CONFIG_DTCM_RAM_BASE is not available for thedefaultarchitecture x86.
Result is shown for architecture csky

DTCM ram base

configname: CONFIG_DTCM_RAM_BASE

Linux Kernel Configuration
└─>Processor type and features
└─>Tightly-Coupled/Sram Memory
└─>DTCM ram base
In linux kernel since version 5.1 (release Date: 2019-05-05)