--- linuxppc_2_4_ORI/arch/ppc/5xxx_io/psc.c	2007-11-26 13:31:39.000000000 +0100
+++ linuxppc_2_4_devel/arch/ppc/5xxx_io/psc.c	2007-11-23 16:13:25.000000000 +0100
@@ -662,12 +662,22 @@ static void rs_hungup(void *ptr)
 	func_exit();
 }
 
+#ifdef CONFIG_BC3450
+static int get_tx_fifo_status(struct rs_port *port, unsigned int *value)
+{
+	struct mpc5xxx_psc *psc = port->psc;
+	unsigned int result;
+
+	/* reads and returns Tx-FIFO-Status register */
+	result = in_be16(&psc->tfstat);
+	return put_user(result,value);
+}
+#endif
+
 static int get_modem_info(struct rs_port *port, unsigned int *value)
 {
-	struct tty_struct *tty = port->gs.tty;
 	struct mpc5xxx_psc *psc = port->psc;
 	unsigned int result;
-	unsigned long flags;
 
 	result = ((in_8(&psc->ip) & MPC5xxx_PSC_CTS) ? 0 : TIOCM_CTS) |
 		 ((in_8(&psc->ip) & MPC5xxx_PSC_DCD) ? 0 : TIOCM_CAR);
@@ -682,13 +692,11 @@ static int get_modem_info(struct rs_port
 static int set_modem_info(struct rs_port *port, unsigned int cmd,
 			  unsigned int *value)
 {
-	struct tty_struct *tty = port->gs.tty;
 	struct mpc5xxx_psc *psc = port->psc;
 	int error = 0;
 	unsigned int arg;
-	unsigned long flags;
 
-	if (copy_from_user(&arg, value, sizeof(int)))
+	if (get_user(arg,value))
 		return -EFAULT;
  
 	// We only support setting/reseting the RTS bit, nothing else.
@@ -754,6 +762,10 @@ static int rs_ioctl(struct tty_struct * 
 	case TIOCMBIS:
 		rc = set_modem_info(port, cmd, (unsigned int *) arg);
 		break;
+#ifdef CONFIG_BC3450
+	case TIOCGTXFIFOST:
+		return get_tx_fifo_status(port, (unsigned int *) arg);
+#endif
 	default:
 		rc = -ENOIOCTLCMD;
 		break;
--- linuxppc_2_4_ORI/include/asm-ppc/ioctls.h	2007-11-26 13:31:54.000000000 +0100
+++ linuxppc_2_4_devel/include/asm-ppc/ioctls.h	2007-11-22 13:23:14.000000000 +0100
@@ -105,4 +105,6 @@
 #define TIOCMIWAIT	0x545C	/* wait for a change on serial input line(s) */
 #define TIOCGICOUNT	0x545D	/* read serial port inline interrupt counts */
 
+#define TIOCGTXFIFOST	0x5460	/* Get TX FIFO STatus */
+
 #endif /* _ASM_PPC_IOCTLS_H */