CONFIG_PCI_8260 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_PCI_8260 (not configurable)

modulename: m82xx_pci.ko

configname: CONFIG_PCI_8260

Linux/PowerPC Kernel Configuration
└─>Bus options
└─>PCI_8260
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
arch/ppc/syslib/