CONFIG_PXA_SHARPSL_27x is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Sharp PXA270 models (SL-Cxx00)

configname: CONFIG_PXA_SHARPSL_27x

Select target Sharp Zaurus device range
└─>Sharp PXA270 models (SL-Cxx00)
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
selects
CONFIG_PXA27x