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DHCP request fix for Windows Server 2003

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Added option CONFIG_BOOTP_DHCP_REQUEST_DELAY. This provides an optional
delay before sending "DHCP Request" in net/bootp.c. Required to overcome
interoperability problems with Windows Server 200x DHCP server when U-Boot
client responds too fast for server to handle.

Signed-off-by: Aras Vaichas <arasv@magtech.com.au>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
This commit is contained in:
Aras Vaichas 2008-03-26 09:43:57 +11:00 committed by Ben Warren
parent 74d1e66d22
commit d9a2f416d6
2 changed files with 18 additions and 1 deletions
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14
README
View file

@ -1151,6 +1151,20 @@ The following options need to be configured:
of the "hostname" environment variable is passed as
option 12 to the DHCP server.
CONFIG_BOOTP_DHCP_REQUEST_DELAY
A 32bit value in microseconds for a delay between
receiving a "DHCP Offer" and sending the "DHCP Request".
This fixes a problem with certain DHCP servers that don't
respond 100% of the time to a "DHCP request". E.g. On an
AT91RM9200 processor running at 180MHz, this delay needed
to be *at least* 15,000 usec before a Windows Server 2003
DHCP server would reply 100% of the time. I recommend at
least 50,000 usec to be safe. The alternative is to hope
that one of the retries will be successful but note that
the DHCP timeout and retry process takes a longer than
this delay.
- CDP Options:
CONFIG_CDP_DEVICE_ID

5
net/bootp.c
View file

@ -879,7 +879,10 @@ static void DhcpSendRequestPkt(Bootp_t *bp_offer)
iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
#ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
#endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
NetSendPacket(NetTxPacket, pktlen);
}