My Kernel print nothing after “Uncompressing Linux......... done, booting the kerne ”

The following is my operations:

1.setup ezsdk_5_01_01_80

2.rebuild the SD card with ${EZSDK}/bin/mksdboot.sh --device /dev/sdb --sdk ${EZSDK}

3.check the switch sw3 sw4

4.power on

But the serial only print here“ “Uncompressing Linux......... done, booting the kerne ”,

I reboot the demo board with power ,and md the address of __log_buf,and debug ,find that, the content in the buffer as follow:

................
................
....l.i2c2_scl..
................
................
................
....sda.i2c2_sda
               
................
................
................
....vpss device
.<3>pm_dbg_init:
 only OMAP3 supp
orted.<6>Registe
red ti81xx_fb de
vice............
................
................
....pcie: Settin
g up Host Contro
ller............
................
....e mapped @0x
               
d0820000........
................
................

and the kernel stop at the function   start_kernel(void) –>rest_init()->schedule()

and I did no change  to the kernel and u-boot,

and  my demo board version is  : main board version :E and daughter board version is :C

how can I boot the demo baord with my SD card;