CONFIG_PLAT_SPEAR is not available for the selected architecture x86.
Result is shown for architecture arm
ST SPEAr
configname: CONFIG_PLAT_SPEAR
ARM system type
└─>ST SPEAr
In linux kernel since version 2.6.35 (release Date: 2010-08-01)
Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
depends
or CONFIG_ARCH_MULTI_V5 or CONFIG_ARCH_MULTI_V7 or CONFIG_ARCH_MULTI_V5 || CONFIG_CPU_LITTLE_ENDIAN