I've implemented some UDP/IP functionality over Serial Line Internet Protocol between my LINUX box and my 80c552 development board. I've got interface sl0 with IP address 10.0.0.63 up and running point-to-point with my 80c552 whose IP address is 10.0.0.64. The serial link runs at 9600 baud.

Visit the 80c552 section of my website http://www.tigerprecision.com/80c552 and have a look. I've published the UDP client code. It basically builds a UDP packet, with a 14 byte ASCII string as its payload ("I love tigers!"), and sends it according to RFC1055 (SLIP). The documentation I have written is nowheres near complete. But this is a much cheaper and simpler solution than adding an embedded ethernet controller.

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