The integrated PHY requires a closed-source binary driver provided by Broadcom. It communicates via an API layer ( dsl_cpe_api ). The firmware must load a DSP (Digital Signal Processor) firmware patch during initialization.
: For those researching security, general papers on Static Analysis of IoT Firmware often use Broadcom-based router samples to identify vulnerabilities like memory mismanagement (CWE-416) or exposed debugging interfaces. Hardware Context bcm63381b0 firmware