CONFIG_8xx is not available for thedefaultarchitecture x86.
Result is shown for architecture ppc

8xx

modulename: m8xx_setup.ko

and/or

softemu8xx.ko

and/or

mpc8xx_pic.ko

configname: CONFIG_8xx

Processor Type
└─>8xx
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
arch/ppc/syslib/