CONFIG_MACH_SPEAR320 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
SPEAr320 Machine support with Device Tree
modulename: spear320.ko
configname: CONFIG_MACH_SPEAR320
Linux Kernel Configuration
└─>ST SPEAr Family
└─>SPEAr320 Machine support with Device Tree
In linux kernel since version 2.6.35 (release Date: 2010-08-01)
Supports ST SPEAr320 machine configured via the device-tree