CONFIG_PXA25x is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
CONFIG_PXA25x (not configurable)
modulename: mfp-pxa2xx.ko
configname: CONFIG_PXA25x
Linux Kernel Configuration
└─>PXA25x
In linux kernel since version 2.6.20 (release Date: 2007-02-04)
Select code specific to PXA21x/25x/26x variants