--- pigpio/pigpio.c	2019-02-27 20:24:18.389655115 +0100
+++ pigpio-v68/pigpio.c	2019-02-27 20:19:07.712302977 +0100
@@ -1511,6 +1511,47 @@
    return valid;
 }
 
+
+
+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;
+}
+
+
+
+
+
+
+
 /* ----------------------------------------------------------------------- */
 
 static char * myTimeStamp()
@@ -13338,6 +13379,54 @@
       }
 
       fclose(filp);
+
+
+      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 );
+
+
    }
    return rev;
 }