CONFIG_SNI_RM200_PCI is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_SNI_RM200_PCI.
Result is shown for kernelversion 5.4.123

Support for SNI RM200 PCI

modulename: fixup-sni.ko

configname: CONFIG_SNI_RM200_PCI

Linux/MIPS Kernel Configuration
└─>Machine selection
└─>Support for SNI RM200 PCI
In linux kernel since version 2.6.12  
The SNI RM200 PCI was a MIPS-based platform manufactured by Siemens
Nixdorf Informationssysteme (SNI), parent company of Pyramid
Technology and now in turn merged with Fujitsu. Say Y here to
support this machine type.

source code:
arch/mips/pci/