CONFIG_RAM_BASE is not available for thedefaultarchitecture x86.
Result is shown for architecture csky
default or selected kernelversion does not have config value CONFIG_RAM_BASE.
Result is shown for kernelversion 6.5.1

DRAM start addr (the same with memory-section in dts)

configname: CONFIG_RAM_BASE

Linux Kernel Configuration
└─>Processor type and features
└─>DRAM start addr (the same with memory-section in dts)
In linux kernel since version 4.2 (release Date: 2015-08-30)