CONFIG_ETRAX_DEF_R_DRAM_TIMING is not available for thedefaultarchitecture x86.
Result is shown for architecture cris
default or selected kernelversion does not have config value CONFIG_ETRAX_DEF_R_DRAM_TIMING.
Result is shown for kernelversion 6.7-rc3

R_DRAM_TIMING

configname: CONFIG_ETRAX_DEF_R_DRAM_TIMING

Linux Kernel Configuration
└─>CRIS v10 options
└─>R_DRAM_TIMING
In linux kernel since version 2.6.12  
Different DRAM chips have different speeds. Current Axis products
use 50ns DRAM chips which can use the timing: 5611.