CONFIG_SIBYTE_UNKNOWN is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_SIBYTE_UNKNOWN.
Result is shown for kernelversion 5.4.123

Other

configname: CONFIG_SIBYTE_UNKNOWN

BCM1xxx SOC-based board
└─>Other
In linux kernel since version 2.6.12