lwIP configuration option patch

[Uwe Kindler]

Hello Andrew,

I never used DHCP with lwIP here so I never discovered this problem. I 
used a fixed IP address to run the tests. Today I compiled the tests 
with DHCP support and tried to debug them but insight did not list the 
dhcp.c file in its sources. I inserted an #error message into the dhcp.c 
file to check if it is built - it is. So it must be linker garbage 
collection because the dhcp functions are simply not referenced anywhere 
in the code. I checked the lwip code and there is not initialisation for 
dhcp and also the timer functions dhcp_fine_tmr() and dhcp_coarse_tmr() 
are never called.

So obviously Jani Monoses, who contributed the original lwIP patch, also 
never used DHCP ;o) I will try to add DHCP support as soon as I have the 
time (maybe in some weeks). At least my patch did not broke DHCP support 
- so please try a fixed IP address when testing.

Uwe

> ecosconfig new linux lwip_eth
> 
> then enabled dhcp. I then built eCos and the lwip tests. I found that
> it does not send anything out the ethernet port. Enabling debugging it
> looks like it is not adding the ethernet interface, there is only the
> loopback interface.
> 
> lunn@londo:~/eCos/work2$ ./install/tests/net/lwip_tcpip/current/tests/httpd
> netif_set_ipaddr: netif address being changed
> netif: IP address of interface  set to 127.0.0.1
> netif: netmask of interface  set to 255.0.0.0
> netif: GW address of interface  set to 127.0.0.1
> netif: added interface lo IP addr 127.0.0.1 netmask 255.0.0.0 gw 127.0.0.1
> tcp_bind: bind to port 80
> 
> 
> Am i doing something wrong?
> 
>         Thanks
>                 Andrew