boot NIOS and FPGA from EPCS flash

These are my different functions used for the serial flash :

int epcs_open(void)
{
   int ret_code;
   int i;
   fd = alt_flash_open_dev("/dev/epcq_controller_avl_mem");
	if (fd== NULL)
	{
		printf("** Can't open flash device **\n\n");
	}else
	{
		printf("\n<----> Running Flash Tests <---->\n\r");
		printf("-Testing flash info retrieval...");
		ret_code = alt_get_flash_info(fd, &regions, &number_of_regions);
		//ret_code =alt_epcq_controller_get_info(fd, &regions, &number_of_regions);
		if (ret_code)
		{
			printf( "\nERROR: function alt_get_flash_info failed. ret_code %d\n",ret_code);
			goto finished;
		}
		printf("\n\rThis is NIOSII Board Designed by flash Logic\n\r");
		printf("Flash name %s\n\r",fd->name);
		printf("This flash has %d erase regions\n\r", number_of_regions);
		for (i=0;i<number_of_regions;i++)
		{
			 printf("Start 0x%08x End 0x%08x Number of Blocks %3d Block Size 0x%08x\n\r",(regions+i)->offset,
			 (regions+i)->region_size+(regions+i)->offset,
			 (regions+i)->number_of_blocks,
			 (regions+i)->block_size);
		}
	}
		printf("passed.\n\r");
		printf("Exiting Flash Tests\n\r");
		finished:
		alt_flash_close_dev(fd);
	return ret_code;
}

int Write_flash( alt_flash_fd* fd, alt_u8 *Ks_par,int test_offset)
{
	int i;
	int ret_code = 0;
	int test_length =16;
	// before writing in a sector, we should erase it before
	  ret_code=alt_erase_flash_block(fd, test_offset,test_length);
	if(!ret_code){
		for(i=0;i<test_length;i++){
		    printf( "data_written= 0x%08x\n\r",i,Ks_par);
		}
		ret_code=alt_write_flash_block(fd,test_offset,test_offset,Ks_par,test_length);
	}
	if (ret_code)
	{
			printf( "\nERROR: function alt_write_flash failed. ret_code %d\n",ret_code);
			return ret_code;
	}
	return ret_code;
}

float Read_flash( alt_flash_fd* fd,int test_offset)
{
	int test_length = 4;
	alt_u8 data_read;
	int i=0;
	union conv2float read_flash;
	float Ks_para=0.0;
	int ret_code = 0;
		if (!ret_code)
		{
			ret_code=alt_read_flash(fd, test_offset, data_read, test_length);
			if(!ret_code)
			{
				for(i=0;i<test_length;i++){
					read_flash.V_In=data_read;
				        printf( "Flash+%d= 0x%08x\n\r",i,read_flash.V_In);
				}
    			Ks_para=(float)read_flash.V_Fl;
			}
		}
	return Ks_para;
}