CONFIG_S3C2443_DMA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C2443_DMA (not configurable)

modulename: dma.ko

and/or

dma-s3c2443.ko

configname: CONFIG_S3C2443_DMA

Linux Kernel Configuration
└─>SAMSUNG S3C24XX SoCs Support
└─>S3C2443_DMA
In linux kernel since version 2.6.21 (release Date: 2007-04-25)  
Internal config node for S3C2443 DMA support

source code:
/arch/arm/mach-s3c24xx/dma-s3c2443.c