I have tried only with default Oleg's firmware, and there was an IRQ sharing problem, as you know. The latter posts shows that it is possible to enable IRQ sharing to use both ports, but i'm not sure how both port may work simultaneously for receiving if there is only one physical IRQ line and no flow controll at all. So is it enough to recompile kernel with IRQ sharing enabled to simultaneously use both serials for transmitting and receiving at the same time (not just only for transmitting by both, and receiving only by one port)
