diff --git a/target/linux/ixp4xx/patches-3.3/160-delayed_uart_io.patch b/target/linux/ixp4xx/patches-3.3/160-delayed_uart_io.patch
new file mode 100644
index 000000000..a3b1f25e5
--- /dev/null
+++ b/target/linux/ixp4xx/patches-3.3/160-delayed_uart_io.patch
@@ -0,0 +1,122 @@
+Add a new UART I/O type for slow busses such as the ixp4xx expansion bus
+--- a/include/linux/serial_8250.h
++++ b/include/linux/serial_8250.h
+@@ -27,6 +27,7 @@ struct plat_serial8250_port {
+ 	void            *private_data;
+ 	unsigned char	regshift;	/* register shift */
+ 	unsigned char	iotype;		/* UPIO_* */
++	unsigned int rw_delay;	/* udelay for slower busses IXP4XX Expansion Bus */
+ 	unsigned char	hub6;
+ 	upf_t		flags;		/* UPF_* flags */
+ 	unsigned int	type;		/* If UPF_FIXED_TYPE */
+--- a/include/linux/serial_core.h
++++ b/include/linux/serial_core.h
+@@ -324,6 +324,7 @@ struct uart_port {
+ #define UPIO_AU			(4)			/* Au1x00 type IO */
+ #define UPIO_TSI		(5)			/* Tsi108/109 type IO */
+ #define UPIO_RM9000		(6)			/* RM9000 type IO */
++#define UPIO_MEM_DELAY		(7)
+ 
+ 	unsigned int		read_status_mask;	/* driver specific */
+ 	unsigned int		ignore_status_mask;	/* driver specific */
+@@ -368,6 +369,7 @@ struct uart_port {
+ 
+ 	unsigned int		mctrl;			/* current modem ctrl settings */
+ 	unsigned int		timeout;		/* character-based timeout */
++	unsigned int		rw_delay;		/* udelay for slow busses, IXP4XX Expansion Bus */
+ 	unsigned int		type;			/* port type */
+ 	const struct uart_ops	*ops;
+ 	unsigned int		custom_divisor;
+--- a/drivers/tty/serial/8250/8250.c
++++ b/drivers/tty/serial/8250/8250.c
+@@ -400,6 +400,20 @@ static void mem_serial_out(struct uart_p
+ 	writeb(value, p->membase + offset);
+ }
+ 
++static unsigned int memdelay_serial_in(struct uart_port *p, int offset)
++{
++	struct uart_8250_port *up = (struct uart_8250_port *)p;
++	udelay(up->port.rw_delay);
++	return mem_serial_in(p, offset);
++}
++
++static void memdelay_serial_out(struct uart_port *p, int offset, int value)
++{
++	struct uart_8250_port *up = (struct uart_8250_port *)p;
++	udelay(up->port.rw_delay);
++	mem_serial_out(p, offset, value);
++}
++
+ static void mem32_serial_out(struct uart_port *p, int offset, int value)
+ {
+ 	offset = map_8250_out_reg(p, offset) << p->regshift;
+@@ -459,6 +473,11 @@ static void set_io_from_upio(struct uart
+ 		p->serial_out = mem32_serial_out;
+ 		break;
+ 
++	case UPIO_MEM_DELAY:
++		p->serial_in = memdelay_serial_in;
++		p->serial_out = memdelay_serial_out;
++		break;
++
+ 	case UPIO_AU:
+ 		p->serial_in = au_serial_in;
+ 		p->serial_out = au_serial_out;
+@@ -481,6 +500,7 @@ serial_out_sync(struct uart_8250_port *u
+ 	switch (p->iotype) {
+ 	case UPIO_MEM:
+ 	case UPIO_MEM32:
++	case UPIO_MEM_DELAY:
+ 	case UPIO_AU:
+ 		p->serial_out(p, offset, value);
+ 		p->serial_in(p, UART_LCR);	/* safe, no side-effects */
+@@ -2498,6 +2518,7 @@ static int serial8250_request_std_resour
+ 	case UPIO_TSI:
+ 	case UPIO_MEM32:
+ 	case UPIO_MEM:
++	case UPIO_MEM_DELAY:
+ 		if (!up->port.mapbase)
+ 			break;
+ 
+@@ -2534,6 +2555,7 @@ static void serial8250_release_std_resou
+ 	case UPIO_TSI:
+ 	case UPIO_MEM32:
+ 	case UPIO_MEM:
++	case UPIO_MEM_DELAY:
+ 		if (!up->port.mapbase)
+ 			break;
+ 
+@@ -3050,6 +3072,7 @@ static int __devinit serial8250_probe(st
+ 		port.set_termios	= p->set_termios;
+ 		port.pm			= p->pm;
+ 		port.dev		= &dev->dev;
++		port.rw_delay		= p->rw_delay;
+ 		port.irqflags		|= irqflag;
+ 		ret = serial8250_register_port(&port);
+ 		if (ret < 0) {
+@@ -3199,6 +3222,7 @@ int serial8250_register_port(struct uart
+ 		uart->port.iotype       = port->iotype;
+ 		uart->port.flags        = port->flags | UPF_BOOT_AUTOCONF;
+ 		uart->port.mapbase      = port->mapbase;
++		uart->port.rw_delay			= port->rw_delay;
+ 		uart->port.private_data = port->private_data;
+ 		if (port->dev)
+ 			uart->port.dev = port->dev;
+--- a/drivers/tty/serial/serial_core.c
++++ b/drivers/tty/serial/serial_core.c
+@@ -2021,6 +2021,7 @@ uart_report_port(struct uart_driver *drv
+ 		snprintf(address, sizeof(address),
+ 			 "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
+ 		break;
++	case UPIO_MEM_DELAY:
+ 	case UPIO_MEM:
+ 	case UPIO_MEM32:
+ 	case UPIO_AU:
+@@ -2435,6 +2436,7 @@ int uart_match_port(struct uart_port *po
+ 	case UPIO_HUB6:
+ 		return (port1->iobase == port2->iobase) &&
+ 		       (port1->hub6   == port2->hub6);
++	case UPIO_MEM_DELAY:
+ 	case UPIO_MEM:
+ 	case UPIO_MEM32:
+ 	case UPIO_AU:
diff --git a/target/linux/ixp4xx/patches-3.3/191-cambria_optional_uart.patch b/target/linux/ixp4xx/patches-3.3/191-cambria_optional_uart.patch
index 636ebd715..130606fb5 100644
--- a/target/linux/ixp4xx/patches-3.3/191-cambria_optional_uart.patch
+++ b/target/linux/ixp4xx/patches-3.3/191-cambria_optional_uart.patch
@@ -94,124 +94,3 @@
  	platform_device_register(&cambria_npec_device);
  	platform_device_register(&cambria_npea_device);
  
---- a/include/linux/serial_8250.h
-+++ b/include/linux/serial_8250.h
-@@ -27,6 +27,7 @@ struct plat_serial8250_port {
- 	void            *private_data;
- 	unsigned char	regshift;	/* register shift */
- 	unsigned char	iotype;		/* UPIO_* */
-+	unsigned int rw_delay;	/* udelay for slower busses IXP4XX Expansion Bus */
- 	unsigned char	hub6;
- 	upf_t		flags;		/* UPF_* flags */
- 	unsigned int	type;		/* If UPF_FIXED_TYPE */
---- a/include/linux/serial_core.h
-+++ b/include/linux/serial_core.h
-@@ -324,6 +324,7 @@ struct uart_port {
- #define UPIO_AU			(4)			/* Au1x00 type IO */
- #define UPIO_TSI		(5)			/* Tsi108/109 type IO */
- #define UPIO_RM9000		(6)			/* RM9000 type IO */
-+#define UPIO_MEM_DELAY		(7)
- 
- 	unsigned int		read_status_mask;	/* driver specific */
- 	unsigned int		ignore_status_mask;	/* driver specific */
-@@ -368,6 +369,7 @@ struct uart_port {
- 
- 	unsigned int		mctrl;			/* current modem ctrl settings */
- 	unsigned int		timeout;		/* character-based timeout */
-+	unsigned int		rw_delay;		/* udelay for slow busses, IXP4XX Expansion Bus */
- 	unsigned int		type;			/* port type */
- 	const struct uart_ops	*ops;
- 	unsigned int		custom_divisor;
---- a/drivers/tty/serial/8250/8250.c
-+++ b/drivers/tty/serial/8250/8250.c
-@@ -400,6 +400,20 @@ static void mem_serial_out(struct uart_p
- 	writeb(value, p->membase + offset);
- }
- 
-+static unsigned int memdelay_serial_in(struct uart_port *p, int offset)
-+{
-+	struct uart_8250_port *up = (struct uart_8250_port *)p;
-+	udelay(up->port.rw_delay);
-+	return mem_serial_in(p, offset);
-+}
-+
-+static void memdelay_serial_out(struct uart_port *p, int offset, int value)
-+{
-+	struct uart_8250_port *up = (struct uart_8250_port *)p;
-+	udelay(up->port.rw_delay);
-+	mem_serial_out(p, offset, value);
-+}
-+
- static void mem32_serial_out(struct uart_port *p, int offset, int value)
- {
- 	offset = map_8250_out_reg(p, offset) << p->regshift;
-@@ -459,6 +473,11 @@ static void set_io_from_upio(struct uart
- 		p->serial_out = mem32_serial_out;
- 		break;
- 
-+	case UPIO_MEM_DELAY:
-+		p->serial_in = memdelay_serial_in;
-+		p->serial_out = memdelay_serial_out;
-+		break;
-+
- 	case UPIO_AU:
- 		p->serial_in = au_serial_in;
- 		p->serial_out = au_serial_out;
-@@ -481,6 +500,7 @@ serial_out_sync(struct uart_8250_port *u
- 	switch (p->iotype) {
- 	case UPIO_MEM:
- 	case UPIO_MEM32:
-+	case UPIO_MEM_DELAY:
- 	case UPIO_AU:
- 		p->serial_out(p, offset, value);
- 		p->serial_in(p, UART_LCR);	/* safe, no side-effects */
-@@ -2498,6 +2518,7 @@ static int serial8250_request_std_resour
- 	case UPIO_TSI:
- 	case UPIO_MEM32:
- 	case UPIO_MEM:
-+	case UPIO_MEM_DELAY:
- 		if (!up->port.mapbase)
- 			break;
- 
-@@ -2534,6 +2555,7 @@ static void serial8250_release_std_resou
- 	case UPIO_TSI:
- 	case UPIO_MEM32:
- 	case UPIO_MEM:
-+	case UPIO_MEM_DELAY:
- 		if (!up->port.mapbase)
- 			break;
- 
-@@ -3050,6 +3072,7 @@ static int __devinit serial8250_probe(st
- 		port.set_termios	= p->set_termios;
- 		port.pm			= p->pm;
- 		port.dev		= &dev->dev;
-+		port.rw_delay		= p->rw_delay;
- 		port.irqflags		|= irqflag;
- 		ret = serial8250_register_port(&port);
- 		if (ret < 0) {
-@@ -3199,6 +3222,7 @@ int serial8250_register_port(struct uart
- 		uart->port.iotype       = port->iotype;
- 		uart->port.flags        = port->flags | UPF_BOOT_AUTOCONF;
- 		uart->port.mapbase      = port->mapbase;
-+		uart->port.rw_delay			= port->rw_delay;
- 		uart->port.private_data = port->private_data;
- 		if (port->dev)
- 			uart->port.dev = port->dev;
---- a/drivers/tty/serial/serial_core.c
-+++ b/drivers/tty/serial/serial_core.c
-@@ -2021,6 +2021,7 @@ uart_report_port(struct uart_driver *drv
- 		snprintf(address, sizeof(address),
- 			 "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
- 		break;
-+	case UPIO_MEM_DELAY:
- 	case UPIO_MEM:
- 	case UPIO_MEM32:
- 	case UPIO_AU:
-@@ -2435,6 +2436,7 @@ int uart_match_port(struct uart_port *po
- 	case UPIO_HUB6:
- 		return (port1->iobase == port2->iobase) &&
- 		       (port1->hub6   == port2->hub6);
-+	case UPIO_MEM_DELAY:
- 	case UPIO_MEM:
- 	case UPIO_MEM32:
- 	case UPIO_AU: