CONFIG_PPC_CHROMA is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

PowerEN PCIe Chroma Card

modulename: chroma.ko

configname: CONFIG_PPC_CHROMA

Linux Kernel Configuration
└─>WSP platform selection
└─>PowerEN PCIe Chroma Card
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
/arch/powerpc/platforms/wsp/