From 6b52cfe16cd539935e32bd8cf19146522e462a4d Mon Sep 17 00:00:00 2001
From: Remy Bohmer <linux@bohmer.net>
Date: Tue, 3 Jun 2008 15:48:17 +0200
Subject: Get rid of annoying/superfluous bad-checksum warning message

U-boot can complain a lot about 'checksum bad' when it is attached to the network.
It is annoying for ordinary users who start to doubt the network connection
in general when they see messages like this.

This is caused by the routine NetCksumOk() which cannot handle IP-headers longer
than 20 bytes. Those packages can be ignored anyway by U-boot, so we trash them
now before checking the checksum.

Signed-off-by: Remy Bohmer <linux@bohmer.net>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

diff --git a/net/net.c b/net/net.c
index 7812877..f55c7fa 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1407,6 +1407,10 @@ NetReceive(volatile uchar * inpkt, int len)
 		if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
 			return;
 		}
+		/* can't deal with headers > 20 bytes */
+		if ((ip->ip_hl_v & 0x0f) > 0x05) {
+			return;
+		}
 		if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
 			puts ("checksum bad\n");
 			return;
-- 
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