CONFIG_GDBSTUB_ON_TTYSM1 is not available for thedefaultarchitecture x86.
Result is shown for architecture mn10300
default or selected kernelversion does not have config value CONFIG_GDBSTUB_ON_TTYSM1.
Result is shown for kernelversion 6.7-rc3
/dev/ttySM1 [SIF1]
configname: CONFIG_GDBSTUB_ON_TTYSM1
GDB stub port
└─>/dev/ttySM1 [SIF1]