CONFIG_PPC_INDIRECT_IO is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_PPC_INDIRECT_IO (not configurable)

configname: CONFIG_PPC_INDIRECT_IO

Linux/PowerPC Kernel Configuration
└─>Platform support
└─>PPC_INDIRECT_IO
In linux kernel since version 2.6.20 (release Date: 2007-02-04)