booting linux-2.6.15 hang on custom mpc8555 board

[huangyun at coship.com]

hi,everyone
   I have porting linux2.6.15 of eldk4.0 to my mpc8555 board, my bootloader
is u-boot1.1.6, the uboot running is ok,but it hang at booting kernel.no
any print message.
I have check the CCSRBAR(0xe0000000) and bd_t struct is the  same as linux
kernel,  my serial port use uart1. somebody help me! i'm a linux kernel
newer.
   there is some booting information:

CPU:   8555, Version: 1.1, (0x80790011)
Core:  E500, Version: 2.0, (0x80200020)
Clock Configuration:
       CPU: 660 MHz, CCB: 330
       DDR: 165 MHz, LBC:  82 MHz
L1:    D-cache 32 kB enabled
       I-cache 32 kB enabled
Board: IP
    PCI1: 32 bit, 66 MHz (compiled)
I2C:   ready
DRAM:  Initializing
    DDR: 256 MB
before relocate_code
FLASH:
the first flash SST39VF040 size:  512 KB
the second flash MX29LV640MBTC size:  8 MB
the third flash MX29LV640MBTC size:  8 MB
Total Flash capacity: 16.5 MB
L2 cache 256KB: enabled
*** Warning - bad CRC, using default environment

leave the env
enter into getenv
leave getenv
In:    serial
Out:   serial
Err:   serial
Net:
TSEC0, TSEC1
Hit any key to stop autoboot:  0
Waiting for PHY auto negotiation to complete. done
Speed: 1000, full duplex
Using TSEC0 device
TFTP from server 192.168.96.110; our IP address is 192.168.96.168
Filename 'uImage'.
Load address: 0x1000000
Loading: #################################################################
         #################################################################
         #################################################################
         ##################
done
Bytes transferred = 1088988 (109ddc hex)
## Booting image at 01000000 ...
   Image Name:   Linux-2.6.15
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    1088924 Bytes =  1 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ...OK