--- zzzz-none-000/linux-2.6.13.1/drivers/serial/serial_core.c	2005-09-10 02:42:58.000000000 +0000
+++ ohio-7170-487/linux-2.6.13.1/drivers/serial/serial_core.c	2006-11-06 16:02:03.000000000 +0000
@@ -1843,7 +1843,6 @@
 
 	if (flow == 'r')
 		termios.c_cflag |= CRTSCTS;
-
 	port->ops->set_termios(port, &termios, NULL);
 	co->cflag = termios.c_cflag;
 
@@ -2186,11 +2185,14 @@
 {
 	struct uart_state *state;
 	int ret = 0;
+    printk("[uart_add_one_port]\n");
 
 	BUG_ON(in_interrupt());
 
-	if (port->line >= drv->nr)
+	if (port->line >= drv->nr) {
+        printk("[uart_add_one_port] (port->line >= drv->nr)\n");
 		return -EINVAL;
+    }
 
 	state = drv->state + port->line;
 
@@ -2225,13 +2227,19 @@
 	 * successfully registered yet, try to re-register it.
 	 * It may be that the port was not available.
 	 */
-	if (port->type != PORT_UNKNOWN &&
-	    port->cons && !(port->cons->flags & CON_ENABLED))
+	if (port->type != PORT_UNKNOWN && port->cons && !(port->cons->flags & CON_ENABLED)) {
+        printk("[uart_add_one_port] now register console\n");
 		register_console(port->cons);
+    } else {
+        printk("[uart_add_one_port] dont register console port->type = %u\n", port->type);
+        printk("port->cons = 0x%x port->cons->flags = 0x%x\n",
+            port->cons, port->cons ?  port->cons->flags : 0);
+    }
 
  out:
 	up(&port_sem);
 
+    printk("[uart_add_one_port] success\n");
 	return ret;
 }