Indirect address bus mode

configname: CONFIG_WIZNET_BUS_INDIRECT

WIZnet interface mode
└─>Indirect address bus mode
In linux kernel since version 3.1 (release Date: 2011-10-24)  
In indirect address mode host system indirectly accesses registers
using Indirect Mode Address Register and Indirect Mode Data Register,
which are directly mapped to Memory-Mapped I/O space.