[U-Boot-Users] UBoot's terminal server

From UBoot manual:

"...There are several ways to access the serial console port on your target system, such as using a terminal server, but the most common way is to attach it to a serial port on your host. Additionally, you will need a terminal emulation program on your host system, such as cu or kermit. .."

My question is: How can I use Uboot shell wo RS232 COMport connection - are there ways to get rsh (telnet or whatever) server working on UBoot? Yes, I'm using RS232 currently, but what if I want to use UBoot shell through ethernet, how could I configure UBoot to make it setup "terminal server"?