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

BCM91250PT-PTSWARM

configname: CONFIG_SIBYTE_PTSWARM

BCM1xxx SOC-based board
└─>BCM91250PT-PTSWARM
In linux kernel since version 2.6.12