[ECOS] ecos + lwip

Mandeep Sandhu mandeepsandhu.chd@gmail.com
Wed Sep 2 13:19:00 GMT 2009


On Wed, Sep 2, 2009 at 11:45 AM, Mandeep
Sandhu<mandeepsandhu.chd@gmail.com> wrote:
>>
>> You need to wait for cyg_lwip_sequential_init() to return before creating
>> user threads.
>
> That should be happening since I'm calling cyg_lwip_sequential_init() before
> even creating my own thread!
>
> <snip>
>
> cyg_lwip_sequential_init();
>
> cyg_lwip_thread_new( "My thread", m_main, (void *)"My thread",
> my_stack, 0x1000, 5 );
> ...
> ...
> <snip>
>
> I'll enable more debugs to see where it's getting stuck.

Hi Simon,

I think I've partially fixed the issue. While going through the default config
I noticed that the TCPIP thread's default priority is set to 8. Which was lower
than my threads prio - 5.

After changing it to 2, it's able to find the interface (et0) with all
the right settings.

Now another problem has cropped up! :) Sorry.

My app's actually a DHCP server. So it receives DHCP packets with 0.0.0.0
as the src IP. However, the stack is dropping them with the following message:

ip_input: iphdr->dest 0xffffffff netif->ip_addr 0x101010b (0xffffff,
0x1010b, 0xff000000)
ip_input: packet accepted on interface et
ip_input: packet source is not valid.

I've enabled the following in my config:

* Support broadcast filter
* Receive support

Is anything else needed?

Just one more thing:

While tracing the path from  cyg_lwip_sequential_init() to see what
all happens, I saw that
we end up calling lwip_init() twice!

Once in cyg_lwip_sequential_init() and then again in tcpip_init().

Why do we do it twice? The only function called between these 2 calls is
cyg_semaphore_init().

I think we can remove one of these. Or am I missing something?

Thanks,
-mandeep

>
>>
>> Simon
>>
>

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