Make bootp implementation RFC3046 compliant

Patch by Joakim Larsson, 27 Jun 2006

CHANGELOG

@@ -2,6 +2,9 @@
 Changes since U-Boot 1.1.4:
 ======================================================================
 
+* Make bootp implementation RFC3046 compliant
+  Patch by Joakim Larsson, 27 Jun 2006
+
 * TQM5200: perform POST memory test only on STK52xx carrier board.
   (and then only if PSC6_3 is read as "1" when booting).
   Patch by Martin Krause, 21 Jun 2006

net/bootp.c

@@ -851,7 +851,12 @@ static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 	NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */
 	NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr);
 	NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr);
-	NetCopyIP(&bp->bp_giaddr, &bp_offer->bp_giaddr);
+	/* 
+	 * RFC3046 requires Relay Agents to discard packets with
+	 * nonzero and offered giaddr
+	 */
+	NetWriteIP(&bp->bp_giaddr, 0);
+
 	memcpy (bp->bp_chaddr, NetOurEther, 6);
 
 	/*