i386/pc: Initialise the printk serial port on first use

bsps/i386/pc386/console/conscfg.c

@@ -46,15 +46,14 @@
 
   #define CLOCK_RATE    (115200 * 16)
 
-  static uint8_t com_get_register(uint32_t addr, uint8_t i)
+  static uint8_t com_get_register(uintptr_t addr, uint8_t i)
   {
-    register uint8_t val;
-
+    uint8_t val;
     inport_byte( (addr + i), val );
     return val;
   }
 
-  static void com_set_register(uint32_t addr, uint8_t i, uint8_t val)
+  static void com_set_register(uintptr_t addr, uint8_t i, uint8_t val)
   {
     outport_byte( (addr + i), val );
   }

bsps/i386/pc386/console/printk_support.c

@@ -29,6 +29,28 @@
 
 rtems_device_minor_number BSPPrintkPort = 0;
 
+static bool serialInit;
+static bool serialOK;
+
+static bool serialValid(console_tbl *port)
+{
+  if (port->pDeviceFns) {
+    if (!serialInit) {
+      serialOK = true;
+      if (port->pDeviceFns->deviceProbe != NULL) {
+        if (!port->pDeviceFns->deviceProbe( BSPPrintkPort ))
+          serialOK = false;
+        else if (port->pDeviceFns->deviceInitialize != NULL)
+          port->pDeviceFns->deviceInitialize( BSPPrintkPort );
+        else
+          serialOK = false;
+      }
+      serialInit = true;
+    }
+  }
+  return serialOK;
+}
+
 void BSP_outch(char ch);
 int BSP_inch(void);
 
@@ -42,11 +64,13 @@ void BSP_outch(char ch)
 
   if ( !isVga ) {
     console_tbl *port = Console_Port_Tbl[BSPPrintkPort];
-    if (port->pDeviceFns && port->pDeviceFns->deviceWritePolled) {
+    if (serialValid(port)) {
+      if (port->pDeviceFns->deviceWritePolled) {
         port->pDeviceFns->deviceWritePolled( BSPPrintkPort, ch );
       }
       return;
     }
+  }
 
   #if BSP_ENABLE_VGA
     _IBMPC_outch( ch );
@@ -65,13 +89,15 @@ int BSP_inch(void)
 
   if ( !isVga ) {
     console_tbl *port = Console_Port_Tbl[BSPPrintkPort];
-    if (port->pDeviceFns && port->pDeviceFns->deviceRead) {
+    if (serialValid(port)) {
+      if (port->pDeviceFns->deviceRead) {
         do {
           result = port->pDeviceFns->deviceRead( BSPPrintkPort );
         } while (result == -1);
         return result;
       }
     }
+  }
 
   #if BSP_ENABLE_VGA
     result = BSP_wait_polled_input();