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

System Clock Divider

configname: CONFIG_SCLK_DIV

Linux Kernel Configuration
└─>Blackfin Processor Options
└─>Board customizations
└─>System Clock Divider
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
This sets the frequency of the system clock (including SDRAM or DDR) on
!BF60x else it set the clock for system buses and provides the
source from which SCLK0 and SCLK1 are derived.
This can be between 1 and 15
System Clock = (PLL frequency) / (this setting)