CONFIG_HAVE_AT91_DATAFLASH_CARD is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
CONFIG_HAVE_AT91_DATAFLASH_CARD (not configurable)
configname: CONFIG_HAVE_AT91_DATAFLASH_CARD
Linux Kernel Configuration
└─>Atmel Non-DT world
└─>HAVE_AT91_DATAFLASH_CARD