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

Freescale 8xx

modulename: start_8xx.ko

and/or

mpc8xx_pic.ko

and/or

m8xx_setup.ko

and/or

softemu8xx.ko

and/or

rheap.ko

and/or

mac-fec.ko

configname: CONFIG_8xx

Processor Type
└─>Freescale 8xx
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
drivers/net//fs_enet/
is selected by
CONFIG_NOT_COHERENT_CACHE