CONFIG_CPU_PXA310 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
PXA310 (codename Monahans-LV)
configname: CONFIG_CPU_PXA310
Linux Kernel Configuration
└─>Intel PXA2xx/PXA3xx Implementations
└─>Supported PXA3xx Processor Variants
└─>PXA310 (codename Monahans-LV)