In page 10 of 920732TAG00-HWUM100-R.pdf, it tell use that how to boot BCM20732 chipset from ROM. It can recover BCM20732 when it NVRAM is corrupted and be unable to boot up correctly.
You can connect SDA (pin 22 on the BCM20732S module) to GND only during boot and then disconnect pin 22 from GND when ready to download new application to the EEPROM.
