[U-Boot] Old version of u-boot(OF not supported) loads latest linux kernel(OF supported), any problem？

Hi: On MPC8548CDS board, is there any problem when I use old version of u-boot which does not support open firmware to load latest linux kernel which supports open firmware? If so, how can kernel know whether parameters passed by u-boot supports dtb？

For latest kernels, is it a must for uboot to pass dtb to it?