CONFIG_SERIAL_RM9000 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_SERIAL_RM9000.
Result is shown for kernelversion 6.2.5
CONFIG_SERIAL_RM9000 (not configurable)
configname: CONFIG_SERIAL_RM9000
Linux Kernel Configuration
└─>SERIAL_RM9000