STM32F446RETx_FLASH.ld

/*
*****************************************************************************
**

**  File        : LinkerScript.ld
**
**  Abstract    : Linker script for STM32F446RETx Device with
**                512KByte FLASH, 128KByte RAM
**
**                Set heap size, stack size and stack location according
**                to application requirements.
**
**                Set memory bank area and size if external memory is used.
**
**  Target      : STMicroelectronics STM32
**
**
**  Distribution: The file is distributed as is, without any warranty
**                of any kind.
**
**  (c)Copyright Ac6.
**  You may use this file as-is or modify it according to the needs of your
**  project. Distribution of this file (unmodified or modified) is not
**  permitted. Ac6 permit registered System Workbench for MCU users the
**  rights to distribute the assembled, compiled & linked contents of this
**  file as part of an application binary file, provided that it is built
**  using the System Workbench for MCU toolchain.
**
*****************************************************************************
*/

/* Entry Point */
ENTRY(Reset_Handler)

/* Highest address of the user mode stack */
_estack = 0x20020000;    /* end of RAM */
/* Generate a link error if heap and stack don't fit into RAM */
_Min_Heap_Size  = 0x400;     /* required amount of heap  */
_Min_Stack_Size = 0xc00;     /* required amount of stack */

/* Specify the memory areas */
MEMORY
{
RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = 128K
FLASH (rx)      : ORIGIN = 0x8000000, LENGTH = 512K
}

/* 
   variables for internal use 
   the first 4KB of FLASH is used to place privileged functions,
   should be modified to fit the reguirement of your application
*/
_Privileged_Code_Region_Size  = 16K;
_Privileged_Data_Region_Size  = 512 - 8;
/* start / end of each region */
__code_segment_start__ = ORIGIN(FLASH);
__code_segment_end__   = __code_segment_start__ + LENGTH(FLASH);
__SRAM_segment_start__ = ORIGIN(RAM);
__SRAM_segment_end__   = __SRAM_segment_start__ + LENGTH(RAM);

__privileged_code_start__   = ORIGIN(FLASH);
__privileged_code_end__     = ORIGIN(FLASH) + _Privileged_Code_Region_Size;
__privileged_data_start__ = ORIGIN(RAM) ;
__privileged_data_end__   = ORIGIN(RAM) + _Privileged_Data_Region_Size ;


/* Define output sections */
SECTIONS
{
  /* The startup code goes first into FLASH */
  .isr_vector :
  {
    . = ALIGN(4);
    KEEP(*(.isr_vector)) /* Startup code */
    . = ALIGN(4);
  } >FLASH

  /* preserve first few bytes for kernel data */
  privileged_functions :
  {
      *(privileged_functions)
      __privileged_code_actual_end__ = . ;
      . = _Privileged_Code_Region_Size;
  } > FLASH

  /* The program code and other data goes into FLASH */
  .text :
  {
    . = ALIGN(4);
    *(.text)           /* .text sections (code) */
    *(.text*)          /* .text* sections (code) */
    *(.glue_7)         /* glue arm to thumb code */
    *(.glue_7t)        /* glue thumb to arm code */
    *(.eh_frame)

    KEEP (*(.init))
    KEEP (*(.fini))

    . = ALIGN(4);
    _etext = .;        /* define a global symbols at end of code */
  } >FLASH

  /* Constant data goes into FLASH */
  .rodata :
  {
    . = ALIGN(4);
    *(.rodata)         /* .rodata sections (constants, strings, etc.) */
    *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
    . = ALIGN(4);
  } >FLASH

  .ARM.extab   : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH
  .ARM : {
    __exidx_start = .;
    *(.ARM.exidx*)
    __exidx_end = .;
  } >FLASH

  .preinit_array     :
  {
    PROVIDE_HIDDEN (__preinit_array_start = .);
    KEEP (*(.preinit_array*))
    PROVIDE_HIDDEN (__preinit_array_end = .);
  } >FLASH
  .init_array :
  {
    PROVIDE_HIDDEN (__init_array_start = .);
    KEEP (*(SORT(.init_array.*)))
    KEEP (*(.init_array*))
    PROVIDE_HIDDEN (__init_array_end = .);
  } >FLASH
  .fini_array :
  {
    PROVIDE_HIDDEN (__fini_array_start = .);
    KEEP (*(SORT(.fini_array.*)))
    KEEP (*(.fini_array*))
    PROVIDE_HIDDEN (__fini_array_end = .);
  } >FLASH


  /* used by the startup to initialize data */
  _sidata = LOADADDR(.data); 

  /* Initialized data sections goes into RAM, load LMA copy after code */
  .data : 
  {
      . = ALIGN(4);
      _sdata = .;        /* create a global symbol at data start */

      /* few of kernel data have initialized value, that's why it is placed between _sdata and _edata  */
      *(privileged_data)
      /* now the beginning part of .data is used to store the kernel data */
      __privileged_data_actual_end__ = . ;
      . = _Privileged_Data_Region_Size;

      /* deliberately place privileged heap immediately after privileged kernel data, for address alignment */
      . = ALIGN(4);
      *(privileged_heap)

      . = ALIGN(64);
      __unpriv_data_start__   = . ;
      *(.data)           /* .data sections */
      *(.data*)          /* .data* sections */

      . = ALIGN(4);
      _edata = .;        /* define a global symbol at data end */
  } >RAM AT> FLASH

  
  /* Uninitialized data section */
  . = ALIGN(4);
  .bss :
  {
    /* This is used by the startup in order to initialize the .bss secion */
    _sbss = .;         /* define a global symbol at bss start */
    __bss_start__ = _sbss;
    *(.bss)
    *(.bss*)
    *(COMMON)

    . = ALIGN(4);
    _ebss = .;         /* define a global symbol at bss end */
    __bss_end__ = _ebss;
  } >RAM

  /* User_heap_stack section, used to check that there is enough RAM left */
  ._user_heap_stack :
  {
    . = ALIGN(8);
    PROVIDE ( end = . );
    PROVIDE ( _end = . );
    . = ALIGN(64);
    . = . + _Min_Heap_Size;
    . = . + _Min_Stack_Size;
    . = ALIGN(8);
    __unpriv_data_end__   = . ;
  } >RAM

  

  /* Remove information from the standard libraries */
  /DISCARD/ :
  {
    libc.a ( * )
    libm.a ( * )
    libgcc.a ( * )
  }

  .ARM.attributes 0 : { *(.ARM.attributes) }
}