Trying to dereference the mac_address within MACDriver.MACConfig

dereferencing the mac_address

int fnet_stm32_set_hw_addr(fnet_netif_t *netif, unsigned char * hw_addr)
{
  unsigned i;
  (void)netif;
  ////MACDriver *ethif = (MACDriver *)((fnet_eth_if_t *)(netif->if_ptr))->if_cpu_ptr);
  //MACConfig *config = ETHD1.config;
  //fnet_mac_addr_t *mac_ptr = config->mac_address;

  fnet_mac_addr_t *mac_ptr = ETHD1.config.mac_address;
  for (i = 0; i < 6; i++)
    (mac_ptr)[i] = (*hw_addr)[i];
      
	return FNET_OK;
}