CONFIG_GDBSTUB_ON_TTYS0 is not available for thedefaultarchitecture x86.
Result is shown for architecture mn10300
default or selected kernelversion does not have config value CONFIG_GDBSTUB_ON_TTYS0.
Result is shown for kernelversion 6.7-rc3
/dev/ttyS0
configname: CONFIG_GDBSTUB_ON_TTYS0
GDB stub port
└─>/dev/ttyS0