These '.bin' files are the '.kwb' files that the Upgrade-U-Boot_Kirkwood_HOWTO.txt
refers to.  '.bin' seems to be the old Marvell way of naming them, so I kept it.

You can drop one of these in to /tftpboot on your TFTP server, rename it u-boot.kwb
and upgrade from it.  Or obviously, 'tftpboot' a different file name ;-)

-- 
Stuart Winter
14-Jul-2014