CONFIG_MACH_PALMT5 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Palm Tungsten|T5

modulename: palmt5.ko

configname: CONFIG_MACH_PALMT5

Linux Kernel Configuration
└─>PXA2xx/PXA3xx-based
└─>Intel PXA2xx/PXA3xx Implementations
└─>Palm Tungsten|T5
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
Say Y here if you intend to run this kernel on a Palm Tungsten|T5
handheld computer.

source code: