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STM32F2 linker script to emulate EEPROM

Question asked by rocca.stephane on May 10, 2015
Latest reply on May 11, 2015 by rocca.stephane
Hi all,

I try to test the ST example of EEPROM emulation (with 3 variables and page2 + Page3 usage).

I build it with success with GCC (EMBLOCKS), but it seems I can't assign the good value to isr vector. I tried a lot of solution with custom linker script, but no way : I can't reset the MCU after upload.

Any help appreciated please !!

/* ---------------------------------------------------------------------------- */
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/* Copyright (c) 2014, EmBlocks                                                 */
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/* this software without specific prior written permission.                     */
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/* DISCLAIMER:  THIS SOFTWARE IS PROVIDED BY EBLOCKS "AS IS" AND ANY EXPRESS OR */
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/* DISCLAIMED. IN NO EVENT SHALL EMBLOCKS BE LIABLE FOR ANY DIRECT, INDIRECT,   */
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/* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING         */
/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                           */
/* ---------------------------------------------------------------------------- */
 
/*------------------------------------------------------------------------------
 *      Linker script for running in internal FLASH on the STM32F215RE
 *----------------------------------------------------------------------------*/
 
  
  
  
OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
OUTPUT_ARCH(arm)
SEARCH_DIR(.)
 
 
/*
ROM  (rx) : ORIGIN = 0x08000000, LENGTH = 512K
ROM  (rx) : ORIGIN = 0x08010000, LENGTH = 448K
ROM  (rx) : ORIGIN = 0x08010000, LENGTH = 512K - 0x10000
ROM  (rx) : ORIGIN = 0x08020000, LENGTH = 320K : marche pas
 */
/* Memory Spaces Definitions */
MEMORY
{
    ROM  (rx) : ORIGIN = 0x08010000, LENGTH = 448K
    RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 128K
}
 
/* Linker script to place sections and symbol values. Should be used together
 * with other linker script that defines memory regions FLASH and RAM.
 * It references following symbols, which must be defined in code:
 *   Reset_Handler : Entry of reset handler
 *
 * It defines following symbols, which code can use without definition:
 *   __exidx_start
 *   __exidx_end
 *   __etext
 *   __data_start__
 *   __preinit_array_start
 *   __preinit_array_end
 *   __init_array_start
 *   __init_array_end
 *   __fini_array_start
 *   __fini_array_end
 *   __data_end__
 *   __bss_start__
 *   __bss_end__
 *   __end__
 *   end
 *   __HeapLimit
 *   __StackLimit
 *   __StackTop
 *   __stack
 */
 
 
SECTIONS
{
    .text :
    {
        KEEP(*(.isr_vector))
        *(.text*)
 
        KEEP(*(.init))
        KEEP(*(.fini))
 
        /* .ctors */
        *crtbegin.o(.ctors)
        *crtbegin?.o(.ctors)
        *(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
        *(SORT(.ctors.*))
        *(.ctors)
 
        /* .dtors */
        *crtbegin.o(.dtors)
        *crtbegin?.o(.dtors)
        *(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
        *(SORT(.dtors.*))
        *(.dtors)
 
        *(.rodata*)
 
        KEEP(*(.eh_frame*))
    } > ROM
 
    .ARM.extab :
    {
        *(.ARM.extab* .gnu.linkonce.armextab.*)
    } > ROM
 
    __exidx_start = .;
    .ARM.exidx :
    {
        *(.ARM.exidx* .gnu.linkonce.armexidx.*)
    } > ROM
    __exidx_end = .;
 
    __etext = .;
         
    .data : AT (__etext)
    {
        __data_start__ = .;
        *(vtable)
        *(.data*)
 
        . = ALIGN(4);
        /* preinit data */
        PROVIDE_HIDDEN (__preinit_array_start = .);
        KEEP(*(.preinit_array))
        PROVIDE_HIDDEN (__preinit_array_end = .);
 
        . = ALIGN(4);
        /* init data */
        PROVIDE_HIDDEN (__init_array_start = .);
        KEEP(*(SORT(.init_array.*)))
        KEEP(*(.init_array))
        PROVIDE_HIDDEN (__init_array_end = .);
 
 
        . = ALIGN(4);
        /* finit data */
        PROVIDE_HIDDEN (__fini_array_start = .);
        KEEP(*(SORT(.fini_array.*)))
        KEEP(*(.fini_array))
        PROVIDE_HIDDEN (__fini_array_end = .);
 
        . = ALIGN(4);
        /* All data end */
        __data_end__ = .;
 
    } > RAM
 
    .bss (NOLOAD):
    {
        __bss_start__ = .;
        *(.bss*)
        *(COMMON)
        __bss_end__ = .;
    } > RAM
     
    .heap (NOLOAD):
    {
        __end__ = .;
        end = __end__;
        *(.heap*)
        __HeapLimit = .;
    } > RAM
 
    /* .stack_dummy section doesn't contains any symbols. It is only
     * used for linker to calculate size of stack sections, and assign
     * values to stack symbols later */
    .stack_dummy (NOLOAD):
    {
        *(.stack)
    } > RAM
 
    /* Set stack top to end of RAM, and stack limit move down by
     * size of stack_dummy section */
    __StackTop = ORIGIN(RAM) + LENGTH(RAM);
    __StackLimit = __StackTop - SIZEOF(.stack_dummy);
    PROVIDE(__stack = __StackTop);
     
    /* Check if data + heap + stack exceeds RAM limit */
    ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
}

Other modifications : 
#define VECT_TAB_OFFSET  0x10000

Tx !

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