFS : VDD_INT Voltage table set with 2 Group
[    5.010084] *******mmc2: inserted!!!!!******
[    5.060111] *******mmc2: inserted!!!!!******
[    5.080325] exynos4_integrated_dvfs_hotplug_init, max(1400000),min(200000)
[    5.089785] regulator_init_complete: VDD18_MIPI: incomplete constraints, leaving on
[    5.096447] regulator_init_complete: VDD10_MIPI: incomplete constraints, leaving on
[    5.104088] regulator_init_complete: VDD18_2M: incomplete constraints, leaving on
[    5.110148] *******mmc2: inserted!!!!!******
[    5.117112] regulator_init_complete: vdd_int range: incomplete constraints, leaving on
[    5.137816] regulator_init_complete: vdd_arm range: incomplete constraints, leaving on
[    5.144802] regulator_init_complete: vdd_mif range: incomplete constraints, leaving on
[    5.153038] USB_DEVICE_ATTACHED
[    5.156860] exynos_usb_Device: Exynos USB Device Driver
[    5.160662] value1 = 1, value2 = 0, type = 0x2
[    5.170087] ==ft5x0x_ts_init: reset==
[    5.480042] usb 1-3: new high speed USB device number 2 using s5p-ehci
[    5.615423] usb 1-3: New USB device found, idVendor=0424, idProduct=3503, bcdDevice=a1a0
[    5.622070] usb 1-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    5.629333] usb 1-3: New USB device Class: Class=9, SubClass=0, Protocol=2
[    5.638853] hub 1-3:1.0: USB hub found
[    5.641469] hub 1-3:1.0: 3 ports detected
[    5.706619] input: ft5x0x_ts as /devices/virtual/input/input3
[    5.720351] read reg (0xa6) error, -6
[    5.722574] ft5x0x_ts 3-0038: chip not found
[    5.800991] ft5x0x_ts 3-0038: probe ft5x0x TouchScreen failed, -6
[    5.807505] s5m_rtc_read_time: 2012/9/11 13:41:4(2)
[    5.811012] s3c_rtc_settime() 2012-9-11 13:41:4
[    5.815535] s5m_rtc_set_time: 2012/9/11 13:41:4(2)
[    5.845527] s5m-rtc s5m-rtc: setting system clock to 2012-09-11 13:41:04 UTC (1347370864)
[    5.854178] FIMC0 registered successfully
[    5.858123] FIMC1 registered successfully
[    5.862156] FIMC2 registered successfully
[    5.866417] FIMC3 registered successfully
[    5.869749] S5P TVOUT Driver v3.0 (c) 2010 Samsung Electronics
[    5.910283] Freeing init memory: 220K
[    5.923045] init: init.wireless.rc: 136: invalid option 'chmod'
[    5.927969] init: init.wireless.rc: 172: ignored duplicate definition of service 'hfag'
[    5.935477] usb 1-3.2: new high speed USB device number 3 using s5p-ehci
[    5.942329] init: init.wireless.rc: 178: ignored duplicate definition of service 'hsag'
[    5.950408] init: init.wireless.rc: 184: ignored duplicate definition of service 'opush'
[    5.958381] init: init.wireless.rc: 190: ignored duplicate definition of service 'pbap'
[    5.967119] init: /init.smdk4x12.rc: 16: ignored duplicate definition of service 'console'
[    5.975341] init (1): /proc/1/oom_adj is deprecated, please use /proc/1/oom_score_adj instead.
[    6.021325] MFC F/W loaded successfully (size: 360008)
[    6.040867] usb 1-3.2: config 1 interface 0 altsetting 0 endpoint 0x83 has an invalid bInterval 0, changing to 9
[    6.126433] usb 1-3.2: New USB device found, idVendor=0a46, idProduct=9621, bcdDevice=0101
[    6.133340] usb 1-3.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    6.160082] usb 1-3.2: New USB device Class: Class=0, SubClass=0, Protocol=0
[    6.176396] [dm962] Linux Driver = V2.45
[    6.179084] ++++++[dm962]+++++ dm_read_reg() 0x29 0x0a
[    6.185762] ++++++[dm962]+++++ dm_read_reg() 0x28 0x46
[    6.189817] ++++++[dm962]+++++ dm_read_reg() 0x2b 0x96
[    6.194960] ++++++[dm962]+++++ dm_read_reg() 0x2a 0x21
[    6.200316] ++++++[dm962]+++++ dm_read_reg() 0xF2 0x00
[    6.204833] ++++++[dm962]+++++  [Analysis.2] 0xF2, D[7] 0 OK
[    6.210558] ++++++[dm962]+++++  [Analysis.2] 0xF2, D[6] 0 OK
[    6.216162] ++++++[dm962]+++++  [Analysis.2] 0xF2, D[5] 0 EP1: Empty
[    6.222490] ++++++[dm962]+++++  [Analysis.2] 0xF2, D[3] 0 OK
[    6.228135] ++++++[dm962]+++++  [Analysis.2] 0xF2, D[2] 0 OK
[    6.233738] ++++++[dm962]+++++  [Analysis.2] 0xF2, D[1] 0 OK
[    6.239380] ++++++[dm962]+++++  [Analysis.2] 0xF2, D[0] 0 Status: TX buffer 0 pkts
[    6.250386] [dm96] Chk mac addr 00:00:ff:ff:00:00
[    6.253619] [dm96] [00] [00] [ff] [ff] [00] [00]
[    6.258406] [dm96] 9620 tx_fix_mod (DM9_NREV= 2)
[    6.262930] [dm96] Fixme: work around for 9620 mode
[    6.267796] [dm96] Add tx_fixup() debug...
[    6.272271] [dm96] 9620 Mode = 128
[    6.290166] dm9620 1-3.2:1.0: eth0: register 'dm9620' at usb-s5p-ehci-3.2, Davicom DM9620 USB Ethernet, 00:00:ff:ff:00:00
[    6.464725] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[    6.517511] EXT4-fs (mmcblk0p3): warning: checktime reached, running e2fsck is recommended
[    6.526594] EXT4-fs (mmcblk0p3): recovery complete
[    6.531871] EXT4-fs (mmcblk0p3): mounted filesystem with ordered data mode. Opts: discard,noauto_da_alloc,nodelalloc
[    6.577413] EXT4-fs (mmcblk0p4): warning: checktime reached, running e2fsck is recommended
[    6.586548] EXT4-fs (mmcblk0p4): recovery complete
[    6.591844] EXT4-fs (mmcblk0p4): mounted filesystem with ordered data mode. Opts: nomblk_io_submit
[    6.620694] init: cannot find '/system/bin/6620_launcher', disabling '6620_launcher'
[    6.637565] init: cannot find '/system/bin/servicemanager', disabling 'servicemanager'
[    6.644171] init: cannot find '/system/bin/vold', disabling 'vold'
[    6.650401] init: cannot find '/system/bin/netd', disabling 'netd'
[    6.656484] init: cannot find '/system/bin/debuggerd', disabling 'debuggerd'
[    6.663501] init: cannot find '/system/bin/rild', disabling 'ril-daemon'
[    6.670207] init: cannot find '/system/bin/surfaceflinger', disabling 'surfaceflinger'
[    6.678092] init: cannot find '/system/bin/app_process', disabling 'zygote'
[    6.685077] init: cannot find '/system/bin/drmserver', disabling 'drm'
[    6.691610] init: cannot find '/system/bin/mediaserver', disabling 'media'
[    6.698430] init: cannot find '/system/bin/dbus-daemon', disabling 'dbus'
[    6.705191] init: cannot find '/system/bin/installd', disabling 'installd'
[    6.712091] init: cannot find '/system/etc/install-recovery.sh', disabling 'flash_recovery'
[    6.720399] init: cannot find '/system/bin/keystore', disabling 'keystore'
[    6.727220] init: cannot find '/system/bin/hald', disabling 'hald'
[    6.733397] init: cannot find '/system/bin/cfg_audio', disabling 'cfg_audio'
[    6.740456] init: property (null) has no value for writing to /sys/class/android_usb/android0/iManufacturer
[    6.750149] init: property (null) has no value for writing to /sys/class/android_usb/android0/iProduct
[    6.761132] init: cannot find '/system/bin/sh', disabling 'console'
[    6.767159] adb_bind_config
[    6.774966] adb_open
[    6.775772] ADB open:
[    8.164939] CPU1: shutdown
[    8.663947] CPU2: shutdown
[    9.162023] CPU3: shutdown
就一直卡在这里，开发版屏幕进不去主界面，我的是4.3寸屏，不知道如何解决这个问题，如何进入主界面？