Fix the port default for the RaspberryPi.

p1load.c

@@ -16,7 +16,11 @@
 #if defined(CYGWIN) || defined(WIN32) || defined(MINGW)
   #define PORT_PREFIX ""
 #elif defined(LINUX)
-  #define PORT_PREFIX "ttyUSB"
+  #ifdef RASPBERRY_PI
+    #define PORT_PREFIX "ttyAMA"
+  #else
+    #define PORT_PREFIX "ttyUSB"
+  #endif
 #elif defined(MACOSX)
   #define PORT_PREFIX "cu.usbserial"
 #else
@@ -68,11 +72,7 @@ int main(int argc, char *argv[])
     /* initialize */
     baudRate = baudRate2 = BAUD_RATE;
     verbose = terminalMode = pstMode = FALSE;
-#ifdef RASPBERRY_PI
-    port = "/dev/ttyAMA0";
-#else
     port = NULL;
-#endif
     
     /* initialize the loader */
     PL_Init(&state, &serial, NULL);