CONFIG_MACH_OMAP_PERSEUS2 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

TI Perseus2

modulename: board-perseus2.ko

configname: CONFIG_MACH_OMAP_PERSEUS2

Linux Kernel Configuration
└─>TI OMAP1 specific features
└─>TI Perseus2
In linux kernel since version 2.6.12  
Support for TI OMAP 730 Perseus2 board. Say Y here if you have such
a board.

source code:
/arch/arm/mach-omap1/