Cyclone III Starter Kit - DDR-SDRAM - help

My really question is:

I want to write and to read in ddr-sdram.

I have four options:

*Implement all logic by "hand" (in code VHDL);

*Use the SOPC Builder for start the project from 'zero';

*Change the QB3 Control Painel example;

*Change the CycloneIII_3c25_start_niosII_standard example.

Changing the QB3 Control Painel example, I don't have the SOPC Builder System PTF file for implement my code in Nios II. And I don't get to create this file.

Changing the CycloneIII_3c25_start_niosII_standard example, my project have only: Nios II processor,DDR-SDRAM controller,jtag,onchip memory and led pio.

I compile the project, and in the Nios software, I program this code:

int main(void)

{

int ch;

int a,b,c,d;

int memory_base = 0x02000000;

/* Print the Header */

MenuHeader();

/* Print the menu and do what the user requests, until they hit 'q' */

while (1)

{

IOWR_8DIRECT(memory_base, 0, 0x0A);

IOWR_8DIRECT(memory_base, 1, 0x05);

IOWR_8DIRECT(memory_base, 2, 0xA0);

IOWR_8DIRECT(memory_base, 3, 0x50);

a = IORD_8DIRECT(memory_base, 0);

b = IORD_8DIRECT(memory_base, 1);

c = IORD_8DIRECT(memory_base, 2);

d = IORD_8DIRECT(memory_base, 3);

printf( "\nmemory 1 = %d.\n",a);

printf( "\nmemory 2 = %d.\n",b);

printf( "\nmemory 3 = %d.\n",c);

printf( "\nmemory 4 = %d.\n",d);

//ch = TopMenu();

if (ch == 'q')

{

printf( "\nExiting from Memory Test.\n");

break;

}

}

return (0);

}

But, when I run this, appears a error:

Verifying 02000000 ( 0%)

Verifying 02010000 (83%)

Verifying 04001020 (99%)

Verify failed between address 0x4001020 and 0x40011C7

Leaving target processor paused

Someone help me ?

Before tihe, I tried to test the memory test template of Nios II and I don't have success too.