Beaglebone board not booting

when i tried to boot my uImage on the beaglebone it showed the error : FDT and ATAGS support not compiled in - hanging . I didnt understand what this error means. The u -boot commands that i used are

setenv fdt_high 0xffffffff
mmc rescan 0
fatload mmc 0 80000000 am335x-evm.dtb
fatload mmc 0 81000000 uImage
setenv bootargs console=ttyO0,115200n8 root=/dev/nfs nfsroot=/,nolock rw mem=256M ip=dhcp
bootm 81000000 - 80000000