CONFIG_MXS_HAVE_AMBA_DUART is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
CONFIG_MXS_HAVE_AMBA_DUART (not configurable)
modulename: amba-duart.ko
configname: CONFIG_MXS_HAVE_AMBA_DUART
Linux Kernel Configuration
└─>MXS_HAVE_AMBA_DUART