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

Video memory size (dec, in MB)

configname: CONFIG_ETRAX_VMEM_SIZE

Linux Kernel Configuration
└─>Hardware setup
└─>Video memory size (dec, in MB)
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
Size of Video accessible memory (decimal, in MB).