FPGA memory initialization and management

I really don't understand what's happening in my design. I give you details:

The hardware part (a Quartus II project downloaded on the Cyclone IV of a de0-nano board) is instantiating a qsys project with a Nios II cpu and a dual-port memory. The cpu can read the memory that can be written by the hardware part. For the moment I don't write anything, the memory (8-bit words) is initialized by a .hex file created as a memory initialization file by Quartus II as showed by this picture:

https://www.alteraforum.com/forum/attachment.php?attachmentid=9298

A software is running on the cpu. I give the code:

#include <stdio.h>
# include "system.h"
int main()
{
  int *pmem;
  int i=0;
 
  printf("Start!\n");
  for (i=0; i<15; i++)
  {
	  pmem=(int *)(0x80000000|(ONCHIP_MEMORY2_0_BASE+i));
	  printf("%u\n", *pmem);
  }
  return 0;
}

and the result is:

--- Quote Start ---

Start!

67305985

67305985

67305985

67305985

134678021

134678021

134678021

134678021

2826

2826

2826

2826

0

0

0

--- Quote End ---

I don't understand this. If you can explain what is done, please tell me.

Thanks.