Kernel panic on Ubuntu_Equinox64

When download uImage into the target and almost finished the kernel panic because No filesystem could mount into root.
[    6.355357] No filesystem could mount root, tried:
[    6.360285] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)


 Details:
[    2.393858] Read value 0x0000006e on port 7
[    2.398089] Read value 0x00000075 on port 7
[    2.402296] Read value 0x00000070 on port 7
[    2.406526] Read value 0x0000006e on port 7
[    2.410733] Read value 0x0000006f on port 7
[    2.414963] Read value 0x00000070 on port 7
[    2.419170] Read value 0x0000006e on port 7
[    2.423376] Read value 0x00000072 on port 7
[    2.427607] Read value 0x0000006b on port 7
[    2.431814] Read value 0x0000006f on port 7
[    2.436908] bcm589x-bbl bcm589x-bbl: BBL hardware initialized
[    2.508221] NET: Registered protocol family 38
[    2.514900] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253)
[    2.522344] io scheduler noop registered
[    2.526545] io scheduler deadline registered
[    2.531080] io scheduler cfq registered (default)
[    2.536079] bcm589x-gpio bcm589x-gpio: Initialized chip 589x with GPIO lines 0:114
[    2.548563] uart-pl011 uart0: DMA channel TX dma1chan0
[    2.553754] uart-pl011 uart0: DMA channel RX dma1chan1
[    2.559295] uart-pl011 uart1: DMA channel TX dma1chan2
[    2.564632] uart-pl011 uart1: DMA channel RX dma1chan3
[    2.569809] uart-pl011 uart2: DMA channel TX dma1chan4
[    2.575054] uart-pl011 uart2: DMA channel RX dma1chan5
[    2.580228] uart-pl011 uart3: DMA channel TX dma1chan6
[    2.585456] uart-pl011 uart3: DMA channel RX dma1chan7
[    2.592554] bcm589x_mac: MAC addr: 00:0a:f7:00:01:66
[    2.600241] bcm589x_mac_mdio: probed
[    2.607142] bcm589x-rtc bcm589x-rtc: rtc core: registered bcm589x-rtc as rtc0
[    2.616072] Registered led device: bcm589x:msr
[    2.621324] Registered led device: bcm589x:keypad
[    2.626827] ss_proxy_init: Security Service device Version: AA0100AA !
[    2.697114] ss_kernel_verify_sbi: Final SBI check success!
[    2.703817] Certificate used earlier than allowed (2(now)<1327085672)
[    2.722817] ss_kernel_cert_init: Lib success !
[    2.727345] ss_kernel_cfg_create: sys/kernel/syscfg ...
[    2.732609] ss_kernel_spak_get_security_standard: Can not find security standard!!
[    2.740249] ss_kernel_cfg_set_security_standard: PCI : len: 3 Ver: 3.1 : len: 3
[    3.244701] ss_kernel_rng_init
[    3.256718] ss_kernel_tamper_init
[    3.261658] ss_kernel_kek_init
[    3.265923] ss_kernel_mem_init
[    3.270174] ss_kernel_spak_drv_init
[    3.274664] ss_kernel_pin_init
[    3.278958] input: ss_pin as /devices/virtual/input/input0
[    3.285692] TCP cubic registered
[    3.291862] bcm589x-rtc bcm589x-rtc: setting system clock to 1970-01-01 00:00:00 UTC (0)
[    3.315230] IP-Config: Gateway not on directly connected network.
[    3.322026] Waiting 3sec before mounting root device...
[    5.295187] PHY eth0: link status:1 Autoneg 1 100base-FD
[    5.312399] CONTEXT eth0: link available: 100base-FD
[    6.345407] VFS: Unable to mount root fs via NFS, trying floppy.
[    6.351648] List of all partitions:
[    6.355357] No filesystem could mount root, tried:
[    6.360285] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
[    6.368720] [<c002867c>] (unwind_backtrace+0x0/0xf0) from [<c023caf0>] (panic+0x64/0x17c)
[    6.377014] [<c023caf0>] (panic+0x64/0x17c) from [<c0008d1c>] (mount_block_root+0x1d4/0x214)
[    6.385544] [<c0008d1c>] (mount_block_root+0x1d4/0x214) from [<c0008e00>] (mount_root+0xa4/0xc8)
[    6.394415] [<c0008e00>] (mount_root+0xa4/0xc8) from [<c0008f44>] (prepare_namespace+0x120/0x184)
[    6.403343] [<c0008f44>] (prepare_namespace+0x120/0x184) from [<c000895c>] (kernel_init+0xe4/0x118)
[    6.412472] [<c000895c>] (kernel_init+0xe4/0x118) from [<c0023eec>] (kernel_thread_exit+0x0/0x8)