I cannot directly answer your question as I don't know what type of physical interface you are looking for. However, there are two really useful documents on the Marvell site that might help you decide for yourself:http://www.marvell.com/products/processors/embedded/kirkwood/HW_88F6281_OpenSource.pdf
The second one is pretty large but has all of the information on the different SOC blocks. The first one has the GPIO pin multiplexing tables in it.
I hope one of these helps you out.