boot NIOS and FPGA from EPCS flash

Could you post the exact code you are using for your test? Including all inputs and outputs?

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;
}

Having a quick look at your code I don't see anything wrong. Now let's look for less obvious bugs.

Oh and I forgot... The %x in printf is expecting an int (4 bytes) argument, but you are giving it a byte. It's not a problem if it's the last argument in the printf call, but if you decide to add more debugging information later it will probably get confusing. I suggest casting your arguments to (int) in the printf call.

Hi Daixiwen,

May be it's a configuration problem.

	printf("passed.\n\r");
		printf("Exiting Flash Tests\n\r");
		finished:
		alt_flash_close_dev(fd);
	return ret_code;
}

Ok Daixiwen, thank you.

1)It's a development board(DE0-Nano Development and Education Board).