CONFIG_NS9XXX_HAVE_SERIAL8250 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
CONFIG_NS9XXX_HAVE_SERIAL8250 (not configurable)
modulename: plat-serial8250.ko
configname: CONFIG_NS9XXX_HAVE_SERIAL8250
Linux Kernel Configuration
└─>NS9xxx Implementations
└─>NS9XXX_HAVE_SERIAL8250