[U-Boot] DHCP/BOOP command behavior

Hi all, I'm migrating from u-boot 1.0.0 to 1.3.4 and noticed that the behavior of bootp/dhcp command has changed. In 1.0.0, bootp/dhcp would just get IP setting. But in 1.3.4, they try to download the boot image using tftp after acquiring the ip from the dhcp server. How can I make it behave the old way?

Thanks.

Brian