nios2: Move cpu/nios2/* to arch/nios2/cpu/*

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

9 files changed, 1592 insertions, 0 deletions

diff --git a/arch/nios2/cpu/Makefile b/arch/nios2/cpu/Makefile
new file mode 100644
index 0000000..3dfaa83
--- /dev/null
+++ b/arch/nios2/cpu/Makefile
@@ -0,0 +1,48 @@
+#
+# (C) Copyright 2000-2006
+# 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 $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(CPU).a
+
+START	= start.o
+SOBJS	= exceptions.o
+COBJS	= cpu.o interrupts.o sysid.o traps.o epcs.o
+
+SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+START	:= $(addprefix $(obj),$(START))
+
+all:	$(obj).depend $(START) $(LIB)
+
+$(LIB):	$(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/arch/nios2/cpu/config.mk b/arch/nios2/cpu/config.mk
new file mode 100644
index 0000000..f228d72
--- /dev/null
+++ b/arch/nios2/cpu/config.mk
@@ -0,0 +1,24 @@
+#
+# (C) Copyright 2000
+# 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
+#
+
+PLATFORM_RELFLAGS +=
diff --git a/arch/nios2/cpu/cpu.c b/arch/nios2/cpu/cpu.c
new file mode 100644
index 0000000..6379534
--- /dev/null
+++ b/arch/nios2/cpu/cpu.c
@@ -0,0 +1,50 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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>
+#include <nios2.h>
+#include <nios2-io.h>
+
+#if defined (CONFIG_SYS_NIOS_SYSID_BASE)
+extern void display_sysid (void);
+#endif /* CONFIG_SYS_NIOS_SYSID_BASE */
+
+int checkcpu (void)
+{
+	printf ("CPU   : Nios-II\n");
+#if !defined(CONFIG_SYS_NIOS_SYSID_BASE)
+	printf ("SYSID : <unknown>\n");
+#else
+	display_sysid ();
+#endif
+	return (0);
+}
+
+
+int do_reset (void)
+{
+	void (*rst)(void) = (void(*)(void))CONFIG_SYS_RESET_ADDR;
+	disable_interrupts ();
+	rst();
+	return(0);
+}
diff --git a/arch/nios2/cpu/epcs.c b/arch/nios2/cpu/epcs.c
new file mode 100644
index 0000000..ab7d746
--- /dev/null
+++ b/arch/nios2/cpu/epcs.c
@@ -0,0 +1,733 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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>
+
+#if defined(CONFIG_SYS_NIOS_EPCSBASE)
+#include <command.h>
+#include <asm/io.h>
+#include <nios2-io.h>
+#include <nios2-epcs.h>
+
+
+/*-----------------------------------------------------------------------*/
+#define SHORT_HELP\
+	"epcs    - read/write Cyclone EPCS configuration device.\n"
+
+#define LONG_HELP\
+	"\n"\
+	"epcs erase start [end]\n"\
+	"    - erase sector start or sectors start through end.\n"\
+	"epcs info\n"\
+	"    - display EPCS device information.\n"\
+	"epcs protect on | off\n"\
+	"    - turn device protection on or off.\n"\
+	"epcs read addr offset count\n"\
+	"    - read count bytes from offset to addr.\n"\
+	"epcs write addr offset count\n"\
+	"    - write count bytes to offset from addr.\n"\
+	"epcs verify addr offset count\n"\
+	"    - verify count bytes at offset from addr."
+
+
+/*-----------------------------------------------------------------------*/
+/* Operation codes for serial configuration devices
+ */
+#define EPCS_WRITE_ENA		0x06	/* Write enable */
+#define EPCS_WRITE_DIS		0x04	/* Write disable */
+#define EPCS_READ_STAT		0x05	/* Read status */
+#define EPCS_READ_BYTES		0x03	/* Read bytes */
+#define EPCS_READ_ID		0xab	/* Read silicon id */
+#define EPCS_WRITE_STAT		0x01	/* Write status */
+#define EPCS_WRITE_BYTES	0x02	/* Write bytes */
+#define EPCS_ERASE_BULK		0xc7	/* Erase entire device */
+#define EPCS_ERASE_SECT		0xd8	/* Erase sector */
+
+/* Device status register bits
+ */
+#define EPCS_STATUS_WIP		(1<<0)	/* Write in progress */
+#define EPCS_STATUS_WEL		(1<<1)	/* Write enable latch */
+
+/* Misc
+ */
+#define EPCS_TIMEOUT		100	/* 100 msec timeout */
+
+static nios_spi_t *epcs = (nios_spi_t *)CONFIG_SYS_NIOS_EPCSBASE;
+
+/***********************************************************************
+ * Device access
+ ***********************************************************************/
+static int epcs_cs (int assert)
+{
+	ulong start;
+	unsigned tmp;
+
+
+	if (assert) {
+		tmp = readl (&epcs->control);
+		writel (tmp | NIOS_SPI_SSO, &epcs->control);
+	} else {
+		/* Let all bits shift out */
+		start = get_timer (0);
+		while ((readl (&epcs->status) & NIOS_SPI_TMT) == 0)
+			if (get_timer (start) > EPCS_TIMEOUT)
+				return (-1);
+		tmp = readl (&epcs->control);
+		writel (tmp & ~NIOS_SPI_SSO, &epcs->control);
+	}
+	return (0);
+}
+
+static int epcs_tx (unsigned char c)
+{
+	ulong start;
+
+	start = get_timer (0);
+	while ((readl (&epcs->status) & NIOS_SPI_TRDY) == 0)
+		if (get_timer (start) > EPCS_TIMEOUT)
+			return (-1);
+	writel (c, &epcs->txdata);
+	return (0);
+}
+
+static int epcs_rx (void)
+{
+	ulong start;
+
+	start = get_timer (0);
+	while ((readl (&epcs->status) & NIOS_SPI_RRDY) == 0)
+		if (get_timer (start) > EPCS_TIMEOUT)
+			return (-1);
+	return (readl (&epcs->rxdata));
+}
+
+static unsigned char bitrev[] = {
+	0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e,
+	0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b, 0x07, 0x0f
+};
+
+static unsigned char epcs_bitrev (unsigned char c)
+{
+	unsigned char val;
+
+	val  = bitrev[c>>4];
+	val |= bitrev[c & 0x0f]<<4;
+	return (val);
+}
+
+static void epcs_rcv (unsigned char *dst, int len)
+{
+	while (len--) {
+		epcs_tx (0);
+		*dst++ = epcs_rx ();
+	}
+}
+
+static void epcs_rrcv (unsigned char *dst, int len)
+{
+	while (len--) {
+		epcs_tx (0);
+		*dst++ = epcs_bitrev (epcs_rx ());
+	}
+}
+
+static void epcs_snd (unsigned char *src, int len)
+{
+	while (len--) {
+		epcs_tx (*src++);
+		epcs_rx ();
+	}
+}
+
+static void epcs_rsnd (unsigned char *src, int len)
+{
+	while (len--) {
+		epcs_tx (epcs_bitrev (*src++));
+		epcs_rx ();
+	}
+}
+
+static void epcs_wr_enable (void)
+{
+	epcs_cs (1);
+	epcs_tx (EPCS_WRITE_ENA);
+	epcs_rx ();
+	epcs_cs (0);
+}
+
+static unsigned char epcs_status_rd (void)
+{
+	unsigned char status;
+
+	epcs_cs (1);
+	epcs_tx (EPCS_READ_STAT);
+	epcs_rx ();
+	epcs_tx (0);
+	status = epcs_rx ();
+	epcs_cs (0);
+	return (status);
+}
+
+static void epcs_status_wr (unsigned char status)
+{
+	epcs_wr_enable ();
+	epcs_cs (1);
+	epcs_tx (EPCS_WRITE_STAT);
+	epcs_rx ();
+	epcs_tx (status);
+	epcs_rx ();
+	epcs_cs (0);
+	return;
+}
+
+/***********************************************************************
+ * Device information
+ ***********************************************************************/
+
+static struct epcs_devinfo_t devinfo[] = {
+	{ "EPCS1 ", 0x10, 17, 4, 15, 8, 0x0c },
+	{ "EPCS4 ", 0x12, 19, 8, 16, 8, 0x1c },
+	{ "EPCS16", 0x14, 21, 32, 16, 8, 0x1c },
+	{ "EPCS64", 0x16, 23,128, 16, 8, 0x1c },
+	{ 0, 0, 0, 0, 0, 0 }
+};
+
+int epcs_reset (void)
+{
+	/* When booting from an epcs controller, the epcs bootrom
+	 * code may leave the slave select in an asserted state.
+	 * This causes two problems: (1) The initial epcs access
+	 * will fail -- not a big deal, and (2) a software reset
+	 * will cause the bootrom code to hang since it does not
+	 * ensure the select is negated prior to first access -- a
+	 * big deal. Here we just negate chip select and everything
+	 * gets better :-)
+	 */
+	epcs_cs (0); /* Negate chip select */
+	return (0);
+}
+
+epcs_devinfo_t *epcs_dev_find (void)
+{
+	unsigned char buf[4];
+	unsigned char id;
+	int i;
+	struct epcs_devinfo_t *dev = NULL;
+
+	/* Read silicon id requires 3 "dummy bytes" before it's put
+	 * on the wire.
+	 */
+	buf[0] = EPCS_READ_ID;
+	buf[1] = 0;
+	buf[2] = 0;
+	buf[3] = 0;
+
+	epcs_cs (1);
+	epcs_snd (buf,4);
+	epcs_rcv (buf,1);
+	if (epcs_cs (0) == -1)
+		return (NULL);
+	id = buf[0];
+
+	/* Find the info struct */
+	i = 0;
+	while (devinfo[i].name) {
+		if (id == devinfo[i].id) {
+			dev = &devinfo[i];
+			break;
+		}
+		i++;
+	}
+
+	return (dev);
+}
+
+/***********************************************************************
+ * Misc Utilities
+ ***********************************************************************/
+int epcs_cfgsz (void)
+{
+	int sz = 0;
+	unsigned char buf[128];
+	unsigned char *p;
+	struct epcs_devinfo_t *dev = epcs_dev_find ();
+
+	if (!dev)
+		return (-1);
+
+	/* Read in the first 128 bytes of the device */
+	buf[0] = EPCS_READ_BYTES;
+	buf[1] = 0;
+	buf[2] = 0;
+	buf[3] = 0;
+
+	epcs_cs (1);
+	epcs_snd (buf,4);
+	epcs_rrcv (buf, sizeof(buf));
+	epcs_cs (0);
+
+	/* Search for the starting 0x6a which is followed by the
+	 * 4-byte 'register' and 4-byte bit-count.
+	 */
+	p = buf;
+	while (p < buf + sizeof(buf)-8) {
+		if ( *p == 0x6a ) {
+			/* Point to bit count and extract */
+			p += 5;
+			sz = *p++;
+			sz |= *p++ << 8;
+			sz |= *p++ << 16;
+			sz |= *p++ << 24;
+			/* Convert to byte count */
+			sz += 7;
+			sz >>= 3;
+		} else if (*p == 0xff) {
+			/* 0xff is ok ... just skip */
+			p++;
+			continue;
+		} else {
+			/* Not 0xff or 0x6a ... something's not
+			 * right ... report 'unknown' (sz=0).
+			 */
+			break;
+		}
+	}
+	return (sz);
+}
+
+int epcs_erase (unsigned start, unsigned end)
+{
+	unsigned off, sectsz;
+	unsigned char buf[4];
+	struct epcs_devinfo_t *dev = epcs_dev_find ();
+
+	if (!dev || (start>end))
+		return (-1);
+
+	/* Erase the requested sectors. An address is required
+	 * that lies within the requested sector -- we'll just
+	 * use the first address in the sector.
+	 */
+	printf ("epcs erasing sector %d ", start);
+	if (start != end)
+		printf ("to %d ", end);
+	sectsz = (1 << dev->sz_sect);
+	while (start <= end) {
+		off = start * sectsz;
+		start++;
+
+		buf[0] = EPCS_ERASE_SECT;
+		buf[1] = off >> 16;
+		buf[2] = off >> 8;
+		buf[3] = off;
+
+		epcs_wr_enable ();
+		epcs_cs (1);
+		epcs_snd (buf,4);
+		epcs_cs (0);
+
+		printf ("."); /* Some user feedback */
+
+		/* Wait for erase to complete */
+		while (epcs_status_rd() & EPCS_STATUS_WIP)
+			;
+	}
+	printf (" done.\n");
+	return (0);
+}
+
+int epcs_read (ulong addr, ulong off, ulong cnt)
+{
+	unsigned char buf[4];
+	struct epcs_devinfo_t *dev = epcs_dev_find ();
+
+	if (!dev)
+		return (-1);
+
+	buf[0] = EPCS_READ_BYTES;
+	buf[1] = off >> 16;
+	buf[2] = off >> 8;
+	buf[3] = off;
+
+	epcs_cs (1);
+	epcs_snd (buf,4);
+	epcs_rrcv ((unsigned char *)addr, cnt);
+	epcs_cs (0);
+
+	return (0);
+}
+
+int epcs_write (ulong addr, ulong off, ulong cnt)
+{
+	ulong wrcnt;
+	unsigned pgsz;
+	unsigned char buf[4];
+	struct epcs_devinfo_t *dev = epcs_dev_find ();
+
+	if (!dev)
+		return (-1);
+
+	pgsz = (1<<dev->sz_page);
+	while (cnt) {
+		if (off % pgsz)
+			wrcnt = pgsz - (off % pgsz);
+		else
+			wrcnt = pgsz;
+		wrcnt = (wrcnt > cnt) ? cnt : wrcnt;
+
+		buf[0] = EPCS_WRITE_BYTES;
+		buf[1] = off >> 16;
+		buf[2] = off >> 8;
+		buf[3] = off;
+
+		epcs_wr_enable ();
+		epcs_cs (1);
+		epcs_snd (buf,4);
+		epcs_rsnd ((unsigned char *)addr, wrcnt);
+		epcs_cs (0);
+
+		/* Wait for write to complete */
+		while (epcs_status_rd() & EPCS_STATUS_WIP)
+			;
+
+		cnt -= wrcnt;
+		off += wrcnt;
+		addr += wrcnt;
+	}
+
+	return (0);
+}
+
+int epcs_verify (ulong addr, ulong off, ulong cnt, ulong *err)
+{
+	ulong rdcnt;
+	unsigned char buf[256];
+	unsigned char *start,*end;
+	int i;
+
+	start = end = (unsigned char *)addr;
+	while (cnt) {
+		rdcnt = (cnt>sizeof(buf)) ? sizeof(buf) : cnt;
+		epcs_read ((ulong)buf, off, rdcnt);
+		for (i=0; i<rdcnt; i++) {
+			if (*end != buf[i]) {
+				*err = end - start;
+				return(-1);
+			}
+			end++;
+		}
+		cnt -= rdcnt;
+		off += rdcnt;
+	}
+	return (0);
+}
+
+static int epcs_sect_erased (int sect, unsigned *offset,
+		struct epcs_devinfo_t *dev)
+{
+	unsigned char buf[128];
+	unsigned off, end;
+	unsigned sectsz;
+	int i;
+
+	sectsz = (1 << dev->sz_sect);
+	off = sectsz * sect;
+	end = off + sectsz;
+
+	while (off < end) {
+		epcs_read ((ulong)buf, off, sizeof(buf));
+		for (i=0; i < sizeof(buf); i++) {
+			if (buf[i] != 0xff) {
+				*offset = off + i;
+				return (0);
+			}
+		}
+		off += sizeof(buf);
+	}
+	return (1);
+}
+
+
+/***********************************************************************
+ * Commands
+ ***********************************************************************/
+static
+void do_epcs_info (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+	int i;
+	unsigned char stat;
+	unsigned tmp;
+	int erased;
+
+	/* Basic device info */
+	printf ("%s: %d kbytes (%d sectors x %d kbytes,"
+		" %d bytes/page)\n",
+		dev->name, 1 << (dev->size-10),
+		dev->num_sects, 1 << (dev->sz_sect-10),
+		1 << dev->sz_page );
+
+	/* Status -- for now protection is all-or-nothing */
+	stat = epcs_status_rd();
+	printf ("status: 0x%02x (WIP:%d, WEL:%d, PROT:%s)\n",
+		stat,
+		(stat & EPCS_STATUS_WIP) ? 1 : 0,
+	        (stat & EPCS_STATUS_WEL) ? 1 : 0,
+		(stat & dev->prot_mask) ? "on" : "off" );
+
+	/* Configuration  */
+	tmp = epcs_cfgsz ();
+	if (tmp) {
+		printf ("config: 0x%06x (%d) bytes\n", tmp, tmp );
+	} else {
+		printf ("config: unknown\n" );
+	}
+
+	/* Sector info */
+	for (i=0; (i < dev->num_sects) && (argc > 1); i++) {
+		erased = epcs_sect_erased (i, &tmp, dev);
+		if ((i & 0x03) == 0) printf ("\n");
+		printf ("%4d: %07x ",
+			i, i*(1<<dev->sz_sect) );
+		if (erased)
+			printf ("E ");
+		else
+			printf ("  ");
+	}
+	printf ("\n");
+
+	return;
+}
+
+static
+void do_epcs_erase (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+	unsigned start,end;
+
+	if ((argc < 3) || (argc > 4)) {
+		printf ("USAGE: epcs erase sect [end]\n");
+		return;
+	}
+	if ((epcs_status_rd() & dev->prot_mask) != 0) {
+		printf ( "epcs: device protected.\n");
+		return;
+	}
+
+	start = simple_strtoul (argv[2], NULL, 10);
+	if (argc > 3)
+		end = simple_strtoul (argv[3], NULL, 10);
+	else
+		end = start;
+	if ((start >= dev->num_sects) || (start > end)) {
+		printf ("epcs: invalid sector range: [%d:%d]\n",
+			start, end );
+		return;
+	}
+
+	epcs_erase (start, end);
+
+	return;
+}
+
+static
+void do_epcs_protect (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+	unsigned char stat;
+
+	/* For now protection is all-or-nothing to keep things
+	 * simple. The protection bits don't map in a linear
+	 * fashion ... and we would rather protect the bottom
+	 * of the device since it contains the config data and
+	 * leave the top unprotected for app use. But unfortunately
+	 * protection works from top-to-bottom so it does
+	 * really help very much from a software app point-of-view.
+	 */
+	if (argc < 3) {
+		printf ("USAGE: epcs protect on | off\n");
+		return;
+	}
+	if (!dev)
+		return;
+
+	/* Protection on/off is just a matter of setting/clearing
+	 * all protection bits in the status register.
+	 */
+	stat = epcs_status_rd ();
+	if (strcmp ("on", argv[2]) == 0) {
+		stat |= dev->prot_mask;
+	} else if (strcmp ("off", argv[2]) == 0 ) {
+		stat &= ~dev->prot_mask;
+	} else {
+		printf ("epcs: unknown protection: %s\n", argv[2]);
+		return;
+	}
+	epcs_status_wr (stat);
+	return;
+}
+
+static
+void do_epcs_read (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+	ulong addr,off,cnt;
+	ulong sz;
+
+	if (argc < 5) {
+		printf ("USAGE: epcs read addr offset count\n");
+		return;
+	}
+
+	sz = 1 << dev->size;
+	addr = simple_strtoul (argv[2], NULL, 16);
+	off  = simple_strtoul (argv[3], NULL, 16);
+	cnt  = simple_strtoul (argv[4], NULL, 16);
+	if (off > sz) {
+		printf ("offset is greater than device size"
+			"... aborting.\n");
+		return;
+	}
+	if ((off + cnt) > sz) {
+		printf ("request exceeds device size"
+			"... truncating.\n");
+		cnt = sz - off;
+	}
+	printf ("epcs: read %08lx <- %06lx (0x%lx bytes)\n",
+			addr, off, cnt);
+	epcs_read (addr, off, cnt);
+
+	return;
+}
+
+static
+void do_epcs_write (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+	ulong addr,off,cnt;
+	ulong sz;
+	ulong err;
+
+	if (argc < 5) {
+		printf ("USAGE: epcs write addr offset count\n");
+		return;
+	}
+	if ((epcs_status_rd() & dev->prot_mask) != 0) {
+		printf ( "epcs: device protected.\n");
+		return;
+	}
+
+	sz = 1 << dev->size;
+	addr = simple_strtoul (argv[2], NULL, 16);
+	off  = simple_strtoul (argv[3], NULL, 16);
+	cnt  = simple_strtoul (argv[4], NULL, 16);
+	if (off > sz) {
+		printf ("offset is greater than device size"
+			"... aborting.\n");
+		return;
+	}
+	if ((off + cnt) > sz) {
+		printf ("request exceeds device size"
+			"... truncating.\n");
+		cnt = sz - off;
+	}
+	printf ("epcs: write %08lx -> %06lx (0x%lx bytes)\n",
+			addr, off, cnt);
+	epcs_write (addr, off, cnt);
+	if (epcs_verify (addr, off, cnt, &err) != 0)
+		printf ("epcs: write error at offset %06lx\n", err);
+
+	return;
+}
+
+static
+void do_epcs_verify (struct epcs_devinfo_t *dev, int argc, char *argv[])
+{
+	ulong addr,off,cnt;
+	ulong sz;
+	ulong err;
+
+	if (argc < 5) {
+		printf ("USAGE: epcs verify addr offset count\n");
+		return;
+	}
+
+	sz = 1 << dev->size;
+	addr = simple_strtoul (argv[2], NULL, 16);
+	off  = simple_strtoul (argv[3], NULL, 16);
+	cnt  = simple_strtoul (argv[4], NULL, 16);
+	if (off > sz) {
+		printf ("offset is greater than device size"
+			"... aborting.\n");
+		return;
+	}
+	if ((off + cnt) > sz) {
+		printf ("request exceeds device size"
+			"... truncating.\n");
+		cnt = sz - off;
+	}
+	printf ("epcs: verify %08lx -> %06lx (0x%lx bytes)\n",
+			addr, off, cnt);
+	if (epcs_verify (addr, off, cnt, &err) != 0)
+		printf ("epcs: verify error at offset %06lx\n", err);
+
+	return;
+}
+
+/*-----------------------------------------------------------------------*/
+int do_epcs (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	int len;
+	struct epcs_devinfo_t *dev = epcs_dev_find ();
+
+	if (!dev) {
+		printf ("epcs: device not found.\n");
+		return (-1);
+	}
+
+	if (argc < 2) {
+		do_epcs_info (dev, argc, argv);
+		return (0);
+	}
+
+	len = strlen (argv[1]);
+	if (strncmp ("info", argv[1], len) == 0) {
+		do_epcs_info (dev, argc, argv);
+	} else if (strncmp ("erase", argv[1], len) == 0) {
+		do_epcs_erase (dev, argc, argv);
+	} else if (strncmp ("protect", argv[1], len) == 0) {
+		do_epcs_protect (dev, argc, argv);
+	} else if (strncmp ("read", argv[1], len) == 0) {
+		do_epcs_read (dev, argc, argv);
+	} else if (strncmp ("write", argv[1], len) == 0) {
+		do_epcs_write (dev, argc, argv);
+	} else if (strncmp ("verify", argv[1], len) == 0) {
+		do_epcs_verify (dev, argc, argv);
+	} else {
+		printf ("epcs: unknown operation: %s\n", argv[1]);
+	}
+
+	return (0);
+}
+
+/*-----------------------------------------------------------------------*/
+
+
+U_BOOT_CMD( epcs, 5, 0, do_epcs, SHORT_HELP, LONG_HELP );
+
+#endif /* CONFIG_NIOS_EPCS */
diff --git a/arch/nios2/cpu/exceptions.S b/arch/nios2/cpu/exceptions.S
new file mode 100644
index 0000000..b9c7a58
--- /dev/null
+++ b/arch/nios2/cpu/exceptions.S
@@ -0,0 +1,155 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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 <config.h>
+#include <asm/opcodes.h>
+
+
+	.text
+	.align	4
+
+	.global _exception
+
+	.set noat
+	.set nobreak
+
+_exception:
+	/* SAVE ALL REGS -- this allows trap and unimplemented
+	 * instruction handlers to be coded conveniently in C
+	 */
+	addi	sp, sp, -(33*4)
+	stw	r0, 0(sp)
+	stw	r1, 4(sp)
+	stw	r2, 8(sp)
+	stw	r3, 12(sp)
+	stw	r4, 16(sp)
+	stw	r5, 20(sp)
+	stw	r6, 24(sp)
+	stw	r7, 28(sp)
+	stw	r8, 32(sp)
+	stw	r9, 36(sp)
+	stw	r10, 40(sp)
+	stw	r11, 44(sp)
+	stw	r12, 48(sp)
+	stw	r13, 52(sp)
+	stw	r14, 56(sp)
+	stw	r15, 60(sp)
+	stw	r16, 64(sp)
+	stw	r17, 68(sp)
+	stw	r19, 72(sp)
+	stw	r19, 76(sp)
+	stw	r20, 80(sp)
+	stw	r21, 84(sp)
+	stw	r22, 88(sp)
+	stw	r23, 92(sp)
+	stw	r24, 96(sp)
+	stw	r25, 100(sp)
+	stw	r26, 104(sp)
+	stw	r27, 108(sp)
+	stw	r28, 112(sp)
+	stw	r29, 116(sp)
+	stw	r30, 120(sp)
+	stw	r31, 124(sp)
+	rdctl	et, estatus
+	stw	et, 128(sp)
+
+	/* If interrupts are disabled -- software interrupt */
+	rdctl	et, estatus
+	andi	et, et, 1
+	beq	et, r0, 0f
+
+	/* If no interrupts are pending -- software interrupt */
+	rdctl	et, ipending
+	beq	et, r0, 0f
+
+	/* HARDWARE INTERRUPT: Call interrupt handler */
+	movhi	r3, %hi(external_interrupt)
+	ori	r3, r3, %lo(external_interrupt)
+	mov	r4, sp		/* ptr to regs */
+	callr	r3
+
+	/* Return address fixup: execution resumes by re-issue of
+	 * interrupted instruction at ea-4 (ea == r29). Here we do
+	 * simple fixup to allow common exception return.
+	 */
+	ldw	r3, 116(sp)
+	addi	r3, r3, -4
+	stw	r3, 116(sp)
+	br	_exception_return
+
+0:
+	/* TRAP EXCEPTION */
+	movhi	r3, %hi(OPC_TRAP)
+	ori	r3, r3, %lo(OPC_TRAP)
+	addi	r1, ea, -4
+	ldw	r1, 0(r1)
+	bne	r1, r3, 1f
+	movhi	r3, %hi(trap_handler)
+	ori	r3, r3, %lo(trap_handler)
+	mov	r4, sp		/* ptr to regs */
+	callr	r3
+	br	_exception_return
+
+1:
+	/* UNIMPLEMENTED INSTRUCTION EXCEPTION */
+	movhi	r3, %hi(soft_emulation)
+	ori	r3, r3, %lo(soft_emulation)
+	mov	r4, sp		/* ptr to regs */
+	callr	r3
+
+	/* Restore regsisters and return from exception*/
+_exception_return:
+	ldw	r1, 4(sp)
+	ldw	r2, 8(sp)
+	ldw	r3, 12(sp)
+	ldw	r4, 16(sp)
+	ldw	r5, 20(sp)
+	ldw	r6, 24(sp)
+	ldw	r7, 28(sp)
+	ldw	r8, 32(sp)
+	ldw	r9, 36(sp)
+	ldw	r10, 40(sp)
+	ldw	r11, 44(sp)
+	ldw	r12, 48(sp)
+	ldw	r13, 52(sp)
+	ldw	r14, 56(sp)
+	ldw	r15, 60(sp)
+	ldw	r16, 64(sp)
+	ldw	r17, 68(sp)
+	ldw	r19, 72(sp)
+	ldw	r19, 76(sp)
+	ldw	r20, 80(sp)
+	ldw	r21, 84(sp)
+	ldw	r22, 88(sp)
+	ldw	r23, 92(sp)
+	ldw	r24, 96(sp)
+	ldw	r25, 100(sp)
+	ldw	r26, 104(sp)
+	ldw	r27, 108(sp)
+	ldw	r28, 112(sp)
+	ldw	r29, 116(sp)
+	ldw	r30, 120(sp)
+	ldw	r31, 124(sp)
+	addi	sp, sp, (33*4)
+	eret
+/*-------------------------------------------------------------*/
diff --git a/arch/nios2/cpu/interrupts.c b/arch/nios2/cpu/interrupts.c
new file mode 100644
index 0000000..b552db4
--- /dev/null
+++ b/arch/nios2/cpu/interrupts.c
@@ -0,0 +1,265 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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 <nios2.h>
+#include <nios2-io.h>
+#include <asm/types.h>
+#include <asm/io.h>
+#include <asm/ptrace.h>
+#include <common.h>
+#include <command.h>
+#include <watchdog.h>
+#ifdef CONFIG_STATUS_LED
+#include <status_led.h>
+#endif
+
+#if defined(CONFIG_SYS_NIOS_TMRBASE) && !defined(CONFIG_SYS_NIOS_TMRIRQ)
+#error CONFIG_SYS_NIOS_TMRIRQ not defined (see documentation)
+#endif
+
+/****************************************************************************/
+
+struct	irq_action {
+	interrupt_handler_t *handler;
+	void *arg;
+	int count;
+};
+
+static struct irq_action vecs[32];
+
+/*************************************************************************/
+volatile ulong timestamp = 0;
+
+void reset_timer (void)
+{
+	nios_timer_t *tmr =(nios_timer_t *)CONFIG_SYS_NIOS_TMRBASE;
+
+	/* From Embedded Peripherals Handbook:
+	 *
+	 * "When the hardware is configured with Writeable period
+	 * disabled, writing to one of the period_n registers causes
+	 * the counter to reset to the fixed Timeout Period specified
+	 * at system generation time."
+	 *
+	 * Here we force a reload to prevent early timeouts from
+	 * get_timer() when the interrupt period is greater than
+	 * than 1 msec.
+	 *
+	 * Simply write to periodl with its own value to force an
+	 * internal counter reload, THEN reset the timestamp.
+	 */
+	writel (readl (&tmr->periodl), &tmr->periodl);
+	timestamp = 0;
+
+	/* From Embedded Peripherals Handbook:
+	 *
+	 * "Writing to one of the period_n registers stops the internal
+	 * counter, except when the hardware is configured with Start/Stop
+	 * control bits off. If Start/Stop control bits is off, writing
+	 * either register does not stop the counter."
+	 *
+	 * In order to accomodate either configuration, the control
+	 * register is re-written. If the counter is stopped, it will
+	 * be restarted. If it is running, the write is essentially
+	 * a nop.
+	 */
+	writel (NIOS_TIMER_ITO | NIOS_TIMER_CONT | NIOS_TIMER_START,
+			&tmr->control);
+
+}
+
+ulong get_timer (ulong base)
+{
+	WATCHDOG_RESET ();
+	return (timestamp - base);
+}
+
+void set_timer (ulong t)
+{
+	timestamp = t;
+}
+
+
+/* The board must handle this interrupt if a timer is not
+ * provided.
+ */
+#if defined(CONFIG_SYS_NIOS_TMRBASE)
+void tmr_isr (void *arg)
+{
+	nios_timer_t *tmr = (nios_timer_t *)arg;
+	/* Interrupt is cleared by writing anything to the
+	 * status register.
+	 */
+	writel (0, &tmr->status);
+	timestamp += CONFIG_SYS_NIOS_TMRMS;
+#ifdef CONFIG_STATUS_LED
+	status_led_tick(timestamp);
+#endif
+}
+
+static void tmr_init (void)
+{
+	nios_timer_t *tmr =(nios_timer_t *)CONFIG_SYS_NIOS_TMRBASE;
+
+	writel (0, &tmr->status);
+	writel (0, &tmr->control);
+	writel (NIOS_TIMER_STOP, &tmr->control);
+
+#if defined(CONFIG_SYS_NIOS_TMRCNT)
+	writel (CONFIG_SYS_NIOS_TMRCNT & 0xffff, &tmr->periodl);
+	writel ((CONFIG_SYS_NIOS_TMRCNT >> 16) & 0xffff, &tmr->periodh);
+#endif
+	writel (NIOS_TIMER_ITO | NIOS_TIMER_CONT | NIOS_TIMER_START,
+			&tmr->control);
+	irq_install_handler (CONFIG_SYS_NIOS_TMRIRQ, tmr_isr, (void *)tmr);
+}
+
+#endif /* CONFIG_SYS_NIOS_TMRBASE */
+
+/*************************************************************************/
+int disable_interrupts (void)
+{
+	int val = rdctl (CTL_STATUS);
+	wrctl (CTL_STATUS, val & ~STATUS_IE);
+	return (val & STATUS_IE);
+}
+
+void enable_interrupts( void )
+{
+	int val = rdctl (CTL_STATUS);
+	wrctl (CTL_STATUS, val | STATUS_IE);
+}
+
+void external_interrupt (struct pt_regs *regs)
+{
+	unsigned irqs;
+	struct irq_action *act;
+
+	/* Evaluate only irqs that are both enabled AND pending */
+	irqs = rdctl (CTL_IENABLE) & rdctl (CTL_IPENDING);
+	act = vecs;
+
+	/* Assume (as does the Nios2 HAL) that bit 0 is highest
+	 * priority. NOTE: There is ALWAYS a handler assigned
+	 * (the default if no other).
+	 */
+	while (irqs) {
+		if (irqs & 1) {
+			act->handler (act->arg);
+			act->count++;
+		}
+		irqs >>=1;
+		act++;
+	}
+}
+
+static void def_hdlr (void *arg)
+{
+	unsigned irqs = rdctl (CTL_IENABLE);
+
+	/* Disable the individual interrupt -- with gratuitous
+	 * warning.
+	 */
+	irqs &= ~(1 << (int)arg);
+	wrctl (CTL_IENABLE, irqs);
+	printf ("WARNING: Disabling unhandled interrupt: %d\n",
+			(int)arg);
+}
+
+/*************************************************************************/
+void irq_install_handler (int irq, interrupt_handler_t *hdlr, void *arg)
+{
+
+	int flag;
+	struct irq_action *act;
+	unsigned ena = rdctl (CTL_IENABLE);
+
+	if ((irq < 0) || (irq > 31))
+		return;
+	act = &vecs[irq];
+
+	flag = disable_interrupts ();
+	if (hdlr) {
+		act->handler = hdlr;
+		act->arg = arg;
+		ena |= (1 << irq);		/* enable */
+	} else {
+		act->handler = def_hdlr;
+		act->arg = (void *)irq;
+		ena &= ~(1 << irq);		/* disable */
+	}
+	wrctl (CTL_IENABLE, ena);
+	if (flag) enable_interrupts ();
+}
+
+
+int interrupt_init (void)
+{
+	int i;
+
+	/* Assign the default handler to all */
+	for (i = 0; i < 32; i++) {
+		vecs[i].handler = def_hdlr;
+		vecs[i].arg = (void *)i;
+		vecs[i].count = 0;
+	}
+
+#if defined(CONFIG_SYS_NIOS_TMRBASE)
+	tmr_init ();
+#endif
+
+	enable_interrupts ();
+	return (0);
+}
+
+
+/*************************************************************************/
+#if defined(CONFIG_CMD_IRQ)
+int do_irqinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	int i;
+	struct irq_action *act = vecs;
+
+	printf ("\nInterrupt-Information:\n\n");
+	printf ("Nr  Routine   Arg       Count\n");
+	printf ("-----------------------------\n");
+
+	for (i=0; i<32; i++) {
+		if (act->handler != def_hdlr) {
+			printf ("%02d  %08lx  %08lx  %d\n",
+				i,
+				(ulong)act->handler,
+				(ulong)act->arg,
+				act->count);
+		}
+		act++;
+	}
+	printf ("\n");
+
+	return (0);
+}
+#endif
diff --git a/arch/nios2/cpu/start.S b/arch/nios2/cpu/start.S
new file mode 100644
index 0000000..31cd5b0
--- /dev/null
+++ b/arch/nios2/cpu/start.S
@@ -0,0 +1,217 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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 <config.h>
+#include <timestamp.h>
+#include <version.h>
+
+/*************************************************************************
+ * RESTART
+ ************************************************************************/
+
+	.text
+	.global _start
+
+_start:
+	/* ICACHE INIT -- only the icache line at the reset address
+	 * is invalidated at reset. So the init must stay within
+	 * the cache line size (8 words). If GERMS is used, we'll
+	 * just be invalidating the cache a second time. If cache
+	 * is not implemented initi behaves as nop.
+	 */
+	ori	r4, r0, %lo(CONFIG_SYS_ICACHELINE_SIZE)
+	movhi	r5, %hi(CONFIG_SYS_ICACHE_SIZE)
+	ori	r5, r5, %lo(CONFIG_SYS_ICACHE_SIZE)
+	mov	r6, r0
+0:	initi	r6
+	add	r6, r6, r4
+	bltu	r6, r5, 0b
+	br	_except_end	/* Skip the tramp */
+
+	/* EXCEPTION TRAMPOLINE -- the following gets copied
+	 * to the exception address (below), but is otherwise at the
+	 * default exception vector offset (0x0020).
+	 */
+_except_start:
+	movhi	et, %hi(_exception)
+	ori	et, et, %lo(_exception)
+	jmp	et
+_except_end:
+
+	/* INTERRUPTS -- for now, all interrupts masked and globally
+	 * disabled.
+	 */
+	wrctl	status, r0		/* Disable interrupts */
+	wrctl	ienable, r0		/* All disabled	*/
+
+	/* DCACHE INIT -- if dcache not implemented, initd behaves as
+	 * nop.
+	 */
+	movhi	r4, %hi(CONFIG_SYS_DCACHELINE_SIZE)
+	ori	r4, r4, %lo(CONFIG_SYS_DCACHELINE_SIZE)
+	movhi	r5, %hi(CONFIG_SYS_DCACHE_SIZE)
+	ori	r5, r5, %lo(CONFIG_SYS_DCACHE_SIZE)
+	mov	r6, r0
+1:	initd	0(r6)
+	add	r6, r6, r4
+	bltu	r6, r5, 1b
+
+	/* RELOCATE CODE, DATA & COMMAND TABLE -- the following code
+	 * assumes code, data and the command table are all
+	 * contiguous. This lets us relocate everything as a single
+	 * block. Make sure the linker script matches this ;-)
+	 */
+	nextpc	r4
+_cur:	movhi	r5, %hi(_cur - _start)
+	ori	r5, r5, %lo(_cur - _start)
+	sub	r4, r4, r5		/* r4 <- cur _start */
+	mov	r8, r4
+	movhi	r5, %hi(_start)
+	ori	r5, r5, %lo(_start)	/* r5 <- linked _start */
+	beq	r4, r5, 3f
+
+	movhi	r6, %hi(_edata)
+	ori	r6, r6, %lo(_edata)
+2:	ldwio	r7, 0(r4)
+	addi	r4, r4, 4
+	stwio	r7, 0(r5)
+	addi	r5, r5, 4
+	bne	r5, r6, 2b
+3:
+
+	/* ZERO BSS/SBSS -- bss and sbss are assumed to be adjacent
+	 * and between __bss_start and _end.
+	 */
+	 movhi	r5, %hi(__bss_start)
+	 ori	r5, r5, %lo(__bss_start)
+	 movhi	r6, %hi(_end)
+	 ori	r6, r6, %lo(_end)
+	 beq	r5, r6, 5f
+
+4:	stwio	r0, 0(r5)
+	 addi	r5, r5, 4
+	 bne	r5, r6, 4b
+5:
+
+	/* GLOBAL POINTER -- the global pointer is used to reference
+	 * "small data" (see -G switch). The linker script must
+	 * provide the gp address.
+	 */
+	 movhi	gp, %hi(_gp)
+	 ori	gp, gp, %lo(_gp)
+
+	/* JUMP TO RELOC ADDR */
+	movhi	r4, %hi(_reloc)
+	ori	r4, r4, %lo(_reloc)
+	jmp	r4
+_reloc:
+
+	/* COPY EXCEPTION TRAMPOLINE -- copy the tramp to the
+	 * exception address. Define CONFIG_ROM_STUBS to prevent
+	 * the copy (e.g. exception in flash or in other
+	 * softare/firmware component).
+	 */
+#if !defined(CONFIG_ROM_STUBS)
+	movhi	r4, %hi(_except_start)
+	ori	r4, r4, %lo(_except_start)
+	movhi	r5, %hi(_except_end)
+	ori	r5, r5, %lo(_except_end)
+	movhi	r6, %hi(CONFIG_SYS_EXCEPTION_ADDR)
+	ori	r6, r6, %lo(CONFIG_SYS_EXCEPTION_ADDR)
+	beq	r4, r6, 7f	/* Skip if at proper addr */
+
+6:	ldwio	r7, 0(r4)
+	stwio	r7, 0(r6)
+	addi	r4, r4, 4
+	addi	r6, r6, 4
+	bne	r4, r5, 6b
+7:
+#endif
+
+	/* STACK INIT -- zero top two words for call back chain.
+	 */
+	movhi	sp, %hi(CONFIG_SYS_INIT_SP)
+	ori	sp, sp, %lo(CONFIG_SYS_INIT_SP)
+	addi	sp, sp, -8
+	stw	r0, 0(sp)
+	stw	r0, 4(sp)
+	mov	fp, sp
+
+	/*
+	 * Call board_init -- never returns
+	 */
+	movhi	r4, %hi(board_init@h)
+	ori	r4, r4, %lo(board_init@h)
+	callr	r4
+
+	/* NEVER RETURNS -- but branch to the _start just
+	 * in case ;-)
+	 */
+	br	_start
+
+
+/*
+ * dly_clks -- Nios2 (like Nios1) doesn't have a timebase in
+ * the core. For simple delay loops, we do our best by counting
+ * instruction cycles.
+ *
+ * Instruction performance varies based on the core. For cores
+ * with icache and static/dynamic branch prediction (II/f, II/s):
+ *
+ *	Normal ALU (e.g. add, cmp, etc):	1 cycle
+ *	Branch (correctly predicted, taken):	2 cycles
+ *	Negative offset is predicted (II/s).
+ *
+ * For cores without icache and no branch prediction (II/e):
+ *
+ *	Normal ALU (e.g. add, cmp, etc):	6 cycles
+ *	Branch (no prediction):			6 cycles
+ *
+ * For simplicity, if an instruction cache is implemented we
+ * assume II/f or II/s. Otherwise, we use the II/e.
+ *
+ */
+	.globl dly_clks
+
+dly_clks:
+
+#if (CONFIG_SYS_ICACHE_SIZE > 0)
+	subi	r4, r4, 3		/* 3 clocks/loop	*/
+#else
+	subi	r4, r4, 12		/* 12 clocks/loop	*/
+#endif
+	bge	r4, r0, dly_clks
+	ret
+
+
+#if !defined(CONFIG_IDENT_STRING)
+#define CONFIG_IDENT_STRING ""
+#endif
+	.data
+	.globl	version_string
+
+version_string:
+	.ascii U_BOOT_VERSION
+	.ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
+	.ascii CONFIG_IDENT_STRING, "\0"
diff --git a/arch/nios2/cpu/sysid.c b/arch/nios2/cpu/sysid.c
new file mode 100644
index 0000000..77bc8b5
--- /dev/null
+++ b/arch/nios2/cpu/sysid.c
@@ -0,0 +1,58 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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>
+
+#if defined (CONFIG_SYS_NIOS_SYSID_BASE)
+
+#include <command.h>
+#include <asm/io.h>
+#include <nios2-io.h>
+#include <linux/time.h>
+
+void display_sysid (void)
+{
+	struct nios_sysid_t *sysid = (struct nios_sysid_t *)CONFIG_SYS_NIOS_SYSID_BASE;
+	struct tm t;
+	char asc[32];
+	time_t stamp;
+
+	stamp = readl (&sysid->timestamp);
+	localtime_r (&stamp, &t);
+	asctime_r (&t, asc);
+	printf ("SYSID : %08lx, %s", readl (&sysid->id), asc);
+
+}
+
+int do_sysid (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	display_sysid ();
+	return (0);
+}
+
+U_BOOT_CMD(
+	sysid,	1,	1,	do_sysid,
+	"display Nios-II system id",
+	""
+);
+#endif /* CONFIG_SYS_NIOS_SYSID_BASE */
diff --git a/arch/nios2/cpu/traps.c b/arch/nios2/cpu/traps.c
new file mode 100644
index 0000000..3f1517d
--- /dev/null
+++ b/arch/nios2/cpu/traps.c
@@ -0,0 +1,42 @@
+/*
+ * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * 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 <asm/ptrace.h>
+#include <common.h>
+
+void trap_handler (struct pt_regs *regs)
+{
+	/* Just issue warning */
+	printf ("\n\n*** WARNING: unimplemented trap @ %08x\n\n",
+			regs->reg[29] - 4);
+}
+
+void soft_emulation (struct pt_regs *regs)
+{
+	/* TODO: Software emulation of mul/div etc. Until this is
+	 * implemented, generate warning and hang.
+	 */
+	printf ("\n\n*** ERROR: unimplemented instruction @ %08x\n",
+			regs->reg[29] - 4);
+	hang ();
+}