Question
Linker file with SBSFU
We have our application running with the SBSFU feature and are not sure if our linker files are designed correctly.
In our application linker file, the CCMRAM is used :
/* Entry Point */
ENTRY(Reset_Handler)
/* Specify the memory areas */
MEMORY
{
region_SLOT_0 (rx) : ORIGIN = 0x08060000, LENGTH = 0x200
ISR_VECTOR : ORIGIN = 0x08060200, LENGTH = 0x200
FLASH (rx) : ORIGIN = 0x08060400, LENGTH = 0x3FC00
RAM (xrw) : ORIGIN = 0x20001900, LENGTH = 0x1A700
SE_region_SRAM1 (xrw) : ORIGIN = 0x20000000, LENGTH = 0
SE_Key_region_ROM (rx) : ORIGIN = 0x08011800, LENGTH = 0
SE_IF_region_ROM (rx) : ORIGIN = 0x0800D200, LENGTH = 0x500
CCMRAM (rw) : ORIGIN = 0x10000000, LENGTH = 64K
}
/* Highest address of the user mode stack */
_estack = ORIGIN(CCMRAM) + LENGTH(CCMRAM);
/* Generate a link error if heap and stack don't fit into CCMRAM */
_Min_Heap_Size = 0x200; /* required amount of heap */
_Min_Stack_Size = 0x400; /* required amount of stack */
__ICFEDIT_region_SLOT_0_start__ = ORIGIN(region_SLOT_0);
__ICFEDIT_SE_region_SRAM1_start__ = ORIGIN(SE_region_SRAM1);
__ICFEDIT_SE_Key_region_ROM_start__ = ORIGIN(SE_Key_region_ROM);
__ICFEDIT_intvec_start__ = ORIGIN(ISR_VECTOR);
/* Define output sections */
SECTIONS
{
/* The startup code goes first into FLASH */
.isr_vector :
{
. = ALIGN(8);
KEEP(*(.isr_vector)) /* Startup code */
. = ALIGN(8);
} >ISR_VECTOR
.SE_IF_Code :
{
KEEP(*se_interface_app.o (.text .text*)) /* Se Interface code */
} >SE_IF_region_ROM
/* The program code and other data goes into FLASH */
.text :
{
. = ALIGN(8);
*(.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(8);
_etext = .; /* define a global symbols at end of code */
} >FLASH
/* Constant data goes into FLASH */
.rodata :
{
. = ALIGN(8);
*(.rodata) /* .rodata sections (constants, strings, etc.) */
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
. = ALIGN(8);
} >FLASH
.ARM.extab :
{
. = ALIGN(8);
*(.ARM.extab* .gnu.linkonce.armextab.*)
. = ALIGN(8);
} >FLASH
.ARM : {
. = ALIGN(8);
__exidx_start = .;
*(.ARM.exidx*)
__exidx_end = .;
. = ALIGN(8);
} >FLASH
.preinit_array :
{
. = ALIGN(8);
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array*))
PROVIDE_HIDDEN (__preinit_array_end = .);
. = ALIGN(8);
} >FLASH
.init_array :
{
. = ALIGN(8);
PROVIDE_HIDDEN (__init_array_start = .);
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array*))
PROVIDE_HIDDEN (__init_array_end = .);
. = ALIGN(8);
} >FLASH
.fini_array :
{
. = ALIGN(8);
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP (*(SORT(.fini_array.*)))
KEEP (*(.fini_array*))
PROVIDE_HIDDEN (__fini_array_end = .);
. = ALIGN(8);
} >FLASH
/* used by the startup to initialize data */
_sidata = LOADADDR(.data);
/* Initialized data sections goes into RAM, load LMA copy after code */
.data :
{
. = ALIGN(8);
_sdata = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
. = ALIGN(8);
_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 = . );
. = . + _Min_Heap_Size;
. = . + _Min_Stack_Size;
. = ALIGN(8);
} >RAM
/* Remove information from the standard libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}
.ARM.attributes 0 : { *(.ARM.attributes) }
}Is it ok to use only the CCMRAM for the application or is this configuration sub optimal?