Fix a problem where an error is reported when only -P is specified.

p1load.c

@@ -45,6 +45,7 @@ int main(int argc, char *argv[])
     int baudRate, baudRate2, verbose, terminalMode, pstMode, i;
     int loadType = LOAD_TYPE_RUN;
     int loadTypeOptionSeen = FALSE;
+    int actionSpecified = FALSE;
     char *file = NULL;
     long imageSize;
     uint8_t *image;
@@ -135,6 +136,7 @@ int main(int argc, char *argv[])
                 break;
             case 'P':
                 ShowPorts(&state, PORT_PREFIX);
+                actionSpecified = TRUE;
                 break;
             case 'r':
                 if (!loadTypeOptionSeen) {
@@ -148,6 +150,7 @@ int main(int argc, char *argv[])
                 // fall through
             case 't':
                 terminalMode = TRUE;
+                actionSpecified = TRUE;
                 break;
             case 'v':
                 verbose = TRUE;
@@ -165,16 +168,18 @@ int main(int argc, char *argv[])
             if (file)
                 Usage();
             file = argv[i];
+            actionSpecified = TRUE;
         }
     }
     
     /* complain about nothing to do */
-    if (!file && !terminalMode) {
+    if (!actionSpecified) {
         printf("error: must specify either a file to load or -t\n");
         return 1;
     }
         
     /* open the serial port */
+    if (file || terminalMode) {
         switch (InitPort(&state, PORT_PREFIX, port, baudRate, verbose, actualPort)) {
         case CHECK_PORT_OK:
             printf("Found propeller version %d on %s\n", state.version, actualPort);
@@ -190,6 +195,7 @@ int main(int argc, char *argv[])
                 printf("error: can't find a port with a propeller chip\n");
             return 1;
         }
+    }
     
     /* check for a file to load */
     if (file) {