系统以前一直都正常，有次上电突然启动时停在Uncompressing Linux... done, booting the kernel.不跑了，什么原因

OMAP-L138 initialization passed!
Booting TI User Boot Loader
        UBL Version: 1.65
        UBL Flashtype: SPI
Starting SPI Memory Copy...
Valid magicnum, 0x55424CBB, found at offset 0x00010000.
   DONE
Jumping to entry point at 0xC1080000.


U-Boot 2009.08 (Jul 26 2012 - 15:53:26)

I2C:   ready
DRAM:  64 MB
In:    serial
Out:   serial
Err:   serial
ARM Clock : 300000000 Hz
DDR Clock : 150000000 Hz
Net:   In ether.c:davinci_emac_initialize at 621
Ethernet PHY: GENERIC @ 0x00

Hit any key to stop autoboot:  3  2  1  0
8192 KiB M25P64 at 0:0 is now current device
## Booting kernel from Legacy Image at c0700000 ...
   Image Name:   Linux-2.6.33-rc4
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1742616 Bytes =  1.7 MB
   Load Address: c0008000
   Entry Point:  c0008000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.

系统以前一直都正常，有次上电突然启动时停在Uncompressing Linux... done, booting the kernel.不跑了，什么原因？请大侠指点！