CONFIG_SIBYTE_CRHONE is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

Sibyte BCM91125C-CRhone

configname: CONFIG_SIBYTE_CRHONE

System type
└─>Sibyte BCM91125C-CRhone
In linux kernel since version 2.6.12  

depends
CONFIG_EXPERIMENTAL