CONFIG_MACH_OMAP_3430SDP is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

OMAP 3430 SDP board

modulename: board-3430sdp.ko

configname: CONFIG_MACH_OMAP_3430SDP

Linux Kernel Configuration
└─>TI OMAP2/3/4 Specific Features
└─>OMAP 3430 SDP board
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
source code:
/arch/arm/mach-omap2/