Hi

I am working with the cortex - m0plus controller. when we optimize the code to -O2 we are getting the hardfault during the debug.

static tskTCB *prvAllocateTCBAndStack( unsigned short usStackDepth, portSTACK_TYPE *puxStackBuffer ) { tskTCB *pxNewTCB;

/* Allocate space for the TCB.  Where the memory comes from depends on
the implementation of the port malloc function. */
pxNewTCB = ( tskTCB * ) pvPortMalloc( sizeof( tskTCB ) );

if( pxNewTCB != NULL )
{
	/* Allocate space for the stack used by the task being created.
	The base of the stack memory stored in the TCB so the task can
	be deleted later if required. */
	pxNewTCB->pxStack = ( portSTACK_TYPE * ) pvPortMallocAligned( ( ( ( size_t )usStackDepth ) * sizeof( portSTACK_TYPE ) ), puxStackBuffer );

	if( pxNewTCB->pxStack == NULL )
	{
		/* Could not allocate the stack.  Delete the allocated TCB. */
		vPortFree( pxNewTCB );
		pxNewTCB = NULL;
	}
	else
	{

		/* Just to help debugging. */
		memset( pxNewTCB->pxStack, ( int ) tskSTACK_FILL_BYTE, ( size_t ) usStackDepth * sizeof( portSTACK_TYPE ) );
	}
}

return pxNewTCB;

}

I am getting the hardfault in the else part...

I just tried this GCC Cortex-M0+ project with optimisations set to -O0, -O2 and -O3, and in each case the code executed as expected.

http://www.freertos.org/AtmelSAMD20RTOS.html

Your code appears to be crashing when it calls a library function, not when it is calling a FreeRTOS function. You could try writing your own simple memset() implementation to see if that helps.

Regards.