URL:
<
http://savannah.nongnu.org/patch/?6966>
Summary: Moving the heap into a user defined section
Project: lwIP - A Lightweight TCP/IP stack
Submitted by: iordan_neshev
Submitted on: Fri 30 Oct 2009 04:20:05 PM GMT
Category: None
Priority: 5 - Normal
Status: None
Privacy: Public
Assigned to: None
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
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Details:
This is my suggestion how to move the heap with GCC.
It does not affect the current code if a section is not defined.
This should go in mem.c (above the heap declaration)
/** Defining this allows the heap to be placed in a user-defined
linker section (e.g. EXTERNAL RAM) */
#ifndef HEAP_SECT_PRE
#define HEAP_SECT_PRE
#endif /* HEAP_SECT_PRE */
/** Defining this allows the heap to be placed in a user-defined
linker section (e.g. EXTERNAL RAM) */
#ifndef HEAP_SECT_POST
#define HEAP_SECT_POST
#endif /* HEAP_SECT_POST */
mem.c, line 175: change
static u8_t ram_heap[MEM_SIZE_ALIGNED + (2*SIZEOF_STRUCT_MEM) +
MEM_ALIGNMENT];
to
static HEAP_SECT_PRE u8_t ram_heap[MEM_SIZE_ALIGNED + (2*SIZEOF_STRUCT_MEM) +
MEM_ALIGNMENT] HEAP_SECT_POST;
We may add a note how to define the section
/** Place this in cc.h to tell GCC to place the heap in section .externalram:
#define HEAP_SECT_PRE(/POST) _attribute_ ((section (".externalram")))
*/
Alternatively, the two #ifndef-#define-#endifs can be placed in opt.h. Then
the _atribute_ would go to lwipopts.h
Unfortunately, this is not easily compatible with #pragma-s
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