LinkerScript - stm32_flash.ld

/* ***************************************************************************** ** ** File : stm32_flash.ld ** ** Abstract : Linker script for STM32F207 Device with ** 1MByte FLASH, 128KByte SRAM ** ** 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 : Eclipse with CDT plugin and GCC compiler from CodeSourcery ** ** Author Date Comment **~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ** T.Kamenicky 24/06/11 Upravil kod stazen z netu ** T.Kamenicky 13/10/11 Predelal na STM32F2 ** T.Kamenicky 29/11/11 Pridal podporu externi SRAM ** ***************************************************************************** */ /* Entry Point */ /* This define entry point for linker, this address is used for CPU too as absolute first function */ ENTRY(Reset_Handler) /* Highest address of the user mode stack, _estack is end of stack */ _estack = 0x20020000; /* end of 128K RAM */ /* Generate a link error if heap and stack don't fit into RAM */ /* Heap is zero because we use own malloc implementation. The amount of heap is calculated * from free space after compilation, see last section for RAM area */ _Min_Heap_Size = 0x0; /* required amount of heap */ /* This stack is used for main function. If FreeRTOS is used this stack is used by OS itself. */ /* The size of stack for tasks is defined in freertos config file and when creating the task. */ _Min_Stack_Size = 0x600; /* required amount of stack */ /* Specify the memory areas */ MEMORY { FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 1022K /* This is main program area */ FACTORY_VAR(rx) : ORIGIN = 0x080FF800, LENGTH = 2K /* This area is used for factory values, such as MAC address, ID...etc */ RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 128K /* This is RAM area */ FSMC_SRAM (rx) : ORIGIN = 0x64000000, LENGTH = 2048K /* This is useful for external memory, like thru FSMC peripheral */ } /* Library configurations */ GROUP(libgcc.a libc.a libm.a libnosys.a) /* 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 */ ENTRY(Reset_Handler) 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 names a section that contains exception unwinding information. See EHABI for details. */ /* .ARM.exidx names a section that contains index entries for section unwinding. See EHABI for details. */ .ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH .ARM : { __exidx_start = .; *(.ARM.exidx*) __exidx_end = .; } >FLASH /* Is used for compiler information, which is located only in elf file */ .ARM.attributes 0 : { *(.ARM.attributes) } /* Those sections is used for initializing dynamic objects used in C++ */ .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 as memory location to initialize data */ /* from this point the content of flash is copied to ram */ _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 _SRAM_data = _sidata + _edata - _sdata; /* Second part of inicialized section goes into SRAM conected thru FSMC */ /* FSMC_SRAM section, code must be located here explicitly */ /* unsigned long int __attribute__ ((section (".sram_data"))) my_initialized_number = 0xAABBCCDD; */ .fsmc_sram_data : AT ( _SRAM_data ) { . = ALIGN(4); _iSRAM_data = .; *(.sram_data) *(.sram_data*) . = ALIGN(4); _iSRAM_data_end = .; } >FSMC_SRAM .fsmc_sram_bss : AT ( _iSRAM_data_end ) { _iSRAM_null_data = .; *(.sram_bss) *(.sram_bss*) . = ALIGN(4); _iSRAM_null_data_end = .; } >FSMC_SRAM .fsmc_sram_perma : AT ( _iSRAM_null_data_end ) { _iSRAM_perma_data = .; *(.sram_perma) *(.sram_perma*) . = ALIGN(4); _iSRAM_perma_data_end = .; } >FSMC_SRAM /* Uninitialized data section */ . = ALIGN(4); .bss : AT ( _edata ) { /* 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 /* Those numbers are used for SRAM init */ PROVIDE ( _linker_sram_start = _iSRAM_data ); PROVIDE ( _linker_sram_data_end = _iSRAM_data_end ); PROVIDE ( _linker_sram_end = _iSRAM_null_data_end ); PROVIDE ( _linker_sram_inits = _SRAM_data ); /* Those numbers are used for malloc and sbrk functions */ PROVIDE ( _linker_memory_start = _sdata ); PROVIDE ( _linker_heap_start = _ebss ); PROVIDE ( _linker_heap_end = (_estack - _Min_Stack_Size) ); PROVIDE ( _linker_memory_end = _estack ); PROVIDE ( _end = _ebss ); /* User_heap_stack section, used to check that there is enough RAM left */ ._user_heap_stack : AT ( _linker_heap_end ) { . = ALIGN(4); . = . + _Min_Heap_Size; . = . + _Min_Stack_Size; . = ALIGN(4); } >RAM /* FLASH memory area for factory default values */ /* Example of usage: extern int foo(void) __attribute__ ((section (".fvtext"))); */ /* unsigned long int my_factory_number_changed_in_production = 0xAABBCCDD __attribute__ ((section (".fvrodata"))); */ .factory_values : { . = ALIGN(4); *(.fvtext) /* .fvtext sections (code) */ *(.fvtext*) /* .fvtext* sections (code) */ *(.fvrodata) /* read-only data (constants) */ *(.fvrodata*) . = ALIGN(4); } >FACTORY_VAR /* Remove information from the standard libraries */ /DISCARD/ : { libc.a ( * ) libm.a ( * ) libgcc.a ( * ) } }