Urgent: sdram to flash

[Altera_Forum]

How to write 1Mb of data, let's say all '0' from sdram to flash? I know how to transfer like 100 digits but I am stuck when I tried to transfer 1Mb of data. When I try to transfer 1Mb of data, it seems like stuck during writing into flash. I am using de2 board with 8mb sdram and 4mb flash. 

   --- Quote Start ---  # include <stdio.h># include <stdlib.h># include "system.h"# include "alt_types.h"# include "sys/alt_dma.h"# include "sys/alt_flash.h" # include "sys/alt_flash_dev.h" # define size 1048576   int main () {  int rc;     alt_flash_fd* fd;  int ret_code, i;  int source;  int dest;     //printf("Source\tDest:\n");  for(i=0;i<size;i++)  {  source = i;  dest = 0;    }  printf("%d\t%d\n", source, dest);   printf("Final\n\n");  fd = alt_flash_open_dev(EXT_FLASH_NAME);  if (fd!=NULL)  {  if((ret_code = alt_write_flash(fd, 0, source, 1048576)) == 0)  {    if((ret_code = alt_read_flash(fd, 0, dest, 1048576)) == 0)  {    printf("%d\t%d\n", source, dest);     }else  {  printf("Error in reading from flash\n");  }   }else  {  printf("Error in writing to flash\n");  }   }else  {  printf("Error in opening flash\n");  exit(1);  }  return 0; }   --- Quote End ---    It stucks here:    --- Quote Start ---   nios2-terminal: connected to hardware target using JTAG UART on cable nios2-terminal: "USB-Blaster [USB-0]", device 1, instance 0 nios2-terminal: (Use the IDE stop button or Ctrl-C to terminate)   --- Quote End ---