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

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--- Comment #7 from Sergei Gavrikov <sergei.gavrikov@gmail.com> 2011-01-24 12:45:58 GMT ---
Ilia, IMO, new CDL entries in Attachment 1094 look too complex. As far as I
could understand you should manage only MEM_SECTION definition. May be to use
something more simple in lwip_net.cdl, like below (alone option):

cdl_option CYGOPT_LWIP_MEM_SPEC_SECTION {
    display         "Use specified section"
    requires        CYGINT_LWIP_MEM_SECTIONING
    active_if       CYGIMP_LWIP_MEM_ATTR_SECTION
    default_value   0
}

It requires one interface CYGINT_LWIP_MEM_SECTIONING which can be implemented
in HAL (so, the option is active if that is implemented
CYGIMP_LWIP_MEM_ATTR_SECTION will be true).

For lwipopts.h I would put something like this

#if CYGOPT_LWIP_MEM_SPEC_SECTION && CYGDAT_LWIP_MEM_SECTION_NAME
#include <cyg/infra/type.h>
#define MEM_SECTION CYGBLD_ATTRIB_SECTION(CYGDAT_LWIP_MEM_SECTION_NAME)
#else
#define MEM_SECTION
#endif

CYGDAT_LWIP_MEM_SECTION_NAME can be booldata flavor option in your platform CDL
(no complex concatenation, just name -- { ".foo" }.

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