CONFIG_COMEMPCI is not available for thedefaultarchitecture x86.
Result is shown for architecture m68knommu
default or selected kernelversion does not have config value CONFIG_COMEMPCI.
Result is shown for kernelversion 5.4.123

CO-MEM lite PCI controller support

modulename: comempci.ko

configname: CONFIG_COMEMPCI

uClinux/68k (w/o MMU) Kernel Configuration
└─>Bus options (PCI, PCMCIA, EISA, MCA, ISA)
└─>CO-MEM lite PCI controller support
In linux kernel since version 2.6.12  
source code:
arch/m68knommu/kernel/comempci.c
depends
CONFIG_M5307 or CONFIG_M5407