Trouble booting Kernel 2.6.12 on powerpc 8540

Hi,
   First time iam porting linux kernel 2.6.12 on MPC8540(PIC) board.In
platform code  i have set the CCSRBAR  to 0xff70 0000 which is the
default value for 8540. it gets hanged at "Uncompressing kernel image...ok".Iam
using u-boot-1.1.2.

Should i edit anything in .config file?

Thanks and Regards
Revathy