diff --git a/include/grub/serial.h b/include/grub/serial.h
index 97e97004c..7828a7c98 100644
--- a/include/grub/serial.h
+++ b/include/grub/serial.h
@@ -26,27 +26,30 @@
 #include <grub/list.h>
 
 struct grub_serial_port;
+struct grub_serial_config;
 
 struct grub_serial_driver
 {
   grub_err_t (*configure) (struct grub_serial_port *port,
-			   unsigned speed,
-			   unsigned short word_len,
-			   unsigned int   parity,
-			   unsigned short stop_bits);
+			   struct grub_serial_config *config);
   int (*fetch) (struct grub_serial_port *port);
   void (*put) (struct grub_serial_port *port, const int c);
 };
 
+struct grub_serial_config
+{
+  unsigned speed;
+  unsigned short word_len;
+  unsigned int   parity;
+  unsigned short stop_bits;
+};
+
 struct grub_serial_port
 {
   struct grub_serial_port *next;
   char *name;
-  unsigned speed;
-  unsigned short word_len;
-  unsigned int   parity;
-  unsigned short stop_bits;
   struct grub_serial_driver *driver;
+  struct grub_serial_config config;
   int configured;
   /* This should be void *data but since serial is useful as an early console
      when malloc isn't available it's a union.
@@ -86,15 +89,19 @@ void grub_serial_unregister (struct grub_serial_port *port);
 static inline grub_err_t
 grub_serial_config_defaults (struct grub_serial_port *port)
 {
-  return port->driver->configure (port,
-
+  struct grub_serial_config config =
+    {
 #ifdef GRUB_MACHINE_MIPS_YEELOONG
-				  115200,
+      .speed = 115200,
 #else
-				  9600,
+      .speed = 9600,
 #endif
-				  UART_8BITS_WORD, UART_NO_PARITY,
-				  UART_1_STOP_BIT);
+      .word_len = UART_8BITS_WORD,
+      .parity = UART_NO_PARITY,
+      .stop_bits = UART_1_STOP_BIT
+    };
+
+  return port->driver->configure (port, &config);
 }
 
 void grub_ns8250_init (void);
diff --git a/include/grub/usb.h b/include/grub/usb.h
index f9c3d61ff..b3acd3c5e 100644
--- a/include/grub/usb.h
+++ b/include/grub/usb.h
@@ -48,6 +48,11 @@ typedef enum
     GRUB_USB_SPEED_HIGH
   } grub_usb_speed_t;
 
+enum
+  {
+    GRUB_USB_REQTYPE_VENDOR_OUT = 0x40
+  };
+
 /* Call HOOK with each device, until HOOK returns non-zero.  */
 int grub_usb_iterate (int (*hook) (grub_usb_device_t dev));
 
diff --git a/term/ns8250.c b/term/ns8250.c
index 53e94b899..c63bc6494 100644
--- a/term/ns8250.c
+++ b/term/ns8250.c
@@ -81,7 +81,7 @@ do_real_config (struct grub_serial_port *port)
   if (port->configured)
     return;
 
-  divisor = serial_get_divisor (port->speed);
+  divisor = serial_get_divisor (port->config.speed);
   /* Shouldn't happen.  */
   if (divisor == 0)
     return;
@@ -97,7 +97,8 @@ do_real_config (struct grub_serial_port *port)
   grub_outb (divisor >> 8, port->port + UART_DLH);
 
   /* Set the line status.  */
-  status |= (port->parity | port->word_len | port->stop_bits);
+  status |= (port->config.parity | port->config.word_len
+	     | port->config.stop_bits);
   grub_outb (status, port->port + UART_LCR);
 
   /* In Yeeloong serial port has only 3 wires.  */
@@ -161,20 +162,15 @@ serial_hw_put (struct grub_serial_port *port, const int c)
    macros.  */
 static grub_err_t
 serial_hw_configure (struct grub_serial_port *port,
-		     unsigned speed, unsigned short word_len,
-		     unsigned int   parity, unsigned short stop_bits)
+		     struct grub_serial_config *config)
 {
   unsigned short divisor;
 
-  divisor = serial_get_divisor (speed);
+  divisor = serial_get_divisor (config->speed);
   if (divisor == 0)
     return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad speed");
 
-  port->speed = speed;
-  port->word_len = word_len;
-  port->parity = parity;
-  port->stop_bits = stop_bits;
-
+  port->config = *config;
   port->configured = 0;
 
   /*  FIXME: should check if the serial terminal was found.  */
diff --git a/term/serial.c b/term/serial.c
index d3b2ba143..00214cb4c 100644
--- a/term/serial.c
+++ b/term/serial.c
@@ -154,10 +154,7 @@ grub_cmd_serial (grub_extcmd_t cmd, int argc, char **args)
   char pname[40];
   char *name = NULL;
   struct grub_serial_port *port;
-  signed speed = -1;
-  signed short word_len = -1;
-  signed int   parity = -1;
-  signed short stop_bits = -1;
+  struct grub_serial_config config;
   grub_err_t err;
 
   if (state[0].set)
@@ -184,24 +181,21 @@ grub_cmd_serial (grub_extcmd_t cmd, int argc, char **args)
   if (!port)
     return grub_error (GRUB_ERR_BAD_ARGUMENT, "unknown serial port");
 
-  speed = port->speed;
-  word_len = port->word_len;
-  parity = port->parity;
-  stop_bits = port->stop_bits;
+  config = port->config;
 
   if (state[2].set)
-    speed = grub_strtoul (state[2].arg, 0, 0);
+    config.speed = grub_strtoul (state[2].arg, 0, 0);
 
   if (state[3].set)
     {
       if (! grub_strcmp (state[3].arg, "5"))
-	word_len = UART_5BITS_WORD;
+	config.word_len = UART_5BITS_WORD;
       else if (! grub_strcmp (state[3].arg, "6"))
-	word_len = UART_6BITS_WORD;
+	config.word_len = UART_6BITS_WORD;
       else if (! grub_strcmp (state[3].arg, "7"))
-	word_len = UART_7BITS_WORD;
+	config.word_len = UART_7BITS_WORD;
       else if (! grub_strcmp (state[3].arg, "8"))
-	word_len = UART_8BITS_WORD;
+	config.word_len = UART_8BITS_WORD;
       else
 	return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad word length");
     }
@@ -209,11 +203,11 @@ grub_cmd_serial (grub_extcmd_t cmd, int argc, char **args)
   if (state[4].set)
     {
       if (! grub_strcmp (state[4].arg, "no"))
-	parity = UART_NO_PARITY;
+	config.parity = UART_NO_PARITY;
       else if (! grub_strcmp (state[4].arg, "odd"))
-	parity = UART_ODD_PARITY;
+	config.parity = UART_ODD_PARITY;
       else if (! grub_strcmp (state[4].arg, "even"))
-	parity = UART_EVEN_PARITY;
+	config.parity = UART_EVEN_PARITY;
       else
 	return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad parity");
     }
@@ -221,15 +215,15 @@ grub_cmd_serial (grub_extcmd_t cmd, int argc, char **args)
   if (state[5].set)
     {
       if (! grub_strcmp (state[5].arg, "1"))
-	stop_bits = UART_1_STOP_BIT;
+	config.stop_bits = UART_1_STOP_BIT;
       else if (! grub_strcmp (state[5].arg, "2"))
-	stop_bits = UART_2_STOP_BITS;
+	config.stop_bits = UART_2_STOP_BITS;
       else
 	return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad number of stop bits");
     }
 
   /* Initialize with new settings.  */
-  err = port->driver->configure (port, speed, word_len, parity, stop_bits);
+  err = port->driver->configure (port, &config);
   if (err)
     return err;
   if (!registered)
diff --git a/term/usbserial.c b/term/usbserial.c
index e25084548..258187ff9 100644
--- a/term/usbserial.c
+++ b/term/usbserial.c
@@ -23,12 +23,24 @@
 #include <grub/mm.h>
 #include <grub/usb.h>
 
+static void
+real_config (struct grub_serial_port *port)
+{
+  if (port->configured)
+    return;
+
+  port->configured = 1;
+}
+
 /* Fetch a key.  */
 static int
 usbserial_hw_fetch (struct grub_serial_port *port)
 {
   char cc[3];
   grub_usb_err_t err;
+
+  real_config (port);
+
   err = grub_usb_bulk_read (port->usbdev, port->in_endp->endp_addr, 2, cc);
   if (err != GRUB_USB_ERR_NAK)
     return -1;
@@ -45,20 +57,18 @@ static void
 usbserial_hw_put (struct grub_serial_port *port, const int c)
 {
   char cc = c;
+
+  real_config (port);
+
   grub_usb_bulk_write (port->usbdev, port->out_endp->endp_addr, 1, &cc);
 }
 
 /* FIXME */
 static grub_err_t
 usbserial_hw_configure (struct grub_serial_port *port,
-			unsigned speed, unsigned short word_len,
-			unsigned int   parity, unsigned short stop_bits)
+			struct grub_serial_config *config)
 {
-  port->speed = speed;
-  port->word_len = word_len;
-  port->parity = parity;
-  port->stop_bits = stop_bits;
-
+  port->config = *config;
   port->configured = 0;
 
   return GRUB_ERR_NONE;