CONFIG_M5271EVB is not available for the selected architecture x86.
Result is shown for architecture m68k
Freescale (Motorola) M5271EVB board support
configname: CONFIG_M5271EVB
Linux Kernel Configuration
└─>Freescale (Motorola) M5271EVB board support
In linux kernel since version 2.6.12 )
Support for the Freescale (Motorola) M5271EVB board.