CONFIG_BCM47XX is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
Broadcom BCM47XX based boards
modulename: pci-bcm47xx.ko
configname: CONFIG_BCM47XX
System type
└─>Broadcom BCM47XX based boards
In linux kernel since version 2.6.24 (release Date: 2008-01-24)
Support for BCM47XX based boards