CONFIG_EPAPR_BOOT is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
CONFIG_EPAPR_BOOT (not configurable)
configname: CONFIG_EPAPR_BOOT
Linux Kernel Configuration
└─>EPAPR_BOOT
In linux kernel since version 3 (release Date: 2011-07-21)
Used to allow a board to specify it wants an ePAPR compliant wrapper.