You also need to set the bootcmd correctly. This one will work:
setenv bootcmd 'cp.b 0xEC000000 0x2000000 0x2000000; interrupts off; bootm start 0x2000000; bootm loados; bootm ramdisk; fdt resize; fdt boardsetup; fdt chosen; bootm prep; bootm go;'
You also need to set the bootcmd correctly. This one will work:
setenv bootcmd 'cp.b 0xEC000000 0x2000000 0x2000000; interrupts off; bootm start 0x2000000; bootm loados; bootm ramdisk; fdt resize; fdt boardsetup; fdt chosen; bootm prep; bootm go;'