CONFIG_MACH_TREO680 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Palm Treo 680

configname: CONFIG_MACH_TREO680

Linux Kernel Configuration
└─>Intel PXA2xx/PXA3xx Implementations
└─>Palm Treo 680
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
Say Y here if you intend to run this kernel on Palm Treo 680
smartphone.