串口按鍵無反應

我剛拿到E9_V2卡版電腦, 沒有買觸控屏, 所以外接HDMI. 由於開機HDMI無輸出畫面, 所以接上串口欲修改內省輸出為HDMI. 開機後在SecureCRT上可以看到顯示訊息提示按鍵中斷開機, 但是不論怎麼按都沒有反應, 因此無法修改輸出, 串口是透過跳線接到Serial轉USB Debug Board上, 電子訊號量測是有接通的, 顯示也正常, 但就是無法輸入按鍵控制, 下面是顯示的部份訊息, 求救!!!
*** Warning - bad CRC or MMC, using default environment


##### EmbedSky BIOS for E9 #####
Hit any key to stop autoboot:  0
kernel   @ 10808000 (5074840)
ramdisk  @ 11800000 (242678)
kernel cmdline:
        use uboot command line:
        console=ttySAC0,115200 init=/init video=mxcfb0:dev=lcd,CLAA-WVGA,if=RGB24,bpp=32 video=mxcfb1:off video=mxcfb2:off fbmem=48M vmalloc=400M androidboot.console=ttySAC0 androidboot.hardware=freescale

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Initializing cgroup subsys cpu
Linux version 3.0.35 (qingleqq@z) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #2 SMP PREEMPT Wed Jun 10 09:31:02 HKT 2015
CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d
CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: Freescale i.MX 6Quad/DualLite/Solo Sabre-SD Board
Ignoring unrecognised tag 0x54410008
Memory policy: ECC disabled, Data cache writealloc
CPU identified as i.MX6Q, silicon rev 1.2
PERCPU: Embedded 7 pages/cpu @c2849000 s6528 r8192 d13952 u32768
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 458496
Kernel command line: console=ttySAC0,115200 init=/init video=mxcfb0:dev=lcd,CLAA-WVGA,if=RGB24,bpp=32 video=mxcfb1:off video=mxcfb2:off fbmem=48M vmalloc=400M androidboot.console=ttySAC0 androidboot.hardware=freescale
PID hash table entries: 2048 (order: 1, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 767MB 800MB 240MB = 1807MB total
Memory: 1821440k/1821440k available, 275712k reserved, 1440768K highmem
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    DMA     : 0xfbe00000 - 0xffe00000   (  64 MB)
    vmalloc : 0xd9800000 - 0xf2000000   ( 392 MB)
    lowmem  : 0xc0000000 - 0xd9000000   ( 400 MB)
    pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
    modules : 0xbf000000 - 0xbfe00000   (  14 MB)
      .init : 0xc0008000 - 0xc0043000   ( 236 kB)
      .text : 0xc0043000 - 0xc0972ccc   (9408 kB)
      .data : 0xc0974000 - 0xc09fa6d0   ( 538 kB)
       .bss : 0xc09fa6f4 - 0xc0b73770   (1509 kB)
Preemptible hierarchical RCU implementation.
NR_IRQS:624
MXC GPIO hardware
sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655ms
arm_max_freq=1GHz
...
...
...
usbcore: registered new interface driver uvcvideo
USB Video Class driver (v1.1.0)
i2c-core: driver [mag3110] using legacy suspend method
i2c-core: driver [mag3110] using legacy resume method
imx2-wdt imx2-wdt.0: IMX2+ Watchdog Timer enabled. timeout=60s (nowayout=1)
device-mapper: uevent: version 1.0.3
device-mapper: ioctl: 4.20.0-ioctl (2011-02-02) initialised: dm-devel@redhat.com
Bluetooth: Virtual HCI driver ver 1.3
USB Gadget resume begins
fsl_udc_resume, Wait for wakeup thread finishes
Bluetooth: HCI UART driver ver 2.2
Bluetooth: HCIATH3K protocol initialized
Bluetooth: Generic Bluetooth USB driver ver 0.6
usbcore: registered new interface driver btusb
cpuidle: using governor ladder
cpuidle: using governor menu
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
mmc0: SDHCI controller on platform [sdhci-esdhc-imx.3] using DMA
mmc1: SDHCI controller on platform [sdhci-esdhc-imx.1] using DMA
sdhci sdhci-esdhc-imx.2: no write-protect pin available!
sdhci sdhci-esdhc-imx.2: no card-detect pin available!
mmc2: SDHCI controller on platform [sdhci-esdhc-imx.2] using DMA
mxc_vdoa mxc_vdoa: i.MX Video Data Order Adapter(VDOA) driver probed
VPU initialized
mxc_asrc registered
Galcore version 4.6.9.9754
revserved_memory_account:viv_gpu registerd
Thermal calibration data is 0x5634dc69
Thermal sensor with ratio = 177
Anatop Thermal registered as thermal_zone0
anatop_thermal_probe: default cooling device is cpufreq!
Registered led device: chg_now_led
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
logger: created 256K log 'log_main'
logger: created 256K log 'log_events'
logger: created 256K log 'log_radio'
logger: created 256K log 'log_system'
usbcore: registered new interface driver snd-usb-audio
mxc_hdmi_soc mxc_hdmi_soc.0: MXC HDMI Audio
imx-hdmi-soc-dai imx-hdmi-soc-dai.0: Failed: Load HDMI-video first.
mmc0: new high speed DDR MMC card at address 0001
mmcblk0: mmc0:0001 008G92 7.28 GiB
mmcblk0boot0: mmc0:0001 008G92 partition 1 4.00 MiB
mmcblk0boot1: mmc0:0001 008G92 partition 2 4.00 MiB
mmcblk0: p1 p2 p3 < p5 p6 p7 p8 p9 > p4
asoc: wm8960-hifi <-> imx-ssi.1 mapping ok
mmcblk0boot1: unknown partition table
input: wm8960-audio Mic Jack as /devices/platform/soc-audio.5/sound/card0/input2
input: wm8960-audio Headphone Jack as /devices/platform/soc-audio.5/sound/card0/input3
mmcblk0boot0: unknown partition table
Initialize HDMI-audio failed. Load HDMI-video first!
ALSA device list:
  #0: wm8960-audio
oprofile: using arm/armv7-ca9
GACT probability NOT on
Mirror/redirect action on
u32 classifier
    Actions configured
Netfilter messages via NETLINK v0.30.
nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
ctnetlink v0.93: registering with nfnetlink.
NF_TPROXY: Transparent proxy support initialized, version 4.1.0
NF_TPROXY: Copyright (c) 2006-2007 BalaBit IT Ltd.
xt_time: kernel timezone is -0000
IPv4 over IPv4 tunneling driver
GRE over IPv4 demultiplexor driver
ip_tables: (C) 2000-2006 Netfilter Core Team
arp_tables: (C) 2002 David S. Miller
TCP cubic registered
NET: Registered protocol family 10
Mobile IPv6
ip6_tables: (C) 2000-2006 Netfilter Core Team
IPv6 over IPv4 tunneling driver
NET: Registered protocol family 17
NET: Registered protocol family 15
can: controller area network core (rev 20090105 abi 8)
NET: Registered protocol family 29
can: raw protocol (rev 20090105)
can: broadcast manager protocol (rev 20090105 t)
Bluetooth: RFCOMM TTY layer initialized
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM ver 1.11
Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Bluetooth: BNEP filters: protocol multicast
Bluetooth: HIDP (Human Interface Emulation) ver 1.2
L2TP core driver, V2.0
PPPoL2TP kernel driver, V2.0
L2TP IP encapsulation support (L2TPv3)
L2TP netlink interface
L2TP ethernet pseudowire support (L2TPv3)
lib80211: common routines for IEEE802.11 drivers
lib80211_crypt: registered algorithm 'NULL'
lib80211_crypt: registered algorithm 'WEP'
lib80211_crypt: registered algorithm 'CCMP'
lib80211_crypt: registered algorithm 'TKIP'
VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4
Bus freq driver module loaded
Bus freq driver Enabled
DVFS driver module loaded
regulator_init_complete: SPKVDD: incomplete constraints, leaving on
0100000111
<<-GTP-INFO->> GT9xx Driver Version: V1.8<2013/06/08>
<<-GTP-INFO->> GT9xx Driver Built@10:16:34, Jan  8 2015
msg sel_fttouchpanel i2c read error: -5
[GT9xx_TP]:GT9xx_touch was not used!

Goodix-TS: probe of 0-005d failed with error 44
rtc-pcf8563 5-0051: low voltage detected, date/time is not reliable.
rtc-pcf8563 5-0051: setting system clock to 1970-10-26 00:47:39 UTC (25750059)
Freeing init memory: 236K
init: cannot find '/system/bin/dbus-daemon', disabling 'dbus'
init: cannot execve('/system/etc/install-recovery.sh'): Permission denied
camera_subdev: disagrees about version of symbol module_layout
root@sabresd_6dq:/ # android_usb: already disabled
mtp_bind_config
warning: `rild' uses 32-bit capabilities (legacy support in use)
ov3640_write_reg:write reg error:reg=3012,val=80
ERROR: v4l2 capture: slave not found!
ov3640_write_reg:write reg error:reg=3012,val=80
ehci_fsl_bus_suspend begins, Host 1
ehci_fsl_bus_suspend ends, Host 1
request_suspend_state: wakeup (3->0) at 14431623669 (1970-10-26 00:47:50.783888335 UTC)
eth0: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=1:00, 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
init: sys_prop: permission denied uid:1003  name:service.bootanim.exit
ehci_fsl_bus_suspend begins, Host 1
ehci_fsl_bus_suspend ends, Host 1