CONFIG_PPC_86xx is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
86xx-based boards
configname: CONFIG_PPC_86xx
Linux Kernel Configuration
└─>86xx-based boards
In linux kernel since version 2.6.18 (release Date: 2006-09-19)
The Freescale E600 SoCs have 74xx cores.