CONFIG_PPC_MPC832x is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_PPC_MPC832x (not configurable)

configname: CONFIG_PPC_MPC832x

Linux Kernel Configuration
└─>PPC_MPC832x
In linux kernel since version 2.6.19 (release Date: 2006-11-29)