DMA - memory to memory writing problem..

We solved the problem. After checking the system in Quartus, we saw, that the SD-RAM we used wasn't directly connected with the CPU1. We use an Cyclon3 with 2 CPU and it seems, that this was the Problem. After adding an On-Chip-Memmory and using this, or changing the accessed memmory to S-RAM it worked. For anybody who try to work with DMA and also has some problems dealing with the code, here is our working example without HAL.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "sys/alt_dma.h"
#include "system.h"
#include "altera_avalon_dma_regs.h"
#include "alt_types.h"
#include "sys/alt_irq.h"
 
static int dma_done=0,TX,RX;
 
static void doneDMA(void* context , alt_u32 id)
{
 usleep(10);
 dma_done++;
 IOWR_ALTERA_AVALON_DMA_STATUS(DMA_RS485_BASE, 0); 
}
 
int Init(void)
{
 IOWR_ALTERA_AVALON_DMA_CONTROL(DMA_RS485_BASE,
 ALTERA_AVALON_DMA_CONTROL_BYTE_MSK| 
 ALTERA_AVALON_DMA_CONTROL_LEEN_MSK|
 ALTERA_AVALON_DMA_CONTROL_I_EN_MSK);
 alt_irq_register(DMA_RS485_IRQ,(void*) NULL,doneDMA);
 return 0;
}
 
void Transfer(int where,int from,int howmuch)
{
 dma_done=0;
 while ((IORD_ALTERA_AVALON_DMA_STATUS(DMA_RS485_BASE) &
  ALTERA_AVALON_DMA_STATUS_BUSY_MSK));
 IOWR_ALTERA_AVALON_DMA_STATUS(DMA_RS485_BASE, 0);
 IOWR_ALTERA_AVALON_DMA_LENGTH(DMA_RS485_BASE, howmuch);
 IOWR_ALTERA_AVALON_DMA_RADDRESS(DMA_RS485_BASE,(int) from);
 IOWR_ALTERA_AVALON_DMA_WADDRESS(DMA_RS485_BASE,(int) where);
 IOWR_ALTERA_AVALON_DMA_CONTROL(DMA_RS485_BASE,
  ALTERA_AVALON_DMA_CONTROL_GO_MSK |
  IORD_ALTERA_AVALON_DMA_CONTROL(DMA_RS485_BASE)); 
}
 
void MemInit(int base_addr,int len, int value)
{
 int i;
 for (i=0;i<len;i++)
  IOWR_8DIRECT(base_addr,i,value);
}
 
int main(void)
{
 MemInit((int)RX,0x10,3);
 MemInit((int)TX,0x10,6);
 Init();
 Transfer((int)RX,(int)TX,16);
 while(!dma_done);
 return 0; 
}