CONFIG_BOARD_SPEAR320_EVB is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

SPEAr320 Evaluation Board

modulename: spear320_evb.ko

configname: CONFIG_BOARD_SPEAR320_EVB

SPEAr320 Boards
└─>SPEAr320 Evaluation Board
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
Supports ST SPEAr320 Evaluation Board

source code:
arch/arm/mach-spear3xx/spear320_evb.c

depends
 or CONFIG_ARCH_SPEAR3XX