diff --git a/post/cpu/ppc4xx/uart.c b/post/cpu/ppc4xx/uart.c
new file mode 100644
index 0000000..f220dba
--- /dev/null
+++ b/post/cpu/ppc4xx/uart.c
@@ -0,0 +1,214 @@
+/*
+ * (C) Copyright 2007
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+
+/*
+ * UART test
+ *
+ * The controllers are configured to loopback mode and several
+ * characters are transmitted.
+ */
+
+#ifdef CONFIG_POST
+
+#include <post.h>
+
+#if CONFIG_POST & CFG_POST_UART
+
+#include <asm/processor.h>
+#include <serial.h>
+
+#define UART0_BASE  CFG_PERIPHERAL_BASE + 0x00000300
+#define UART1_BASE  CFG_PERIPHERAL_BASE + 0x00000400
+#define UART2_BASE  CFG_PERIPHERAL_BASE + 0x00000500
+#define UART3_BASE  CFG_PERIPHERAL_BASE + 0x00000600
+
+#define CR0_MASK        0xdfffffff
+#define CR0_EXTCLK_ENA  0x00800000
+#define CR0_UDIV_POS    0
+#define UDIV_SUBTRACT	0
+#define UART0_SDR	sdr_uart0
+#define UART1_SDR	sdr_uart1
+#define UART2_SDR	sdr_uart2
+#define UART3_SDR	sdr_uart3
+#define MFREG(a, d)	mfsdr(a, d)
+#define MTREG(a, d)	mtsdr(a, d)
+
+#define UART_RBR    0x00
+#define UART_THR    0x00
+#define UART_IER    0x01
+#define UART_IIR    0x02
+#define UART_FCR    0x02
+#define UART_LCR    0x03
+#define UART_MCR    0x04
+#define UART_LSR    0x05
+#define UART_MSR    0x06
+#define UART_SCR    0x07
+#define UART_DLL    0x00
+#define UART_DLM    0x01
+
+/*
+  Line Status Register.
+*/
+#define asyncLSRDataReady1            0x01
+#define asyncLSROverrunError1         0x02
+#define asyncLSRParityError1          0x04
+#define asyncLSRFramingError1         0x08
+#define asyncLSRBreakInterrupt1       0x10
+#define asyncLSRTxHoldEmpty1          0x20
+#define asyncLSRTxShiftEmpty1         0x40
+#define asyncLSRRxFifoError1          0x80
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int uart_post_init (unsigned long dev_base)
+{
+	unsigned long reg;
+	unsigned long udiv;
+	unsigned short bdiv;
+	volatile char val;
+#ifdef CFG_EXT_SERIAL_CLOCK
+	unsigned long tmp;
+#endif
+	int i;
+
+	for (i = 0; i < 3500; i++) {
+		if (in8 (dev_base + UART_LSR) & asyncLSRTxHoldEmpty1)
+			break;
+		udelay (100);
+	}
+	MFREG(UART0_SDR, reg);
+	reg &= ~CR0_MASK;
+
+#ifdef CFG_EXT_SERIAL_CLOCK
+	reg |= CR0_EXTCLK_ENA;
+	udiv = 1;
+	tmp  = gd->baudrate * 16;
+	bdiv = (CFG_EXT_SERIAL_CLOCK + tmp / 2) / tmp;
+#else
+	/* For 440, the cpu clock is on divider chain A, UART on divider
+	 * chain B ... so cpu clock is irrelevant. Get the "optimized"
+	 * values that are subject to the 1/2 opb clock constraint
+	 */
+	serial_divs (gd->baudrate, &udiv, &bdiv);
+#endif
+
+	reg |= (udiv - UDIV_SUBTRACT) << CR0_UDIV_POS;	/* set the UART divisor */
+
+	/*
+	 * Configure input clock to baudrate generator for all
+	 * available serial ports here
+	 */
+	MTREG(UART0_SDR, reg);
+#if defined(UART1_SDR)
+	MTREG(UART1_SDR, reg);
+#endif
+#if defined(UART2_SDR)
+	MTREG(UART2_SDR, reg);
+#endif
+#if defined(UART3_SDR)
+	MTREG(UART3_SDR, reg);
+#endif
+
+	out8(dev_base + UART_LCR, 0x80);	/* set DLAB bit */
+	out8(dev_base + UART_DLL, bdiv);	/* set baudrate divisor */
+	out8(dev_base + UART_DLM, bdiv >> 8);	/* set baudrate divisor */
+	out8(dev_base + UART_LCR, 0x03);	/* clear DLAB; set 8 bits, no parity */
+	out8(dev_base + UART_FCR, 0x00);	/* disable FIFO */
+	out8(dev_base + UART_MCR, 0x10);	/* enable loopback mode */
+	val = in8(dev_base + UART_LSR);		/* clear line status */
+	val = in8(dev_base + UART_RBR);		/* read receive buffer */
+	out8(dev_base + UART_SCR, 0x00);	/* set scratchpad */
+	out8(dev_base + UART_IER, 0x00);	/* set interrupt enable reg */
+
+	return 0;
+}
+
+static void uart_post_putc (unsigned long dev_base, char c)
+{
+	int i;
+
+	out8 (dev_base + UART_THR, c);	/* put character out */
+
+	/* Wait for transfer completion */
+	for (i = 0; i < 3500; i++) {
+		if (in8 (dev_base + UART_LSR) & asyncLSRTxHoldEmpty1)
+			break;
+		udelay (100);
+	}
+}
+
+static int uart_post_getc (unsigned long dev_base)
+{
+	int i;
+
+	/* Wait for character available */
+	for (i = 0; i < 3500; i++) {
+		if (in8 (dev_base + UART_LSR) & asyncLSRDataReady1)
+			break;
+		udelay (100);
+	}
+	return 0xff & in8 (dev_base + UART_RBR);
+}
+
+static int test_ctlr (unsigned long dev_base, int index)
+{
+	int res = -1;
+	char test_str[] = "*** UART Test String ***\r\n";
+	int i;
+
+	uart_post_init (dev_base);
+
+	for (i = 0; i < sizeof (test_str) - 1; i++) {
+		uart_post_putc (dev_base, test_str[i]);
+		if (uart_post_getc (dev_base) != test_str[i])
+			goto done;
+	}
+	res = 0;
+done:
+	if (res)
+		post_log ("uart%d test failed\n", index);
+
+	return res;
+}
+
+int uart_post_test (int flags)
+{
+	int i, res = 0;
+	static unsigned long base[] = {
+		UART0_BASE, UART1_BASE, UART2_BASE, UART3_BASE
+	};
+
+	for (i = 0; i < sizeof (base) / sizeof (base[0]); i++) {
+		if (test_ctlr (base[i], i))
+			res = -1;
+	}
+	serial_reinit_all ();
+
+	return res;
+}
+
+#endif /* CONFIG_POST & CFG_POST_UART */
+
+#endif /* CONFIG_POST */