/*
******************************************************************************
**
** @file        : STM32F446XX_ETHCOMMS_OCTOPUS_BL.ld
**
** @brief       : Linker script for STM32F446 (Octopus Pro)
**                Remora-ETH with Bootloader
**
** Flash layout:
**   Sector 0-1 : Bootloader (32 KB)
**   Sector 2   : JSON Upload (16 KB)
**   Sector 3   : JSON Storage (16 KB)
**   Sector 4+  : Application
**
******************************************************************************
*/


/* Entry Point */
ENTRY(Reset_Handler)


/* Stack top */
_estack = ORIGIN(RAM) + LENGTH(RAM);


/* Heap & Stack */
_Min_Heap_Size  = 0x2000;  /* 8 KB */
_Min_Stack_Size = 0x400;   /* 2 KB */


/* Flash sizes */
_FLASH_TOTAL_SIZE        = 512K;
_FLASH_BOOTLOADER_SIZE   = 32K;   /* Sector 0 + 1 */
_FLASH_JSON_UPLOAD_SIZE  = 16K;   /* Sector 2 */
_FLASH_JSON_STORAGE_SIZE = 16K;   /* Sector 3 */


_PGM_FLASH_AVAILABLE_SIZE =
  _FLASH_TOTAL_SIZE
- _FLASH_BOOTLOADER_SIZE
- _FLASH_JSON_UPLOAD_SIZE
- _FLASH_JSON_STORAGE_SIZE;


/* Memory regions */
MEMORY
{
  RAM          (xrw) : ORIGIN = 0x20000000, LENGTH = 128K


  FLASH_BOOT   (rx)  : ORIGIN = 0x08000000, LENGTH = _FLASH_BOOTLOADER_SIZE
  JSON_UPLOAD  (rx)  : ORIGIN = 0x08008000, LENGTH = _FLASH_JSON_UPLOAD_SIZE
  JSON_STORAGE (rx)  : ORIGIN = 0x0800C000, LENGTH = _FLASH_JSON_STORAGE_SIZE
  FLASH_PGM    (rx)  : ORIGIN = 0x08010000, LENGTH = _PGM_FLASH_AVAILABLE_SIZE
}


/* Application vector table location */
_FLASH_VectorTable = ORIGIN(FLASH_PGM);


/* JSON symbols for Remora */
_ls_json_upload_start  = ORIGIN(JSON_UPLOAD);
_ls_json_upload_end    = ORIGIN(JSON_UPLOAD)  + LENGTH(JSON_UPLOAD);
_ls_json_storage_start = ORIGIN(JSON_STORAGE);
_ls_json_storage_end   = ORIGIN(JSON_STORAGE) + LENGTH(JSON_STORAGE);


_ls_json_upload_sector  = 2;  /* FLASH_SECTOR_2 */
_ls_json_storage_sector = 3;  /* FLASH_SECTOR_3 */


/* Sections */
SECTIONS
{
  /* Interrupt vector table */
  .isr_vector :
  {
    . = ALIGN(4);
    KEEP(*(.isr_vector))
    . = ALIGN(4);
  } > FLASH_PGM


  /* JSON upload region */
  .json_upload (NOLOAD) :
  {
    . = ALIGN(4);
    KEEP(*(.json_upload))
    KEEP(*(.json_upload.*))
    . = ALIGN(4);
  } > JSON_UPLOAD


  /* JSON storage region */
  .json_storage (NOLOAD) :
  {
    . = ALIGN(4);
    KEEP(*(.json_storage))
    KEEP(*(.json_storage.*))
    . = ALIGN(4);
  } > JSON_STORAGE


  /* Program code */
  .text :
  {
    . = ALIGN(4);
    *(.text)
    *(.text*)
    *(.glue_7)
    *(.glue_7t)
    *(.eh_frame)


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


    . = ALIGN(4);
    _etext = .;
  } > FLASH_PGM


  /* Read-only data */
  .rodata :
  {
    . = ALIGN(4);
    *(.rodata)
    *(.rodata*)
    . = ALIGN(4);
  } > FLASH_PGM


  .ARM.extab :
  {
    . = ALIGN(4);
    *(.ARM.extab* .gnu.linkonce.armextab.*)
    . = ALIGN(4);
  } > FLASH_PGM


  .ARM :
  {
    . = ALIGN(4);
    __exidx_start = .;
    *(.ARM.exidx*)
    __exidx_end = .;
    . = ALIGN(4);
  } > FLASH_PGM


  .preinit_array :
  {
    . = ALIGN(4);
    PROVIDE_HIDDEN(__preinit_array_start = .);
    KEEP(*(.preinit_array*))
    PROVIDE_HIDDEN(__preinit_array_end = .);
    . = ALIGN(4);
  } > FLASH_PGM


  .init_array :
  {
    . = ALIGN(4);
    PROVIDE_HIDDEN(__init_array_start = .);
    KEEP(*(SORT(.init_array.*)))
    KEEP(*(.init_array*))
    PROVIDE_HIDDEN(__init_array_end = .);
    . = ALIGN(4);
  } > FLASH_PGM


  .fini_array :
  {
    . = ALIGN(4);
    PROVIDE_HIDDEN(__fini_array_start = .);
    KEEP(*(SORT(.fini_array.*)))
    KEEP(*(.fini_array*))
    PROVIDE_HIDDEN(__fini_array_end = .);
    . = ALIGN(4);
  } > FLASH_PGM


  /* Data copy source */
  _sidata = LOADADDR(.data);


  /* Initialized data */
  .data :
  {
    . = ALIGN(4);
    _sdata = .;
    *(.data)
    *(.data*)
    *(.RamFunc)
    *(.RamFunc*)
    . = ALIGN(4);
    _edata = .;
  } > RAM AT > FLASH_PGM


  /* BSS */
  .bss :
  {
    . = ALIGN(4);
    _sbss = .;
    __bss_start__ = _sbss;
    *(.bss)
    *(.bss*)
    *(COMMON)
    . = ALIGN(4);
    _ebss = .;
    __bss_end__ = _ebss;
  } > RAM


  /* Heap + Stack */
  ._user_heap_stack :
  {
    . = ALIGN(8);
    PROVIDE(end = .);
    PROVIDE(_end = .);
    . = . + _Min_Heap_Size;
    . = . + _Min_Stack_Size;
    . = ALIGN(8);
  } > RAM


  /* Strip unused libs */
  /DISCARD/ :
  {
    libc.a (*)
    libm.a (*)
    libgcc.a (*)
  }


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