Problem with uboot on lite5200

Hi all,

i am newbee in Linux PPC. i have problem with my lite5200 board. previously
it has been installed with uboot. but now i dont receive any message from
uboot in the serial line (serial line is ok with 115200 bps - tested).

how can i re-flash the uboot inside the MPC5200? i use bdi2000, compiled the
new uboot version 1.1.6 but didnt find out anyway to flash it inside the
controller.

thanks for the hint,