cap2666

hello,I have this problem with the ap121u,evrithig works fine when I try to do a fresh install of mark4 but when I put the command tftp 0x80600000 kernel.bin is not passing from here.....it entering in a loop and is giveing me T T T T T T T T T....and I dont now why my tftp server in putty is 192.168.2.100....I m lost....thanks