[lwip-users] Help with IP header size

[Adam Fullerton]

Hi,

I am trying to make lwIP work with a big endian SH processor, but I think
that I have some of the configuration options set incorrectly. The
processor is 32 bit and the DMA requires the data to be 4 bytes aligned.

When I look at the data sent by a DHCP discover it has a two byte offset
at the start:

ipStart: MAC: 00:00:87:36:C4:99
ipInitialise: 9
ipLinkMonitor: Started
ipLinkMonitor: Link Down
ipLinkMonitor: Link Up
dhcp_start(netif=c006924) E0
dhcp_start(): starting new DHCP client
dhcp_start(): allocated dhcpdhcp_start(): starting DHCP
configuration
dhcp_discover()
transaction id xid(1)
dhcp_discover: making request
dhcp_discover: realloc()ing
dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)
ipOutput: 9
ipOutput 0 0xc07bd50 352 Total 352
00 00 FF FF FF
FF FF FF 00 00 87 36 C4 99 08 00
45 00 01 50 00 00 00 00 FF 11 BA 9D 00 00 00 00
FF FF FF FF 00 44 00 43 01 3C D0 A4 01 01 06 00
00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 87 36 C4 99 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 63 82 53 63 35 01 01 39
02 05 DC 37 04 01 03 1C 06 FF 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
dhcp_discover: deleting()ing
dhcp_discover: SELECTING
dhcp_discover(): set request timeout 2000 msecs

Which settings have I got wrong?

Thanks in advance.

Adam Fullerton.