stm32f429zi freertos hardfault

[PanMaltan]

Hello,

 

trying to port Miro Samek's example: https://github.com/QuantumLeaps/FreeACT - into my nucleo-F429ZI board.

As a reference there is project running on nucleo-h743zi

 

what i did:

changed all configs to be STM32F429zi valid, changed ld file, makefile, etc etc.

 

When running software (via debugger), unfortunatelly i got hardfault in this piece of code (rtos-port-part: port.c)

 

static void prvPortStartFirstTask( void )
{
 /* Start the first task. This also clears the bit that indicates the FPU is
 * in use in case the FPU was used before the scheduler was started - which
 * would otherwise result in the unnecessary leaving of space in the SVC stack
 * for lazy saving of FPU registers. */
 __asm volatile (
 " ldr r0, =0xE000ED08 	\n"/* Use the NVIC offset register to locate the stack. */
 " ldr r0, [r0] 			\n"
 " ldr r0, [r0] 			\n"
 " msr msp, r0			\n"/* Set the msp back to the start of the stack. */
 " mov r0, #0			\n"/* Clear the bit that indicates the FPU is in use, see comment above. */
 " msr control, r0		\n"
 " cpsie i				\n"/* Globally enable interrupts. */
 " cpsie f				\n"
 " dsb					\n"
 " isb					\n"
 " svc 0					\n"/* System call to start first task. */
 " nop					\n"
 " .ltorg				\n"
 );
}

after dissamebly looks like this:

 

after i step to next line, r0=0x0

when i want to go next line, i end up in hardfault handler:

 

CFSR, HFSR:

0xe000ed28: 0x00000082 0x40000000 0x00000001 0x00000000

reading CFRS i know that  Data Access Violation occurred but my question is why?

 

i already read https://www.freertos.org/Documentation/02-Kernel/03-Supported-devices/04-Demos/ARM-Cortex/RTOS-Cortex-M3-M4 and setup prios as (file FreeRTOSConfig.h):

 

 

#define configKERNEL_INTERRUPT_PRIORITY ( 15 << 4 ) /* Priority 7, or 255 as only the top three bits are implemented. This is the lowest priority. */
/* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!
See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
#define configMAX_SYSCALL_INTERRUPT_PRIORITY ( 5 << 4 ) /* Priority 5, or 160 as only the top three bits are implemented. */

 

but it didnt help.

 

ld is relatively simple(just modified from other nucleo project and adjusted to F429zi specific): 

 

/*****************************************************************************
* Product: Linker script for STM32F429zi, GNU-ARM linker

*****************************************************************************/
OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(Reset_Handler) /* entry Point */

MEMORY { /* memory map of STM32F429ZI */
 CCMRAM (xrw) : ORIGIN = 0x10000000, LENGTH = 64K
 RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 192K
 ROM (rx) : ORIGIN = 0x08000000, LENGTH = 2048K
}

/* The size of the stack used by the application. NOTE: you need to adjust */
STACK_SIZE = 4096;

/* The size of the heap used by the application. NOTE: you need to adjust */
HEAP_SIZE = 1024;

SECTIONS {

 .isr_vector : { /* the vector table goes FIRST into ROM */
 KEEP(*(.isr_vector)) /* vector table */
 . = ALIGN(4);
 } >ROM

 .text : { /* code and constants */
 . = ALIGN(4);
 *(.text) /* .text sections (code) */
 *(.text*) /* .text* sections (code) */
 *(.rodata) /* .rodata sections (constants, strings, etc.) */
 *(.rodata*) /* .rodata* sections (constants, strings, etc.) */

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

 . = ALIGN(4);
 } >ROM

 .preinit_array : {
 PROVIDE_HIDDEN (__preinit_array_start = .);
 KEEP (*(.preinit_array*))
 PROVIDE_HIDDEN (__preinit_array_end = .);
 } >ROM

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

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

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

 .stack : {
 __stack_start__ = .;
 . = . + STACK_SIZE;
 . = ALIGN(4);
 __stack_end__ = .;
 } >RAM

 .data : AT (_etext) {
 __data_load = LOADADDR (.data);
 __data_start = .;
 *(.data) /* .data sections */
 *(.data*) /* .data* sections */
 . = ALIGN(4);
 __data_end__ = .;
 _edata = __data_end__;
 } >RAM

 _siccmram = LOADADDR(.ccmram);

 /* CCM-RAM section
 *
 * IMPORTANT NOTE!
 * If initialized variables will be placed in this section,
 * the startup code needs to be modified to copy the init-values.
 */
 .ccmram :
 {
 . = ALIGN(4);
 _sccmram = .; /* create a global symbol at ccmram start */
 *(.ccmram)
 *(.ccmram*)

 . = ALIGN(4);
 _eccmram = .; /* create a global symbol at ccmram end */
 } >CCMRAM AT> RAM


 .bss : {
 __bss_start__ = .;
 *(.bss)
 *(.bss*)
 *(COMMON)
 . = ALIGN(4);
 _ebss = .; /* define a global symbol at bss end */
 __bss_end__ = .;
 } >RAM

 __exidx_start = .;
 .ARM.exidx : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) } >RAM
 __exidx_end = .;

 PROVIDE ( end = _ebss );
 PROVIDE ( _end = _ebss );
 PROVIDE ( __end__ = _ebss );

 .heap : {
 __heap_start__ = .;
 . = . + HEAP_SIZE;
 . = ALIGN(4);
 __heap_end__ = .;
 } >RAM

 /* Remove information from the standard libraries */
 /DISCARD/ : {
 libc.a ( * )
 libm.a ( * )
 libgcc.a ( * )
 }
}

 

 

any support appriciated!