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Re: [lwip-users] port LwIP 1.3.0 to uC/OS-II with powerpc

From: Kevin
Subject: Re: [lwip-users] port LwIP 1.3.0 to uC/OS-II with powerpc
Date: Mon, 29 Jun 2009 14:45:29 -0400

Hi, Simon:

Thank you very much for the guidance: I am almost get there following your suggestion.

One thing I am concerning is that I got lots of warning associating with "PACK_STRUCT_FIELD".

I checked the cc.h and find this line:
#define PACK_STRUCT_FIELD(x) x

I think this line doesn't do any packing on 'x' as it claimed. In my opinion, this line should be:
#define PACK_STRUCT_FIELD(x) x __attribute__((packed))

However, if I change it this way, I got lots of warnings as below:

/lwip130/src/lwip-1.3.0/src/include/ipv4/lwip/ip.h:135: warning: 'packed' attribute ignored for field of type 'struct ip_addr'
/lwip130/src/lwip-1.3.0/src/include/ipv4/lwip/ip.h:136: warning: 'packed' attribute ignored for field of type 'struct ip_addr'

Could you please give me a help on why this warning and how I can get rid of it?

I am using powerpc-eabi-gcc and powerpc405.

Thank you!


On Sun, Jun 28, 2009 at 3:34 AM, address@hidden <address@hidden> wrote:
Kevin wrote:
Hi, Simon:

You mentioned "there are ports for uC/OS-II available on the web", are they ports for lwip130? May I have a link to this port?

I found one for lwip110 and since lwip130 changed a lot from lwip110, I am not sure how hard to move from 110 to 130 port on uc/os-ii. Do I have to create new sys_arch.c? Any need to touch api_lib.c and api_msg.c?

Oh, I didn't think of that. I used the port myself, but that was with 1.2.0 and I think I didn't have to change anything. You might have to change sys_arch.c and -.h as well as cc.h. For a port, you *never* must change any file of the core lwIP code, so no, you don't need to touch api_lib.c and api_msg.c!

I would just try to compile with the 1.1.0-port and see how far you get: the compiler should tell you where the old port doesn't fit the new lwIP code.


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