CONFIG_S3C64XX_DMA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

S3C64XX DMA

modulename: dma.ko

configname: CONFIG_S3C64XX_DMA

Linux Kernel Configuration
└─>S3C64XX DMA
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
source code:
arch/arm/mach-s3c64xx/dma.c
selects
CONFIG_S3C_DMA