CONFIG_8xx is not available for the default architecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_8xx.
Result is shown for kernelversion 5.8-rc7
is selected by

CONFIG_8xx (not configurable)

modulename: mpc8xx_pic.ko
configname: CONFIG_8xx

Linux Kernel Configuration
└─> Processor support
└─> 8xx

source code: