static unsigned get_dt_ranges(const char *filename, unsigned offset)

{

   unsigned address = ~0;

   FILE *fp = fopen(filename, "rb");

   if (fp)

   {

      unsigned char buf[4];

      fseek(fp, offset, SEEK_SET);

      if (fread(buf, 1, sizeof buf, fp) == sizeof buf)

         address = buf[0] << 24 | buf[1] << 16 | buf[2] << 8 | buf[3] << 0;

      fclose(fp);

   }

   return address;

}

unsigned bcm_host_get_peripheral_address(void)

{

   unsigned address = get_dt_ranges("/proc/device-tree/soc/ranges", 4);

   return address == ~0 ? 0x20000000 : address;

}

unsigned bcm_host_get_peripheral_size(void)

{

   unsigned address = get_dt_ranges("/proc/device-tree/soc/ranges", 8);

   return address == ~0 ? 0x01000000 : address;

}

unsigned bcm_host_get_sdram_address(void)

{

    unsigned address = get_dt_ranges("/proc/device-tree/axi/vc_mem/reg", 8);

    return address == ~0 ? 0x40000000 : address;

}

      if ( piCores == 0)

          {

	  if ( !strncasecmp("processor\t: 0", buf, 10) )

	  	{

	  	piCores=1;

                piCores = 1;

                pi_peri_phys = 0x20000000;

                pi_dram_bus  = 0x40000000;

                pi_mem_flag  = 0x0C;

                }

	  else if ( strncasecmp( "processor\t: 3", buf, 10) )

	  	{

	  	piCores=4;

		pi_peri_phys = bcm_host_get_peripheral_address();

		pi_dram_bus  = bcm_host_get_sdram_address();

		pi_mem_flag  = 0x04;

		}

	  }

printf("peripheral address %x\n", pi_peri_phys);

printf("sdram_address %x\n", pi_dram_bus);

      printf("piCores: %d\n", piCores);

      if ( rev == 0 )

      	  {

	  filp =  fopen( "/proc/device-tree/system/linux,revision", "r" );

	  if (filp != NULL)

      		{  

            	while (fgets(buf, sizeof(buf), filp) != NULL)

	            {  

		    rev = (unsigned)buf[0];

		    rev <<= 8;

		    rev |= (unsigned)buf[1];

		    rev <<= 8;

                    rev |= (unsigned)buf[2];

		    rev <<= 8;

		    rev |= (unsigned)buf[3];

		    }

		}

	  fclose( filp );

	  }

      printf("revision: %8x\n", rev );