[Bug 1001116] Instruct lwIP to use special section for buffers and heap.

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--- Comment #24 from Ilija Kocho <ilijak@siva.com.mk> 2011-01-30 17:38:53 GMT ---
(In reply to comment #22)
> Maybe this will be obsolete comment, but
> 
> (In reply to comment #18)
> > (In reply to comment #17)
> > Therefore i would prefer something that will not depend on ECM. One way is:
> > 
> >      cdl_option CYGOPT_LWIP_MEM_SECTION {
> >           ...
> >           default_value 1
> >           ...
> >      }
> 
> I disagreed with above, as for the most targets we will see *grayed* and
> *checked* box in CT:
> 
>   [x] Use additional memory section
> 
> To reduse mouse traffic you can use such a trick:
> 
>     cdl_option CYGOPT_LWIP_MEM_SECTION {
>         ...
>         default_value { is_substr(CYGDAT_LWIP_MEM_SECTION_NAME, ".") }
>         active_if     CYGDAT_LWIP_MEM_SECTION_NAME
> 
> The box will be unchecked until booldata in your HAL (CYGDAT_.*_NAME) is not
> proper section name. However, this was quickly tested only. 

I have noticed it, but I allowed to occur it since I have seen similar behavior
in some other CDLs.

Actually I tried something similar

     cdl_option CYGOPT_LWIP_MEM_SECTION {
         ...
         default_value is_active(CYGDAT_LWIP_MEM_SECTION_NAME)
         active_if     CYGDAT_LWIP_MEM_SECTION_NAME

But I'm not sure if it depends on the order the packages are processed/applied.
FYI it worked for my test case (select default template then add lwip).

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