multicast tftp: RFC2090

Implemented IETF RFC2090, Multicast TFTP.  Initial implementation
on Realtek RTL8139 and Freescale TSEC.

Signed-off-by: David Updegraff <dave@cray.com>
Signed-off-by: Ben Warren <bwarren@qstreams.com>
diff --git a/drivers/rtl8139.c b/drivers/rtl8139.c
index 9045523..3e259b6 100644
--- a/drivers/rtl8139.c
+++ b/drivers/rtl8139.c
@@ -193,6 +193,10 @@
 static int rtl_transmit(struct eth_device *dev, volatile void *packet, int length);
 static int rtl_poll(struct eth_device *dev);
 static void rtl_disable(struct eth_device *dev);
+#ifdef CONFIG_MCAST_TFTP/*  This driver already accepts all b/mcast */
+static int rtl_bcast_addr (struct eth_device *dev, u8 bcast_mac, u8 set) 
+ { return (0); }
+#endif
 
 static struct pci_device_id supported[] = {
        {PCI_VENDOR_ID_REALTEK, PCI_DEVICE_ID_REALTEK_8139},
@@ -228,6 +232,9 @@
 		dev->halt = rtl_disable;
 		dev->send = rtl_transmit;
 		dev->recv = rtl_poll;
+#ifdef CONFIG_MCAST_TFTP
+		dev->mcast = rtl_bcast_addr;
+#endif
 
 		eth_register (dev);