[U-Boot] [HELP]uboot 1.3.4 can't work on my MPC8548 board

Hi: I downloaded uboot 1.3.4 and build it successfully, but it can't work on my MPC8548 board. There is no output message after power on. I use USB TAB to trace where the problem is and find that cpu died during relocation of CCSRBAR in cpu_init_early_f function. Is there anyone who also finds this problem, or maybe is it due to my hardware's problem?