CONFIG_8xx is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_8xx.
Result is shown for kernelversion 6.5.1

CONFIG_8xx (not configurable)

modulename: mpc8xx_pic.ko

configname: CONFIG_8xx

Linux Kernel Configuration
└─>Processor support
└─>8xx
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
/arch/powerpc/sysdev/