diff -urN linux.old/drivers/mtd/nand/Kconfig linux.dev/drivers/mtd/nand/Kconfig
--- linux.old/drivers/mtd/nand/Kconfig	2006-11-29 22:57:37.000000000 +0100
+++ linux.dev/drivers/mtd/nand/Kconfig	2006-12-14 04:38:51.000000000 +0100
@@ -75,6 +75,12 @@
 	help
 	  Support for NAND flash on Technologic Systems TS-7250 platform.
 
+config MTD_NAND_RB500
+	tristate "NAND Flash device on RB500 board"
+	depends on MTD_NAND
+	help
+	  Support for NAND flash on RB500 platform.
+
 config MTD_NAND_IDS
 	tristate
 
diff -urN linux.old/drivers/mtd/nand/Makefile linux.dev/drivers/mtd/nand/Makefile
--- linux.old/drivers/mtd/nand/Makefile	2006-11-29 22:57:37.000000000 +0100
+++ linux.dev/drivers/mtd/nand/Makefile	2006-12-14 04:38:51.000000000 +0100
@@ -9,6 +9,7 @@
 obj-$(CONFIG_MTD_NAND_SPIA)		+= spia.o
 obj-$(CONFIG_MTD_NAND_AMS_DELTA)	+= ams-delta.o
 obj-$(CONFIG_MTD_NAND_TOTO)		+= toto.o
+obj-$(CONFIG_MTD_NAND_RB500)		+= rbmipsnand.o
 obj-$(CONFIG_MTD_NAND_AUTCPU12)		+= autcpu12.o
 obj-$(CONFIG_MTD_NAND_EDB7312)		+= edb7312.o
 obj-$(CONFIG_MTD_NAND_AU1550)		+= au1550nd.o
diff -urN linux.old/drivers/mtd/nand/rbmipsnand.c linux.dev/drivers/mtd/nand/rbmipsnand.c
--- linux.old/drivers/mtd/nand/rbmipsnand.c	1970-01-01 01:00:00.000000000 +0100
+++ linux.dev/drivers/mtd/nand/rbmipsnand.c	2006-12-14 04:39:52.000000000 +0100
@@ -0,0 +1,137 @@
+#include <linux/init.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/bootinfo.h>
+
+#define IDT434_REG_BASE ((volatile void *) KSEG1ADDR(0x18000000))
+
+#define GPIOF 0x050000
+#define GPIOC 0x050004
+#define GPIOD 0x050008
+
+#define GPIO_RDY (1 << 0x08)
+#define GPIO_WPX (1 << 0x09)
+#define GPIO_ALE (1 << 0x0a)
+#define GPIO_CLE (1 << 0x0b)
+
+#define DEV2BASE 0x010020
+
+#define LO_WPX   (1 << 0)
+#define LO_ALE   (1 << 1)
+#define LO_CLE   (1 << 2)
+#define LO_CEX   (1 << 3)
+#define LO_FOFF  (1 << 5)
+#define LO_SPICS (1 << 6)
+#define LO_ULED  (1 << 7)
+
+#define MEM32(x) *((volatile unsigned *) (x))
+static void __iomem *p_nand;
+
+extern void changeLatchU5(unsigned char orMask, unsigned char nandMask);
+
+static int rb500_dev_ready(struct mtd_info *mtd)
+{
+	return MEM32(IDT434_REG_BASE + GPIOD) & GPIO_RDY;
+}
+
+/*
+ * hardware specific access to control-lines
+ *
+ * ctrl:
+ *     NAND_CLE: bit 2 -> bit 3 
+ *     NAND_ALE: bit 3 -> bit 2
+ */
+static void rbmips_hwcontrol500(struct mtd_info *mtd, int cmd,
+				unsigned int ctrl)
+{
+	struct nand_chip *chip = mtd->priv;
+	unsigned char orbits, nandbits;
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+
+		orbits = (ctrl & NAND_CLE) << 1;
+		orbits |= (ctrl & NAND_ALE) >> 1;
+
+		nandbits = (~ctrl & NAND_CLE) << 1;
+		nandbits |= (~ctrl & NAND_ALE) >> 1;
+
+		changeLatchU5(orbits, nandbits);
+	}
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, chip->IO_ADDR_W);
+
+}
+
+static struct mtd_partition partition_info[] = {
+	{
+	      name:"RouterBoard NAND Boot",
+	      offset:0,
+      size:4 * 1024 * 1024},
+	{
+	      name:"RouterBoard NAND Main",
+	      offset:MTDPART_OFS_NXTBLK,
+      size:MTDPART_SIZ_FULL}
+};
+
+static struct mtd_info rmtd;
+static struct nand_chip rnand;
+
+static unsigned init_ok = 0;
+
+unsigned get_rbnand_block_size(void)
+{
+	if (init_ok)
+		return rmtd.writesize;
+	else
+		return 0;
+}
+
+EXPORT_SYMBOL(get_rbnand_block_size);
+
+int __init rbmips_init(void)
+{
+	int *b;
+	memset(&rmtd, 0, sizeof(rmtd));
+	memset(&rnand, 0, sizeof(rnand));
+
+	printk("RB500 nand\n");
+	changeLatchU5(LO_WPX | LO_FOFF | LO_CEX,
+		      LO_ULED | LO_ALE | LO_CLE);
+	rnand.cmd_ctrl = rbmips_hwcontrol500;
+
+	rnand.dev_ready = rb500_dev_ready;
+	rnand.IO_ADDR_W = (unsigned char *)
+	    KSEG1ADDR(MEM32(IDT434_REG_BASE + DEV2BASE));
+	rnand.IO_ADDR_R = rnand.IO_ADDR_W;
+
+	p_nand = (void __iomem *) ioremap((void *) 0x18a20000, 0x1000);
+	if (!p_nand) {
+		printk("RBnand Unable ioremap buffer");
+		return -ENXIO;
+	}
+	rnand.ecc.mode = NAND_ECC_SOFT;
+	rnand.chip_delay = 25;
+	rnand.options |= NAND_NO_AUTOINCR;
+	rmtd.priv = &rnand;
+
+	b = (int *) KSEG1ADDR(0x18010020);
+	printk("dev2base 0x%08x mask 0x%08x c 0x%08x tc 0x%08x\n", b[0],
+	       b[1], b[2], b[3]);
+
+	if (nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)
+	    && nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)) {
+		printk("RBxxx nand device not found\n");
+		iounmap((void *) p_nand);
+		return -ENXIO;
+	}
+
+	add_mtd_partitions(&rmtd, partition_info, 2);
+	init_ok = 1;
+	return 0;
+}
+
+module_init(rbmips_init);
