The supplied 3c503 drivers don use the AUI (thicknet) port. How does one choose it over the default thinnet port?
Solution: The 3c503 AUI port can be selected at boot-time for in-kernel drivers, and at module insertion for modular drivers. The selection is overloaded onto the low bit of the currently-unused dev->rmem_start variable, so a boot-time parameter of: LILO: linux ether=0,0,0,1,eth0 should work for in-kernel drivers. To specify the AUI port when loading as a module, just append xcvr=1 to the module options line along with your I/O and IRQ values.