CONFIG_8xx_CPU6 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_8xx_CPU6.
Result is shown for kernelversion 6.7-rc3

CPU6 Silicon Errata (860 Pre Rev. C)

configname: CONFIG_8xx_CPU6

Linux Kernel Configuration
└─>MPC8xx CPM Options
└─>CPU6 Silicon Errata (860 Pre Rev. C)
In linux kernel since version 2.6.12  
MPC860 CPUs, prior to Rev C have some bugs in the silicon, which
require workarounds for Linux (and most other OSes to work). If you
get a BUG() very early in boot, this might fix the problem. For
more details read the document entitled "MPC860 Family Device Errata
Reference" on Freescale's website. This option also incurs a
performance hit.

If in doubt, say N here.

depends
CONFIG_PPC_8xx