CONFIG_GDBSTUB_ON_TTYS1 is not available for thedefaultarchitecture x86.
Result is shown for architecture mn10300
default or selected kernelversion does not have config value CONFIG_GDBSTUB_ON_TTYS1.
Result is shown for kernelversion 6.7-rc3
/dev/ttyS1
configname: CONFIG_GDBSTUB_ON_TTYS1
GDB stub port
└─>/dev/ttyS1