How do I specify memory region in STM32F103RB Micro-Controller?

Posted on June 09, 2018 at 12:10

So, I have specified memory region of 1204 bytes starting from

0x3FFFFB44 

inside Stm32Flash.ld file. This is my Flash.ld file after configuring it.

/*

*****************************************************************************

**

** File : stm32_flash.ld

**

** Abstract : Linker script for STM32F103VB Device with

** 128KByte FLASH, 20KByte 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

**

** Environment : Atollic TrueSTUDIO(R)

**

** Distribution: The file is distributed “as is,� without any warranty

** of any kind.

**

** (c)Copyright Atollic AB.

** 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. Atollic AB permit registered Atollic TrueSTUDIO(R) 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 Atollic TrueSTUDIO(R) toolchain.

**

*****************************************************************************

*/

/* Entry Point */

ENTRY(Reset_Handler)

/* Highest address of the user mode stack */

_estack = 0x20005000; /* end of 20K RAM */

/* Generate a link error if heap and stack don't fit into RAM */

_Min_Heap_Size = 0; /* required amount of heap */

_Min_Stack_Size = 0x100; /* required amount of stack */

/* Specify the memory areas */

MEMORY

{

FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 128K

RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 20K

SRAM (rwx) : ORIGIN = 0x3FFFFB44, LENGTH = 1204B

MEMORY_B1 (rx) : ORIGIN = 0x60000000, LENGTH = 0K

}

/* Define output sections */

SECTIONS

{

/* The startup code goes first into FLASH */

.isr_vector :

{

. = ALIGN(4);

KEEP(*(.isr_vector)) /* Startup code */

. = ALIGN(4);

} >FLASH

/* The program code and other data goes into FLASH */

.text :

{

. = ALIGN(4);

*(.text) /* .text sections (code) */

*(.text*) /* .text* sections (code) */

*(.rodata) /* .rodata sections (constants, strings, etc.) */

*(.rodata*) /* .rodata* sections (constants, strings, etc.) */

*(.glue_7) /* glue arm to thumb code */

*(.glue_7t) /* glue thumb to arm code */

KEEP (*(.init))

KEEP (*(.fini))

. = ALIGN(4);

_etext = .; /* define a global symbols at end of code */

} >FLASH

.ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH

.ARM : {

__exidx_start = .;

*(.ARM.exidx*)

__exidx_end = .;

} >FLASH

.ARM.attributes : { *(.ARM.attributes) } > 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 (*(.fini_array*))

KEEP (*(SORT(.fini_array.*)))

PROVIDE_HIDDEN (__fini_array_end = .);

} >FLASH

/* used by the startup to initialize data */

_sidata = .;

/* Initialized data sections goes into RAM, load LMA copy after code */

.data : AT ( _sidata )

{

. = ALIGN(4);

_sdata = .; /* create a global symbol at data start */

*(.data) /* .data sections */

*(.data*) /* .data* sections */

. = ALIGN(4);

_edata = .; /* define a global symbol at data end */

} >RAM

/* 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

PROVIDE ( end = _ebss );

PROVIDE ( _end = _ebss );

/* User_heap_stack section, used to check that there is enough RAM left */

._user_heap_stack :

{

. = ALIGN(4);

. = . + _Min_Heap_Size;

. = . + _Min_Stack_Size;

. = ALIGN(4);

} >RAM

/* MEMORY_bank1 section, code must be located here explicitly */

/* Example: extern int foo(void) __attribute__ ((section ('.mb1text'))); */

.memory_b1_text :

{

*(.mb1text) /* .mb1text sections (code) */

*(.mb1text*) /* .mb1text* sections (code) */

*(.mb1rodata) /* read-only data (constants) */

*(.mb1rodata*)

} >MEMORY_B1

/* Remove information from the standard libraries */

/DISCARD/ :

{

libc.a ( * )

libm.a ( * )

libgcc.a ( * )

}

}

Now at this point, I don't need to specify memory manually inside 

Memory Map dialog, Right?

When I run the program it still gives me the access violation at 0x3FFFFB44. Am I configuring the Flash.ld file correctly?