default or selected kernelversion does not have config value CONFIG_MTDRAM_ABS_POS.
Result is shown for kernelversion 6.5.1

SRAM Hexadecimal Absolute position or 0

configname: CONFIG_MTDRAM_ABS_POS

Linux Kernel Configuration
└─>Device Drivers
└─>Memory Technology Device (MTD) support
└─>Self-contained MTD device drivers
└─>SRAM Hexadecimal Absolute position or 0
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
If you have system RAM accessible by the CPU but not used by Linux
in normal operation, you can give the physical address at which the
available RAM starts, and the MTDRAM driver will use it instead of
allocating space from Linux's available memory. Otherwise, leave
this set to zero. Most people will want to leave this as zero.