CONFIG_ARC_DCCM_SZ is not available for thedefaultarchitecture x86.
Result is shown for architecture arc

DCCM Size in KB

configname: CONFIG_ARC_DCCM_SZ

Linux Kernel Configuration
└─>ARC Architecture Configuration
└─>ARC CPU Configuration
└─>DCCM Size in KB
In linux kernel since version 3.1 (release Date: 2011-10-24)