CONFIG_BGMAC (not configurable)

modulename: bgmac.ko

configname: CONFIG_BGMAC

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>BGMAC
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This enables the integrated ethernet controller support for many
Broadcom (mostly iProc) SoCs. An appropriate bus interface driver
needs to be enabled to select this.

source code:
drivers/net/ethernet/broadcom/bgmac.c