Been a long time since I tried it, but I think I had either Relokick or Kick13 working at one stage.
I know it was very fiddley, and for running old progs on the A600 it's a lot more reliable to get yourself an OS 1.3 ROM and a ROM switcher, so you can choose to boot 1.3 or 2.x. Though under 1.3 I doubt the A600's hard driver controller will work.
