for help about boot linux kernel on ep7312 board

Hi,all:

I have a EP7312 board:
flash: Intel: 28F320J3
DRAM: 0xc0000000--0xc1000000
without a ethnet nic.

I can run u-boot 0.30 on the board .
I download the linux kernel to 0xc0500000 using JTAG(TRACE32ICD),then run iminfo:

EP7312 # imi
## Checking Image at c0500000 ...
Image Name:
Image Type: ARM Linux Kernel Image (gzip compressed)
Data Size: 344968 Bytes = 336.9 kB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK

Then bootm it:

EP7312 # bootm 0xc0500000
## Booting image at c0500000 ...
Image Name:
Image Type: ARM Linux Kernel Image (gzip compressed)
Data Size: 344968 Bytes = 336.9 kB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK

Starting kernel ...

IT HANGS!

The linux kernel is OK, i have run it happily without u-boot to boot it.

Any suggestion is appreciated!

thanks.
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