CONFIG_MACH_RX3715 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
HP iPAQ rx3715
modulename: mach-rx3715.ko
configname: CONFIG_MACH_RX3715
Linux Kernel Configuration
└─>S3C2440 and S3C2442 Machines
└─>HP iPAQ rx3715
In linux kernel since version 2.6.12
Say Y here if you are using the HP iPAQ rx3715.