CONFIG_GRPCI2 is not available for thedefaultarchitecture x86.
Result is shown for architecture sparc
default or selected kernelversion does not have config value CONFIG_GRPCI2.
Result is shown for kernelversion 6.2.5

GRPCI2 Host Bridge Support

modulename: leon_pci_grpci2.ko

configname: CONFIG_GRPCI2

Linux Kernel Configuration
└─>Bus options (PCI etc.)
└─>GRPCI2 Host Bridge Support
In linux kernel since version 3 (release Date: 2011-07-21)  
Say Y here to include the GRPCI2 Host Bridge Driver.

source code: