Added Pi4 Support

Raspberry.System/Board.cs

@@ -90,7 +90,17 @@ public Processor Processor
             get
             {
                 Processor processor;
-                return Enum.TryParse(ProcessorName, true, out processor) ? processor : Processor.Unknown;
+                if (Enum.TryParse(ProcessorName, true, out processor))
+                {
+                    // Check to see if we're dealing with a Pi 4 Model B
+                    // The Pi 4 Model B currently lies to us and tells us that it's a BCM2835
+                    if (processor == Processor.Bcm2835 && Model == Model.Pi4)
+                        processor = Processor.Bcm2711;
+
+                    return processor;
+                }
+
+                return  Processor.Unknown;
             }
         }
 
@@ -245,7 +255,8 @@ private Model LoadModel()
 
                 case 0x2082:
                     return Model.B3;
-
+                case 0x03111:
+                    return Model.Pi4;
                 default:
                     return Model.Unknown;
             }
@@ -268,6 +279,7 @@ private ConnectorPinout LoadConnectorPinout()
                 case Model.B2:
                 case Model.Zero:
                 case Model.B3:
+                case Model.Pi4:
                     return ConnectorPinout.Plus;
 
                 default:

Raspberry.System/Model.cs

@@ -56,7 +56,12 @@ public enum Model
         /// <summary>
         /// Pi 3 Model B.
         /// </summary>
-        B3
+        B3,
+
+        /// <summary>
+        /// Pi 4
+        /// </summary>
+        Pi4
     }
 
     /// <summary>
@@ -93,6 +98,8 @@ public static string GetDisplayName(this Model model)
                     return "Raspberry Pi Zero";
                 case Model.B3:
                     return "Raspberry Pi 3 Model B";
+                case Model.Pi4:
+                    return "Raspberry Pi 4 Model B";
 
                 default:
                     throw new ArgumentOutOfRangeException("model");

Raspberry.System/Processor.cs

@@ -18,6 +18,16 @@ public enum Processor
         /// <summary>
         /// Processor is a BCM2709.
         /// </summary>
-        Bcm2709
+        Bcm2709,
+
+        /// <summary>
+        /// Processor is BCM2711
+        /// </summary>
+        Bcm2711,
+
+        /// <summary>
+        /// Processor is BCM2835
+        /// </summary>
+        Bcm2835
     }
 }