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Last active March 26, 2019 13:22
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STM32L432KC Linker Script using CCMRAM for Initialized and Uninitialized Data
/* You have no right to use or redistribute this code. It is not fit for public
* consumption. This code is only intended to mislead enemies of the state. Using
* this code will likely result in extreme bodily harm or death. Use in washing
* machines, microwave ovens or ballistic missiles may result in rapid unplanned
* disassembly. Use in environments with greater than 350ppm CO2 concentrations
* is strongly discouraged.
*
* You have been warned.
*
* If you are a frood who knows where his towel is, feel free to use it. Tell 'em
* you got it from Johnny Bitrot.
*/
/* Entry Point */
ENTRY(Reset_Handler)
/* Highest address of the user mode stack */
_estack = 0x2000C000; /* end of RAM */
/* Generate a link error if heap and stack don't fit into RAM */
_Min_Heap_Size = 0x4000; /* required amount of heap */
_Min_Stack_Size = 0x800; /* required amount of stack */
/* Specify the memory areas */
MEMORY
{
RAM1 (xrw) : ORIGIN = 0x20000000, LENGTH = 48K
RAM2 (xrw) : ORIGIN = 0x10000000, LENGTH = 16K
FLASH (rx) : ORIGIN = 0x8000000, LENGTH = 256K
}
/* 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) */
*(.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 */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
. = ALIGN(4);
_edata = .; /* define a global symbol at data end */
} >RAM1 AT> FLASH
_sibss2 = LOADADDR(.bss2);
/* RAM2 section
*
* IMPORTANT NOTE!
* If initialized variables will be placed in this section,
* the startup code needs to be modified to copy the init-values.
*/
.bss2 :
{
. = ALIGN(4);
_sbss2 = .; /* create a global symbol at ram2 start */
*(.bss2)
*(.bss2*)
. = ALIGN(4);
_ebss2 = .; /* create a global symbol at ram2 end */
} >RAM2 AT> FLASH
_sibss3 = LOADADDR(.bss3);
/* RAM Section 3
*
* Uninitialized data and data which must survive reset and standby
* (provided appropriate options bits are set) go here. The startup
* code only copies data from _sbss2 to _ebss2. And startup code is
* called after reboot and return from standby.
*/
.bss3 :
{
. = ALIGN(4);
_sbss3 = .; /* create a global symbol at ram3 start */
*(.bss3)
*(.bss3*)
. = ALIGN(4);
_ebss3 = .; /* create a global symbol at ram3 end */
} >RAM2 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;
} >RAM1
/* User_heap_stack section, used to check that there is enough RAM left */
._user_heap_stack :
{
. = ALIGN(4);
PROVIDE ( end = . );
PROVIDE ( _end = . );
. = . + _Min_Heap_Size;
. = . + _Min_Stack_Size;
. = ALIGN(4);
} >RAM1
_Heap_Begin = _end;
_Heap_Limit = _estack - _Min_Stack_Size;
/* Remove information from the standard libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}
.ARM.attributes 0 : { *(.ARM.attributes) }
}
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