CONFIG_CPU_PXA26x is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
CONFIG_CPU_PXA26x (not configurable)
configname: CONFIG_CPU_PXA26x
Linux Kernel Configuration
└─>PXA2xx/PXA3xx-based
└─>CPU_PXA26x
In linux kernel since version 2.6.29 (release Date: 2009-03-23)
Select code specific to PXA26x (codename Dalhart)