CONFIG_SINGLE_MEMORY_CHUNK is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

Use one physical chunk of memory only

configname: CONFIG_SINGLE_MEMORY_CHUNK

Linux Kernel Configuration
└─>Use one physical chunk of memory only
In linux kernel since version 2.6.12  
Ignore all but the first contiguous chunk of physical memory for VM
purposes. This will save a few bytes kernel size and may speed up
some operations.
When this option os set to N, you may want to lower "Maximum zone
order" to save memory that could be wasted for unused memory map.
Say N if not sure.

depends
CONFIG_MMU