* Patch by Scott McNutt, 04 Oct 2003:

  - add support for Altera Nios-32 CPU
  - add support for Nios Cyclone Development Kit (DK-1C20)

* Patch by Steven Scholz, 29 Sep 2003:
  - A second parameter for bootm overwrites the load address for
    "Standalone Application" images.
  - bootm sets environment variable "filesize" to the resulting
    (uncompressed) data length for "Standalone Application" images
    when autostart is set to "no". Now you can do something like
       if bootm $fpgadata $some_free_ram ; then
               fpga load 0 $some_free_ram $filesize
       fi

* Patch by Denis Peter, 25 Sept 2003:
  add support for the MIP405 Rev. C board

CHANGELOG

@@ -2,6 +2,23 @@
 Changes for U-Boot 1.0.0:
 ======================================================================
 
+* Patch by Scott McNutt, 04 Oct 2003:
+  - add support for Altera Nios-32 CPU
+  - add support for Nios Cyclone Development Kit (DK-1C20)
+
+* Patch by Steven Scholz, 29 Sep 2003:
+  - A second parameter for bootm overwrites the load address for
+    "Standalone Application" images.
+  - bootm sets environment variable "filesize" to the resulting
+    (uncompressed) data length for "Standalone Application" images
+    when autostart is set to "no". Now you can do something like
+	if bootm $fpgadata $some_free_ram ; then
+		fpga load 0 $some_free_ram $filesize
+	fi
+
+* Patch by Denis Peter, 25 Sept 2003:
+  add support for the MIP405 Rev. C board
+
 * Patch by Yuli Barcohen, 25 Sep 2003:
   add support for Zephyr Engineering ZPC.1900 board
 
@@ -16,7 +33,6 @@ Changes for U-Boot 1.0.0:
   enable timed autoboot on PXA
 
 * Patch by David Müller, 22 Sep 2003:
-
   - add $(CFLAGS) to "-print-libgcc-filename" so compiler driver
     returns correct libgcc file path
   - "latency" reduction of busy-loop waiting to improve "U-Boot" boot

CREDITS

@@ -219,6 +219,10 @@ N: David M
 E: d.mueller@elsoft.ch
 D: Support for Samsung ARM920T SMDK2410 eval board
 
+N: Scott McNutt
+E: smcnutt@psyent.com
+D: Support for Altera Nios-32 CPU, for Nios Cyclone Development Kit (DK-1C20)
+
 N: Rolf Offermanns
 E: rof@sysgo.de
 D: Initial support for SSV-DNP1110, SMC91111 driver

MAINTAINERS

@@ -25,6 +25,10 @@ Pantelis Antoniou <panto@intracom.gr>
 
 	NETVIA			MPC8xx
 
+Yuli Barcohen <yuli@arabellasw.com>
+
+	ZPC1900			MPC8265
+
 Jerry Van Baren <gerald.vanbaren@smiths-aerospace.com>
 
 	sacsng			MPC8260
@@ -333,6 +337,17 @@ Wolfgang Denk <wd@denx.de>
 	incaip			MIPS32 4Kc
 	purple			MIPS64 5Kc
 
+#########################################################################
+# Nios-32 Systems:							#
+#									#
+# Maintainer Name, Email Address					#
+#	Board			CPU					#
+#########################################################################
+
+Scott McNutt <smcnutt@psyent.com>
+
+	DK1C20			Nios-32
+
 #########################################################################
 # End of MAINTAINERS list						#
 #########################################################################

Makefile

@@ -69,6 +69,9 @@ endif
 ifeq ($(ARCH),mips)
 CROSS_COMPILE = mips_4KC-
 endif
+ifeq ($(ARCH),nios)
+CROSS_COMPILE = nios-elf-
+endif
 endif
 endif
 
@@ -941,6 +944,17 @@ incaip_config: unconfig
 purple_config :		unconfig
 	@./mkconfig $(@:_config=) mips mips purple
 
+#========================================================================
+# Nios
+#========================================================================
+#########################################################################
+## Nios32
+#########################################################################
+
+DK1C20_config:	unconfig
+	@./mkconfig $(@:_config=) nios nios dk1c20
+
+
 #########################################################################
 #########################################################################
 

board/dk1c20/Makefile

@@ -0,0 +1,48 @@
+#
+# (C) Copyright 2001
+# 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 $(TOPDIR)/config.mk
+
+LIB	= lib$(BOARD).a
+
+OBJS	:= $(BOARD).o flash.o
+
+SOBJS  = vectors.o
+
+$(LIB):	$(OBJS) $(SOBJS)
+	$(AR) crv $@ $^
+
+clean:
+	rm -f $(SOBJS) $(OBJS)
+
+distclean:	clean
+	rm -f $(LIB) core *.bak .depend
+
+#########################################################################
+
+.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
+		$(CC) -M $(CPPFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+
+-include .depend
+
+#########################################################################

board/dk1c20/config.mk

@@ -0,0 +1,30 @@
+#
+# (C) Copyright 2003
+# Psyent Corporation
+# 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
+#
+
+TEXT_BASE = 0x018c0000
+
+ifeq ($(debug),1)
+PLATFORM_CPPFLAGS += -DDEBUG
+endif
+

board/dk1c20/dk1c20.c

@@ -0,0 +1,45 @@
+/*
+ * (C) Copyright 2003, 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>
+
+void _default_hdlr (void)
+{
+	printf ("default_hdlr\n");
+}
+
+int board_pre_init (void)
+{
+	return 0;
+}
+
+int checkboard (void)
+{
+	puts ("Board: Altera Nios 1C20 Development Kit\n");
+	return 0;
+}
+
+long int initdram (int board_type)
+{
+	return (0);
+}

board/dk1c20/flash.c

@@ -0,0 +1,226 @@
+/*
+ * (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
+ */
+
+
+#include <common.h>
+#include <nios.h>
+
+/*---------------------------------------------------------------------*/
+#define BANKSZ	(8 * 1024 * 1024)
+#define SECTSZ	(64 * 1024)
+#define USERFLASH (2 * 1024 * 1024)	/* bottom 2 MB for user */
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
+
+#define FLASH_WORD_SIZE unsigned char
+
+/*---------------------------------------------------------------------*/
+
+unsigned long flash_init (void)
+{
+	int i;
+	unsigned long addr;
+	flash_info_t *fli = &flash_info[0];
+
+	fli->size = BANKSZ;
+	fli->sector_count = CFG_MAX_FLASH_SECT;
+	fli->flash_id = FLASH_MAN_AMD;
+
+	addr = CFG_FLASH_BASE;
+	for (i = 0; i < fli->sector_count; ++i) {
+		fli->start[i] = addr;
+		addr += SECTSZ;
+
+		/* Protect all but 2 MByte user area */
+		if (addr < (CFG_FLASH_BASE + USERFLASH))
+			fli->protect[i] = 0;
+		else
+			fli->protect[i] = 1;
+	}
+
+	return (BANKSZ);
+}
+
+/*--------------------------------------------------------------------*/
+void flash_print_info (flash_info_t * info)
+{
+	int i, k;
+	unsigned long size;
+	int erased;
+	volatile unsigned char *flash;
+
+	printf ("  Size: %ld KB in %d Sectors\n",
+		info->size >> 10, info->sector_count);
+	printf ("  Sector Start Addresses:");
+	for (i = 0; i < info->sector_count; ++i) {
+
+		/* Check if whole sector is erased */
+		if (i != (info->sector_count - 1))
+			size = info->start[i + 1] - info->start[i];
+		else
+			size = info->start[0] + info->size - info->start[i];
+		erased = 1;
+		flash = (volatile unsigned char *) info->start[i];
+		for (k = 0; k < size; k++) {
+			if (*flash++ != 0xff) {
+				erased = 0;
+				break;
+			}
+		}
+
+		/* Print the info */
+		if ((i % 5) == 0)
+			printf ("\n   ");
+		printf (" %08lX%s%s", info->start[i], erased ? " E" : "  ",
+			info->protect[i] ? "RO " : "   ");
+	}
+	printf ("\n");
+}
+
+/*-------------------------------------------------------------------*/
+
+
+int flash_erase (flash_info_t * info, int s_first, int s_last)
+{
+	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]);
+	volatile FLASH_WORD_SIZE *addr2;
+	int prot, sect;
+	int any = 0;
+	unsigned oldpri;
+	ulong start;
+
+	/* Some sanity checking */
+	if ((s_first < 0) || (s_first > s_last)) {
+		printf ("- no sectors to erase\n");
+		return 1;
+	}
+
+	prot = 0;
+	for (sect = s_first; sect <= s_last; ++sect) {
+		if (info->protect[sect]) {
+			prot++;
+		}
+	}
+	if (prot) {
+		printf ("- Warning: %d protected sectors will not be erased!\n",
+			prot);
+	} else {
+		printf ("\n");
+	}
+
+	/* NOTE: disabling interrupts on Nios can be very bad since it
+	 * also disables the LO_LIMIT exception. It's better here to
+	 * set the interrupt priority to 3 & restore it when we're done.
+	 */
+	oldpri = ipri (3);
+
+	/* It's ok to erase multiple sectors provided we don't delay more
+	 * than 50 usec between cmds ... at which point the erase time-out
+	 * occurs. So don't go and put printf() calls in the loop ... it
+	 * won't be very helpful ;-)
+	 */
+	for (sect = s_first; sect <= s_last; sect++) {
+		if (info->protect[sect] == 0) {	/* not protected */
+			addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
+			*addr = 0xaa;
+			*addr = 0x55;
+			*addr = 0x80;
+			*addr = 0xaa;
+			*addr = 0x55;
+			*addr2 = 0x30;
+			any = 1;
+		}
+	}
+
+	/* Now just wait for 0xff & provide some user feedback while
+	 * we wait.
+	 */
+	if (any) {
+		addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
+		start = get_timer (0);
+		while (*addr2 != 0xff) {
+			udelay (1000 * 1000);
+			putc ('.');
+			if (get_timer (start) > CFG_FLASH_ERASE_TOUT) {
+				printf ("timeout\n");
+				return 1;
+			}
+		}
+		printf ("\n");
+	}
+
+	/* Restore interrupt priority */
+	ipri (oldpri);
+
+	return 0;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+
+int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
+{
+
+	vu_char *cmd = (vu_char *) info->start[0];
+	vu_char *dst = (vu_char *) addr;
+	unsigned char b;
+	unsigned oldpri;
+	ulong start;
+
+	while (cnt) {
+		/* Check for sufficient erase */
+		b = *src;
+		if ((*dst & b) != b) {
+			printf ("%02x : %02x\n", *dst, b);
+			return (2);
+		}
+
+		/* Disable interrupts other than window underflow
+		 * (interrupt priority 2)
+		 */
+		oldpri = ipri (3);
+		*cmd = 0xaa;
+		*cmd = 0x55;
+		*cmd = 0xa0;
+		*dst = b;
+
+		/* Verify write */
+		start = get_timer (0);
+		while (*dst != b) {
+			if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
+				ipri (oldpri);
+				return 1;
+			}
+		}
+		dst++;
+		src++;
+		cnt--;
+		ipri (oldpri);
+	}
+
+	return (0);
+}

board/dk1c20/u-boot.lds

@@ -0,0 +1,70 @@
+/*
+ * (C) Copyright 2003, 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
+ */
+
+
+OUTPUT_FORMAT("elf32-nios")
+OUTPUT_ARCH(nios)
+ENTRY(_start)
+
+SECTIONS
+{
+	.text :
+	{
+	  cpu/nios/start.o (.text)
+	  *(.text)
+	}
+        __text_end = .;
+
+        . = ALIGN(4);
+        .rodata :
+	{
+		*(.rodata)
+	}
+	__rodata_end = .;
+
+        . = ALIGN(4);
+        .data :
+	{
+		*(.data)
+	}
+	. = ALIGN(4);
+	__data_end = .;
+
+	__u_boot_cmd_start = .;
+	.u_boot_cmd :
+	{
+		*(.u_boot_cmd)
+	}
+	. = ALIGN(4);
+	__u_boot_cmd_end = .;
+
+	__bss_start = .;
+        . = ALIGN(4);
+        .bss :
+	{
+		*(.bss)
+	}
+	. = ALIGN(4);
+	__bss_end = .;
+}
+

board/dk1c20/vectors.S

@@ -0,0 +1,124 @@
+/*
+ * (C) Copyright 2003, 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
+ */
+
+
+/*************************************************************************
+ * Exception Vector Table
+ *
+ * This could have gone in the cpu soure tree, but the whole point of
+ * Nios is customization -- and polluting the cpu source tree with
+ * board-specific ifdef's really defeats the purpose, no? With this in
+ * the board-specific tree, each board has the freedom to organize
+ * vectors/traps, etc anyway it wants. The init code copies this table
+ * to the proper location.
+ *
+ * Each board can do what it likes here. But there are four "standard"
+ * handlers availble:
+ *
+ *	_cwp_lolimit	-Handles register window underflows.
+ *	_cwp_hilimit	-Handles register window overflows.
+ *	_timebase_int	-Increments the timebase.
+ *	_def_xhandler	-Default exception handler.
+ *
+ * _timebase_int handles a Nios Timer interrupt and increments the
+ * timestamp used for the get_timer(), reset_timer(), etc. routines. It
+ * expects the timer to be configured like the standard-32 low priority
+ * timer.
+ *
+ * _def_xhandler dispatches exceptions/traps via the external_interrupt()
+ * routine. This lets you use the irq_install_handler() and handle your
+ * interrupts/traps with code written in C.
+ ************************************************************************/
+
+	.data
+	.global _vectors
+	.align	4
+_vectors:
+
+	.long	_def_xhandler@h		/* Vector 0  - NMI */
+	.long	_cwp_lolimit@h		/* Vector 1  -  underflow */
+	.long	_cwp_hilimit@h		/* Vector 2  - overflow	*/
+
+	.long	_def_xhandler@h		/* Vector 3 - GNUPro debug */
+	.long	_def_xhandler@h		/* Vector 4 - GNUPro debug */
+	.long	_def_xhandler@h		/* Vector 5 - GNUPro debug */
+	.long	_def_xhandler@h		/* Vector 6 - future reserved */
+	.long	_def_xhandler@h		/* Vector 7 - future reserved */
+	.long	_def_xhandler@h		/* Vector 8 - future reserved */
+	.long	_def_xhandler@h		/* Vector 9 - future reserved */
+	.long	_def_xhandler@h		/* Vector 10 - future reserved */
+	.long	_def_xhandler@h		/* Vector 11 - future reserved */
+	.long	_def_xhandler@h		/* Vector 12 - future reserved */
+	.long	_def_xhandler@h		/* Vector 13 - future reserved */
+	.long	_def_xhandler@h		/* Vector 14 - future reserved */
+	.long	_def_xhandler@h		/* Vector 15 - future reserved */
+	.long	_def_xhandler@h		/* Vector 16 */
+	.long	_def_xhandler@h		/* Vector 17 */
+	.long	_def_xhandler@h		/* Vector 18 */
+	.long	_def_xhandler@h		/* Vector 19 */
+	.long	_def_xhandler@h		/* Vector 20 */
+	.long	_def_xhandler@h		/* Vector 21 */
+	.long	_def_xhandler@h		/* Vector 22 */
+	.long	_def_xhandler@h		/* Vector 23 */
+	.long	_def_xhandler@h		/* Vector 24 */
+	.long	_def_xhandler@h		/* Vector 25 */
+	.long	_def_xhandler@h		/* Vector 26 */
+	.long	_def_xhandler@h		/* Vector 27 */
+	.long	_def_xhandler@h		/* Vector 28 */
+	.long	_def_xhandler@h		/* Vector 29 */
+	.long	_def_xhandler@h		/* Vector 30 */
+	.long	_def_xhandler@h		/* Vector 31 */
+	.long	_def_xhandler@h		/* Vector 32 */
+	.long	_def_xhandler@h		/* Vector 33 */
+	.long	_def_xhandler@h		/* Vector 34 */
+	.long	_def_xhandler@h		/* Vector 35 */
+	.long	_def_xhandler@h		/* Vector 36 */
+	.long	_def_xhandler@h		/* Vector 37 */
+	.long	_def_xhandler@h		/* Vector 38 */
+	.long	_def_xhandler@h		/* Vector 39 */
+	.long	_def_xhandler@h		/* Vector 40 */
+	.long	_def_xhandler@h		/* Vector 41 */
+	.long	_def_xhandler@h		/* Vector 42 */
+	.long	_def_xhandler@h		/* Vector 43 */
+	.long	_def_xhandler@h		/* Vector 44 */
+	.long	_def_xhandler@h		/* Vector 45 */
+	.long	_def_xhandler@h		/* Vector 46 */
+	.long	_def_xhandler@h		/* Vector 47 */
+	.long	_def_xhandler@h		/* Vector 48 */
+	.long	_def_xhandler@h		/* Vector 49 */
+	.long	_timebase_int@h		/* Vector 50 - lopri timer*/
+	.long	_def_xhandler@h		/* Vector 51 */
+	.long	_def_xhandler@h		/* Vector 52 */
+	.long	_def_xhandler@h		/* Vector 53 */
+	.long	_def_xhandler@h		/* Vector 54 */
+	.long	_def_xhandler@h		/* Vector 55 */
+	.long	_def_xhandler@h		/* Vector 56 */
+	.long	_def_xhandler@h		/* Vector 57 */
+	.long	_def_xhandler@h		/* Vector 58 */
+	.long	_def_xhandler@h		/* Vector 59 */
+	.long	_def_xhandler@h		/* Vector 60 */
+	.long	_def_xhandler@h		/* Vector 61 */
+	.long	_def_xhandler@h		/* Vector 62 */
+	.long	_def_xhandler@h		/* Vector 63 */
+
+

board/mpl/common/flash.c

@@ -155,7 +155,7 @@ void setup_cs_reloc(void)
 
 unsigned long flash_init (void)
 {
-	unsigned long size_b0, size_b1,flashcr;
+	unsigned long size_b0, size_b1,flashcr, size_reg;
 	int mode, i;
 	extern char version_string;
 	char *p=&version_string;
@@ -196,6 +196,21 @@ unsigned long flash_init (void)
 	size_b1 = 0 ;
 	flash_info[0].size = size_b0;
 	/* set up flash cs according to the size */
+	size_reg=(flash_info[0].size >>20);
+	switch (size_reg) {
+		case 0:
+		case 1: i=0; break; /* <= 1MB */
+		case 2: i=1; break; /* = 2MB */
+		case 4: i=2; break; /* = 4MB */
+		case 8: i=3; break; /* = 8MB */
+		case 16: i=4; break; /* = 16MB */
+		case 32: i=5; break; /* = 32MB */
+		case 64: i=6; break; /* = 64MB */
+		case 128: i=7; break; /*= 128MB */
+		default: 
+			printf("\n #### ERROR, wrong size %ld MByte reset board #####\n",size_reg);
+			while(1);
+	}
 	if(mode & BOOT_MPS) {
 		/* flash is on CS1 */
 		mtdcr(ebccfga, pb1cr);
@@ -203,7 +218,7 @@ unsigned long flash_init (void)
 		/* we map the flash high in every case */
 		flashcr&=0x0001FFFF; /* mask out address bits */
 		flashcr|= ((0-flash_info[0].size) & 0xFFF00000); /* start addr */
-		flashcr|= (((flash_info[0].size >>21) & 0x07) << 17); /* size addr */
+		flashcr|= (i << 17); /* size addr */
 		mtdcr(ebccfga, pb1cr);
 		mtdcr(ebccfgd, flashcr);
 	}
@@ -214,7 +229,7 @@ unsigned long flash_init (void)
 		/* we map the flash high in every case */
 		flashcr&=0x0001FFFF; /* mask out address bits */
 		flashcr|= ((0-flash_info[0].size) & 0xFFF00000); /* start addr */
-		flashcr|= (((flash_info[0].size >>21) & 0x07) << 17); /* size addr */
+		flashcr|= (i << 17); /* size addr */
 		mtdcr(ebccfga, pb0cr);
 		mtdcr(ebccfgd, flashcr);
 	}

board/mpl/mip405/mip405.c

@@ -167,6 +167,15 @@ const sdram_t sdram_table[] = {
 		3,	/* Address Mode = 3 */
 		5,	/* size value */
 		1},	/* ECC enabled */
+	{ 0x2f,	/* Rev C, 128MByte -3 Board */
+		3,	/* Case Latenty = 3 */
+		3,	/* trp 20ns / 7.5 ns datain[27] */
+		3,	/* trcd 20ns /7.5 ns (datain[29]) */
+		6,	/* tras 44ns /7.5 ns  (datain[30]) */
+		4,	/* tcpt 44 - 20ns = 24ns */
+		3,	/* Address Mode = 3 */
+		5,	/* size value */
+		1},	/* ECC enabled */
 	{ 0xff, /* terminator */
 	  0xff,
 	  0xff,
@@ -550,7 +559,8 @@ void get_pcbrev_var(unsigned char *pcbrev, unsigned char *var)
 		tmp >>= 1;
 	}
 	rc++;
-	if((((bc>>4) & 0xf)==0x1) /* Rev B PCB with */
+	if((  (((bc>>4) & 0xf)==0x2) /* Rev C PCB or */
+	   || (((bc>>4) & 0xf)==0x1)) /* Rev B PCB with */
 		&& (rc==0x1))     /* Population Option 1 is a -3 */
 		rc=3;
 	*pcbrev=(bc >> 4) & 0xf;

common/cmd_bdinfo.c

@@ -95,6 +95,33 @@ int do_bdinfo ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return 0;
 }
 
+#elif defined(CONFIG_NIOS) /* NIOS*/
+
+int do_bdinfo ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	int i;
+	bd_t *bd = gd->bd;
+
+	print_num ("memstart",		(ulong)bd->bi_memstart);
+	print_num ("memsize",		(ulong)bd->bi_memsize);
+	print_num ("flashstart",	(ulong)bd->bi_flashstart);
+	print_num ("flashsize",		(ulong)bd->bi_flashsize);
+	print_num ("flashoffset",	(ulong)bd->bi_flashoffset);
+
+	printf ("ethaddr     =");
+	for (i=0; i<6; ++i) {
+		printf ("%c%02X", i ? ':' : ' ', bd->bi_enetaddr[i]);
+	}
+	printf ("\nip_addr     = ");
+	print_IPaddr (bd->bi_ip_addr);
+	printf ("\nbaudrate    = %ld bps\n", bd->bi_baudrate);
+
+	return 0;
+}
+
+
 #else /* ! PPC, which leaves MIPS */
 
 int do_bdinfo ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])

common/cmd_boot.c

@@ -59,7 +59,14 @@ int do_go (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	 */
 	argv[0] = (char *)gd;
 #endif
+#if !defined(CONFIG_NIOS)
 	rc = ((ulong (*)(int, char *[]))addr) (--argc, &argv[1]);
+#else
+	/*
+	 * Nios function pointers are address >> 1
+	 */
+	rc = ((ulong (*)(int, char *[]))(addr>>1)) (--argc, &argv[1]);
+#endif
 	if (rc != 0) rcode = 1;
 
 	printf ("## Application terminated, rc = 0x%lX\n", rc);

common/cmd_bootm.c

@@ -235,6 +235,8 @@ int do_bootm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	if (hdr->ih_arch != IH_CPU_I386)
 #elif defined(__mips__)
 	if (hdr->ih_arch != IH_CPU_MIPS)
+#elif defined(__nios__)
+	if (hdr->ih_arch != IH_CPU_NIOS)
 #else
 # error Unknown CPU type
 #endif
@@ -247,6 +249,10 @@ int do_bootm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 
 	switch (hdr->ih_type) {
 	case IH_TYPE_STANDALONE:	name = "Standalone Application";
+					/* A second argument overwrites the load address */
+					if (argc > 2) {
+						hdr->ih_load = simple_strtoul(argv[2], NULL, 16);
+					}
 					break;
 	case IH_TYPE_KERNEL:		name = "Kernel Image";
 					break;
@@ -347,8 +353,12 @@ int do_bootm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 		/* load (and uncompress), but don't start if "autostart"
 		 * is set to "no"
 		 */
-		if (((s = getenv("autostart")) != NULL) && (strcmp(s,"no") == 0))
+		if (((s = getenv("autostart")) != NULL) && (strcmp(s,"no") == 0)) {
+			char buf[32];
+			sprintf(buf, "%lX", len);
+			setenv("filesize", buf);
 			return 0;
+		}
 		appl = (int (*)(cmd_tbl_t *, int, int, char *[]))ntohl(hdr->ih_ep);
 		(*appl)(cmdtp, flag, argc-1, &argv[1]);
 		return 0;

cpu/nios/Makefile

@@ -0,0 +1,44 @@
+#
+# (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
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= lib$(CPU).a
+
+START	= start.o
+AOBJS	= traps.o
+OBJS	= cpu.o interrupts.o serial.o
+
+all:	.depend $(START) $(LIB)
+
+$(LIB):	$(OBJS) $(AOBJS)
+	$(AR) crv $@ $(OBJS) $(AOBJS)
+
+#########################################################################
+
+.depend: Makefile $(START:.o=.S) $(OBJS:.o=.c) $(AOBJS:.o=.S)
+	$(CC) -M $(CFLAGS) $(START:.o=.S) $(OBJS:.o=.c) $(AOBJS:.o=.S) > $@
+
+sinclude .depend
+
+#########################################################################

cpu/nios/config.mk

@@ -0,0 +1,25 @@
+#
+# (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 +=
+

cpu/nios/cpu.c

@@ -0,0 +1,78 @@
+/*
+ * (C) Copyright 2003, 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 <nios.h>
+
+
+int checkcpu (void)
+{
+	unsigned val;
+	unsigned rev_major;
+	unsigned rev_minor;
+	short nregs, hi_limit, lo_limit;
+
+	/* Get cpu version info */
+	val = rdctl (CTL_CPU_ID);
+	printf ("CPU: ");
+	printf ("%s", (val & 0x00008000) ? "Nios-16 " : "Nios-32 ");
+	rev_major = (val>>12) & 0x07;
+	rev_minor = val & 0x0f;
+	printf ("Rev. %d.%02d (0x%04x)", rev_major, rev_minor,
+			val & 0xffff);
+	if (rev_major == 0x08)
+		printf (" [OpenCore (R) Plus]");
+	printf ("\n");
+
+	/* Check register file */
+	val = rdctl (CTL_WVALID);
+	lo_limit = val & 0x01f;
+	hi_limit = (val>>5) & 0x1f;
+	nregs = (hi_limit + 2) * 16;
+	printf ("Reg file size: %d LO_LIMIT/HI_LIMIT: %d/%d\n",
+		nregs, lo_limit, hi_limit);
+
+	return (0);
+}
+
+
+int do_reset (void)
+{
+	/* trap 0 does the trick ... at least with the OCI debug
+	 * present -- haven't tested without it yet (stm).
+	 */
+	disable_interrupts ();
+	ipri (1);
+	asm volatile ("trap 0\n");
+
+	/* No return ;-) */
+
+	return(0);
+}
+
+
+#if defined(CONFIG_WATCHDOG)
+void watchdog_reset (void)
+{
+}
+#endif /* CONFIG_WATCHDOG */

cpu/nios/interrupts.c

@@ -0,0 +1,184 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2003, 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 <nios.h>
+#include <nios-io.h>
+#include <asm/ptrace.h>
+#include <common.h>
+#include <command.h>
+
+/****************************************************************************/
+
+struct	irq_action {
+	interrupt_handler_t *handler;
+	void *arg;
+	int count;
+};
+
+static struct irq_action irq_vecs[64];
+
+/*************************************************************************/
+volatile ulong timestamp = 0;
+
+void reset_timer (void)
+{
+	timestamp = 0;
+}
+
+ulong get_timer (ulong base)
+{
+	return (timestamp - base);
+}
+
+void set_timer (ulong t)
+{
+	timestamp = t;
+}
+
+
+/* The board must handle this interrupt if a timer is not
+ * provided.
+ */
+#if defined(CFG_NIOS_TMRBASE)
+void timer_interrupt (struct pt_regs *regs)
+{
+	/* Interrupt is cleared by writing anything to the
+	 * status register.
+	 */
+	nios_timer_t *tmr = (nios_timer_t *)CFG_NIOS_TMRBASE;
+	tmr->status = 0;
+	timestamp += CFG_NIOS_TMRMS;
+}
+#endif
+
+/*************************************************************************/
+int disable_interrupts (void)
+{
+	int val = 0;
+
+	/* Writing anything to CLR_IE disables interrupts */
+	val = rdctl (CTL_STATUS);
+	wrctl (CTL_CLR_IE, 0);
+	return (val & STATUS_IE);
+}
+
+void enable_interrupts( void )
+{
+	/* Writing anything SET_IE enables interrupts */
+	wrctl (CTL_SET_IE, 0);
+}
+
+void external_interrupt (struct pt_regs *regs)
+{
+	unsigned vec;
+
+	vec = (regs->status & STATUS_IPRI) >> 9;	/* ipri */
+
+	irq_vecs[vec].count++;
+	if (irq_vecs[vec].handler != NULL) {
+		(*irq_vecs[vec].handler)(irq_vecs[vec].arg);
+	} else {
+		/* A sad side-effect of masking a bogus interrupt is
+		 * that lower priority interrupts will also be disabled.
+		 * This is probably not what we want ... so hang insted.
+		 */
+		printf ("Unhandled interrupt: 0x%x\n", vec);
+		disable_interrupts ();
+		hang ();
+	}
+}
+
+/*************************************************************************/
+int interrupt_init (void)
+{
+	int vec;
+
+#if defined(CFG_NIOS_TMRBASE)
+	nios_timer_t *tmr = (nios_timer_t *)CFG_NIOS_TMRBASE;
+
+	tmr->control &= ~NIOS_TIMER_ITO;
+	tmr->control |= NIOS_TIMER_STOP;
+#endif
+
+	for (vec=0; vec<64; vec++ ) {
+		irq_vecs[vec].handler = NULL;
+		irq_vecs[vec].arg = NULL;
+		irq_vecs[vec].count = 0;
+	}
+
+	/* Need timus interruptus -- start the lopri timer */
+#if defined(CFG_NIOS_TMRBASE)
+	tmr->control |= ( NIOS_TIMER_ITO |
+			  NIOS_TIMER_CONT |
+			  NIOS_TIMER_START );
+	ipri (CFG_NIOS_TMRIRQ + 1);
+#endif
+	enable_interrupts ();
+	return (0);
+}
+
+void irq_install_handler (int vec, interrupt_handler_t *handler, void *arg)
+{
+	struct irq_action *irqa = irq_vecs;
+	int   i = vec;
+	int flag;
+
+	if (irqa[i].handler != NULL) {
+		printf ("Interrupt vector %d: handler 0x%x "
+			"replacing 0x%x\n",
+			vec, (uint)handler, (uint)irqa[i].handler);
+	}
+
+	flag = disable_interrupts ();
+	irqa[i].handler = handler;
+	irqa[i].arg = arg;
+	if (flag )
+		enable_interrupts ();
+}
+
+/*************************************************************************/
+#if (CONFIG_COMMANDS & CFG_CMD_IRQ)
+int do_irqinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	int vec;
+
+	printf ("\nInterrupt-Information:\n");
+	printf ("Nr  Routine   Arg       CouIt's ok to cnt\n");
+
+	for (vec=0; vec<64; vec++) {
+		if (irq_vecs[vec].handler != NULL) {
+			printf ("%02d  %08lx  %08lx  %d\n",
+				vec,
+				(ulong)irq_vecs[vec].handler<<1,
+				(ulong)irq_vecs[vec].arg,
+				irq_vecs[vec].count);
+		}
+	}
+
+	return (0);
+}
+#endif  /* CONFIG_COMMANDS & CFG_CMD_IRQ */

cpu/nios/serial.c

@@ -0,0 +1,86 @@
+/*
+ * (C) Copyright 2003, 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 <nios-io.h>
+
+
+static nios_uart_t *uart = (nios_uart_t *)CFG_NIOS_CONSOLE;
+
+#if defined(CFG_NIOS_FIXEDBAUD)
+
+/* Everything's already setup for fixed-baud PTF
+ * assignment
+ */
+void serial_setbrg( void ){ return; }
+int serial_init( void ) { return(0);}
+
+#else
+
+void serial_setbrg( void )
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	unsigned div;
+
+	div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1;
+	uart->divisor = div;
+	return;
+}
+
+int serial_init( void )
+{
+	serial_setbrg();
+	return(0);
+}
+
+#endif /* CFG_NIOS_FIXEDBAUD */
+
+
+void serial_putc( char c )
+{
+	if (c == '\n')
+		serial_putc('\r');
+	while( (uart->status & NIOS_UART_TRDY) == 0 )
+		;
+	uart->txdata = (unsigned char)c;
+}
+
+void serial_puts( const char *s )
+{
+	while( *s != 0 ) {
+		serial_putc( *s++ );
+	}
+}
+
+int serial_tstc( void )
+{
+	return( uart->status & NIOS_UART_RRDY);
+}
+
+int serial_getc( void )
+{
+	while( serial_tstc() == 0 )
+		;
+	return( uart->rxdata & 0x00ff );
+}

cpu/nios/start.S

@@ -0,0 +1,186 @@
+/*
+ * (C) Copyright 2003, 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 <version.h>
+
+#if !defined(CONFIG_IDENT_STRING)
+#define CONFIG_IDENT_STRING ""
+#endif
+
+#define STATUS_INIT	0x8600		/* IE=1, IPRI=2 */
+
+/*************************************************************************
+ * RESTART
+ ************************************************************************/
+
+	.text
+	.global _start
+
+_start:
+	bsr	0f
+	nop
+	.long	_start
+
+	/* GERMS -- The "standard-32" configuration GERMS monitor looks
+	 * for the string "Nios" at flash_base + 0xc (actually it only
+	 * tests for 'N', 'i'). You can leave support for this in place
+	 * as it's only a few words.
+	 */
+	. = _start + 0x000c
+	.string "Nios"
+
+	.align 4
+0:
+	/*
+	 * Early setup -- set cwp = HI_LIMIT, IPRI = 2, IE = 1 to
+	 * enable underflow exceptions. Disable cache.
+	 * NOTE: %o7 has return addr -- save in %g7 use later.
+	 */
+	mov	%g7, %o7
+
+	pfx	2			/* WVALID */
+	rdctl	%g0
+	lsri	%g0, 1
+	pfx	%hi(STATUS_INIT)
+	or	%g0, %lo(STATUS_INIT)
+	wrctl	%g0			/* update status */
+	nop
+
+	/*
+	 * STACK
+	 */
+	pfx	%hi(CFG_INIT_SP)
+	movi	%sp, %lo(CFG_INIT_SP)
+	pfx	%xhi(CFG_INIT_SP)
+	movhi	%sp, %xlo(CFG_INIT_SP)
+	mov	%fp, %sp
+
+	pfx	%hi(4*16)
+	subi	%sp, %lo(4*16)		/* Space for reg window mgmt */
+
+	/*
+	 * RELOCATE -- %g7 has return addr from bsr at _start.
+	 */
+	pfx	%hi(__u_boot_cmd_end)
+	movi	%g5, %lo(__u_boot_cmd_end)
+	pfx	%xhi(__u_boot_cmd_end)
+	movhi	%g5, %xlo(__u_boot_cmd_end) /* %g5 <- end address */
+
+	lsli	%g7, 1			/* mem = retaddr << 1 */
+	mov	%g6, %g7
+	subi	%g6, 4			/* %g6 <- src addr */
+	ld	%g7, [%g7]		/* %g7 <- dst addr */
+
+1:	cmp	%g7, %g5
+	skps	cc_nz
+	br	2f
+	nop				/* delay slot */
+
+	ld	%g0, [%g6]
+	addi	%g6, 4			/* src++ */
+	st	[%g7], %g0
+	addi	%g7, 4			/* dst++ */
+	br	1b
+	nop				/* delay slot */
+2:
+
+	/*
+	 * Jump to relocation address
+	 */
+	 pfx	%hi(reloc@h)
+	 movi	%g0, %lo(reloc@h)
+	 pfx	%xhi(reloc@h)
+	 movhi	%g0, %xlo(reloc@h)
+	 jmp	%g0
+reloc:
+
+	/*
+	 * CLEAR BSS
+	 */
+	pfx	%hi(__bss_end)
+	movi	%g5, %lo(__bss_end)
+	pfx	%xhi(__bss_end)
+	movhi	%g5, %xlo(__bss_end)	/* %g5 <- end address */
+	pfx	%hi(__bss_start)
+	movi	%g7, %lo(__bss_start)
+	pfx	%xhi(__bss_start)
+	movhi	%g7, %xlo(__bss_start)	/* %g7 <- end address */
+
+	movi	%g0, 0
+3:	cmp	%g7, %g5
+	skps	cc_nz
+	br	4f
+	nop				/* delay slot */
+
+	st	[%g7], %g0
+	addi	%g7, 4			/* (delay slot) dst++ */
+	br	3b
+	nop				/* delay slot */
+4:
+
+	/*
+	 * Call board_init -- never returns
+	 */
+	pfx	%hi(board_init@h)
+	movi	%g1, %lo(board_init@h)
+	pfx	%xhi(board_init@h)
+	movhi	%g1, %xlo(board_init@h)
+	call	%g1
+	nop				/* Delaly slot */
+	/* NEVER RETURNS */
+
+/*
+ * dly_clks -- Nios doesn't have a time/clk reference for simple
+ * delay loops, so we do our best by counting instruction cycles.
+ * A control register that counts system clock cycles would be
+ * a handy feature -- hint for Altera ;-)
+ */
+ 	.globl dly_clks
+	/* Each loop is 4 instructions as delay slot is always
+	 * executed. Each instruction is approximately 4 clocks
+	 * (according to some lame info from Altera). So ...
+	 * ... each loop is about 16 clocks.
+	 */
+
+dly_clks:
+	lsri	%o0, 4			/* cnt/16 */
+
+8:	skprnz	%o0
+	br	9f
+	subi	%o0, 1			/* cnt--, Delay slot */
+	br	8b
+	nop
+
+9:	lret
+	nop				/* Delay slot */
+
+
+	.data
+	.globl	version_string
+
+version_string:
+	.ascii U_BOOT_VERSION
+	.ascii " (", __DATE__, " - ", __TIME__, ")"
+	.ascii CONFIG_IDENT_STRING, "\0"

cpu/nios/traps.S

@@ -0,0 +1,559 @@
+/*
+ * (C) Copyright 2003, 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>
+
+/*************************************************************************
+ * Register window underflow
+ *
+ * The register window underflow exception occurs whenever the lowest
+ * valid register window is in use (CWP=LO_LIMIT) and a save instruction
+ * is issued. The save moves CWP below LO_LIMIT, %sp is set as normal,
+ * then the exception is generated prior to executing the instruction
+ * after the save.
+ ************************************************************************/
+	.text
+	.global _cwp_lolimit
+	.align	4
+
+_cwp_lolimit:
+
+	/* Sixteen words are always allocated by the compiler in every
+	 * procedure's stack frame, always starting at %sp, for saving
+	 * 'in' and 'local' registers on a window overflow.
+	 *
+	 * Save the 'global' and 'in' regs on stack. They are restored
+	 * at cwp = HI_LIMIT. The 'local' regs aren't in-use at this point.
+	 */
+	sts	[%sp,0], %g0		/* Save 'global' regs*/
+	sts	[%sp,1], %g1
+	sts	[%sp,2], %g2
+	sts	[%sp,3], %g3
+	sts	[%sp,4], %g4
+	sts	[%sp,5], %g5
+	sts	[%sp,6], %g6
+	sts	[%sp,7], %g7
+
+	sts	[%sp,8], %i0		/* Save 'in' regs */
+	sts	[%sp,9], %i1
+	sts	[%sp,10], %i2
+	sts	[%sp,11], %i3
+	sts	[%sp,12], %i4
+	sts	[%sp,13], %i5
+	sts	[%sp,14], %i6
+	sts	[%sp,15], %i7
+
+	/* Save current %sp and return address in a global so they are
+	 * available at cwp = HI_LIMIT ... where the 'global'/'in' regs
+	 * are restored. NOTE: %sp changes with cwp.
+	 */
+	mov	%g7, %o7
+	mov	%g6, %sp
+
+	/* Get LO_LIMIT/HI_LIMIT to know where to start & stop. Note: in
+	 * the underflow exception, cwp is __NOT__ guaranteed to be zero.
+	 * If the OCI debug module is enabled the reset value for LO_LIMIT
+	 * is 2, not 1 -- so cwp can be 1 or 0.
+	 */
+	pfx	2			/* WVALID */
+	rdctl	%g1
+	mov	%g2, %g1
+	pfx	0
+	and	%g1, 0x1f		/* g1 <- LO_LIMIT */
+	lsri	%g2, 5
+	pfx	0
+	and	%g2,0x1f		/* g2 <- HI_LIMIT */
+
+	/* Set istatus so cwp = HI_LIMIT after tret
+	 */
+	movi	%g5, 0x1f
+	lsli	%g5, 4
+	not	%g5			/* mask to clr cwp */
+	pfx	1			/* istatus */
+	rdctl	%g0
+	and	%g0, %g5		/* clear cwp field */
+
+	mov	%g4, %g2
+	lsli	%g4, 4
+	or	%g0, %g4		/* cwp = HI_LIMIT */
+	pfx	1
+	wrctl	%g0			/* update istatus */
+
+	/* Now move up the register file, saving as we go. When loop
+	 * is first entered, %g1 is at LO_LIMIT.
+	 */
+0:
+	restore				/* cwp++ */
+	sts	[%sp,0], %l0		/* Save "local" regs*/
+	sts	[%sp,1], %l1
+	sts	[%sp,2], %l2
+	sts	[%sp,3], %l3
+	sts	[%sp,4], %l4
+	sts	[%sp,5], %l5
+	sts	[%sp,6], %l6
+	sts	[%sp,7], %l7
+
+	sts	[%sp,8], %i0		/* Save 'in' regs */
+	sts	[%sp,9], %i1
+	sts	[%sp,10], %i2
+	sts	[%sp,11], %i3
+	sts	[%sp,12], %i4
+	sts	[%sp,13], %i5
+	sts	[%sp,14], %i6
+	sts	[%sp,15], %i7
+
+	cmp	%g1, %g2		/* cwp == HI_LIMIT ? */
+	skps	cc_ne			/* if so, we're done */
+	br	1f
+	nop				/* delay slot */
+
+	inc	%g1			/* g1 <- cwp++ */
+	br	0b
+	nop				/* delay slot */
+
+	/* At this point cwp = HI_LIMIT, so the global/in regs that were
+	 * in place when the underflow occurred must be restored using
+	 * the original stack pointer (saved in g6).
+	 */
+1:
+	mov	%o7, %g7		/* restore return addr */
+	mov	%sp, %g6		/* Restore original sp */
+
+	lds	%g0, [%sp,0]		/* Restore 'global' regs*/
+	lds	%g1, [%sp,1]
+	lds	%g2, [%sp,2]
+	lds	%g3, [%sp,3]
+	lds	%g4, [%sp,4]
+	lds	%g5, [%sp,5]
+	lds	%g6, [%sp,6]
+	lds	%g7, [%sp,7]
+
+	lds	%i0, [%sp,8]		/* Restore 'in' regs*/
+	lds	%i1, [%sp,9]
+	lds	%i2, [%sp,10]
+	lds	%i3, [%sp,11]
+	lds	%i4, [%sp,12]
+	lds	%i5, [%sp,13]
+	lds	%i6, [%sp,14]
+	lds	%i7, [%sp,15]
+
+	tret	%o7			/* All done */
+
+/*************************************************************************
+ * Register window overflow
+ *
+ * The register window overflow exception occurs whenever the highest
+ * valid register window is in use (cwp = HI_LIMIT) and a restore
+ * instruction is issued. Control is transferred to the overflow handler
+ * before the instruction following restore is executed.
+ *
+ * When a register window overflow exception is taken, the exception
+ * handler sees cwp at HI_LIMIT.
+ ************************************************************************/
+	.text
+	.global _cwp_hilimit
+	.align	4
+
+_cwp_hilimit:
+
+	/* Save 'global'/'in' regs on the stack -- will restore when cwp
+	 * is at LO_LIMIT. Locals don't need saving as they are going away.
+	 */
+	sts	[%sp,0], %g0		/* Save "global" regs*/
+	sts	[%sp,1], %g1
+	sts	[%sp,2], %g2
+	sts	[%sp,3], %g3
+	sts	[%sp,4], %g4
+	sts	[%sp,5], %g5
+	sts	[%sp,6], %g6
+	sts	[%sp,7], %g7
+
+	sts	[%sp,8], %i0		/* Save 'in' regs */
+	sts	[%sp,9], %i1
+	sts	[%sp,10], %i2
+	sts	[%sp,11], %i3
+	sts	[%sp,12], %i4
+	sts	[%sp,13], %i5
+	sts	[%sp,14], %i6
+	sts	[%sp,15], %i7
+
+	/* The current %sp must be available in global to restore regs
+	 * saved on stack. Need return addr as well ;-)
+	 */
+	mov	%g7, %o7
+	mov	%g6, %sp
+
+	/* Get HI_LIMIT & LO_LIMIT
+	 */
+	pfx	2			/* WVALID */
+	rdctl	%g1
+	mov	%g2, %g1
+	pfx	0
+	and	%g1, 0x1f		/* g1 <- LO_LIMIT */
+	lsri	%g2, 5
+	pfx	0
+	and	%g2,0x1f		/* g2 <- HI_LIMIT */
+
+	/* Set istatus so cwp = LO_LIMIT after tret
+	 */
+	movi	%g5, 0x1f
+	lsli	%g5, 4
+	not	%g5			/* mask to clr cwp */
+	pfx	1			/* istatus */
+	rdctl	%g0
+	and	%g0, %g5		/* clear cwp field */
+
+	mov	%g4, %g1		/* g4 <- LO_LIMIT */
+	lsli	%g4, 4
+	or	%g0, %g4		/* cwp = LO_LIMIT */
+	pfx	1
+	wrctl	%g0			/* update istatus */
+
+	/* Move to cwp = LO_LIMIT-1 and restore 'in' regs.
+	 */
+	subi	%g4,(1 << 4)		/* g4 <- LO_LIMIT - 1 */
+	rdctl	%g0
+	and	%g0, %g5		/* clear cwp field */
+	or	%g0, %g4		/* cwp = LO_LIMIT - 1 */
+	wrctl	%g0			/* update status */
+	nop
+
+	mov	%sp, %g6		/* Restore sp */
+	lds	%i0, [%sp,8]		/* Restore 'in' regs */
+	lds	%i1, [%sp,9]
+	lds	%i2, [%sp,10]
+	lds	%i3, [%sp,11]
+	lds	%i4, [%sp,12]
+	lds	%i5, [%sp,13]
+	lds	%i6, [%sp,14]		/* sp in next window */
+	lds	%i7, [%sp,15]
+
+	/* Starting at LO_LIMIT-1, move up the register file, restoring
+	 * along the way.
+	 */
+0:
+	restore				/* cwp++ */
+	lds	%l0, [%sp,0]		/* Restore 'local' regs*/
+	lds	%l1, [%sp,1]
+	lds	%l2, [%sp,2]
+	lds	%l3, [%sp,3]
+	lds	%l4, [%sp,4]
+	lds	%l5, [%sp,5]
+	lds	%l6, [%sp,6]
+	lds	%l7, [%sp,7]
+
+	lds	%i0, [%sp,8]		/* Restore 'in' regs */
+	lds	%i1, [%sp,9]
+	lds	%i2, [%sp,10]
+	lds	%i3, [%sp,11]
+	lds	%i4, [%sp,12]
+	lds	%i5, [%sp,13]
+	lds	%i6, [%sp,14]		/* sp in next window */
+	lds	%i7, [%sp,15]
+
+	cmp	%g1, %g2		/* cwp == HI_LIMIT ? */
+	skps	cc_ne			/* if so, we're done */
+	br	1f
+	nop				/* delay slot */
+
+	inc	%g1			/* cwp++ */
+	br	0b
+	nop				/* delay slot */
+
+	/* All windows have been updated at this point, but the globals
+	 * still need to be restored. Go to cwp = LO_LIMIT-1 to get
+	 * some registers to use.
+	 */
+1:
+	rdctl	%g0
+	and	%g0, %g5		/* clear cwp field */
+	or	%g0, %g4		/* cwp = LO_LIMIT - 1 */
+	wrctl	%g0			/* update status */
+	nop
+
+	/* Now there are some registers available to use in restoring
+	 * the globals.
+	 */
+	mov	%sp, %g6
+	mov	%o7, %g7
+
+	lds	%g0, [%sp,0]		/* Restore "global" regs*/
+	lds	%g1, [%sp,1]
+	lds	%g2, [%sp,2]
+	lds	%g3, [%sp,3]
+	lds	%g4, [%sp,4]
+	lds	%g5, [%sp,5]
+	lds	%g6, [%sp,6]
+	lds	%g7, [%sp,7]
+
+	/* The tret moves istatus -> status. istatus was already set for
+	 * cwp = LO_LIMIT.
+	 */
+
+	tret	%o7			/* done */
+
+/*************************************************************************
+ * Default exception handler
+ *
+ * The default handler passes control to external_interrupt(). So trap
+ * or hardware interrupt hanlders can be installed using the familiar
+ * irq_install_handler().
+ *
+ * Here, the stack is fixed-up and cwp is incremented prior to calling
+ * external_interrupt(). This lets the underflow and overflow handlers
+ * operate normally during the exception.
+ ************************************************************************/
+	.text
+	.global _def_xhandler
+	.align	4
+
+_def_xhandler:
+
+	/* Allocate some stack space: 16 words at %sp to accomodate
+	 * a reg window underflow, 8 words to save interrupted task's
+	 * 'out' regs (which are now the 'in' regs), 8 words to preserve
+	 * the 'global' regs and 3 words to save the return address,
+	 * status and istatus. istatus must be saved in the event an
+	 * underflow occurs in a dispatched handler. status is saved so
+	 * a handler can access it on stack.
+	 */
+	pfx	%hi((16+16+3) * 4)
+	subi	%fp, %lo((16+16+3) * 4)
+	mov	%sp, %fp
+
+	/* Save the 'global' regs and the interrupted task's 'out' regs
+	 * (our 'in' regs) along with the return addr, status & istatus.
+	 * First 16 words are for underflow exception.
+	 */
+	rdctl	%l0			/* status */
+	pfx	1			/* istatus */
+	rdctl	%l1
+
+	sts	[%sp,16+0], %g0		/* Save 'global' regs*/
+	sts	[%sp,16+1], %g1
+	sts	[%sp,16+2], %g2
+	sts	[%sp,16+3], %g3
+	sts	[%sp,16+4], %g4
+	sts	[%sp,16+5], %g5
+	sts	[%sp,16+6], %g6
+	sts	[%sp,16+7], %g7
+
+	sts	[%sp,16+8], %i0		/* Save 'in' regs */
+	sts	[%sp,16+9], %i1
+	sts	[%sp,16+10], %i2
+	sts	[%sp,16+11], %i3
+	sts	[%sp,16+12], %i4
+	sts	[%sp,16+13], %i5
+	sts	[%sp,16+14], %i6
+	sts	[%sp,16+15], %i7
+
+	sts	[%sp,16+16], %l0	/* status */
+	sts	[%sp,16+17], %l1	/* istatus */
+	sts	[%sp,16+18], %o7	/* return addr */
+
+	/* Move to cwp+1 ... this guarantees cwp is at or above LO_LIMIT.
+	 * Need to set IPRI=3 and IE=1 to enable underflow exceptions.
+	 * NOTE: only the 'out' regs have been saved ... can't touch
+	 * the 'in' or 'local' here.
+	 */
+	restore				/* cwp++ */
+	rdctl	%o0			/* o0 <- status */
+
+	pfx	%hi(0x7e00)
+	movi	%o1, %lo(0x7e00)
+	not	%o1
+	and	%o0, %o1		/* clear IPRI */
+
+	pfx	%hi(0x8600)
+	movi	%o1, %lo(0x8600)
+	or	%o0, %o1		/* IPRI=3, IE=1 */
+
+	wrctl	%o0			/* o0 -> status */
+	nop
+
+	/* It's ok to call a C routine now since cwp >= LO_LIMIT,
+	 * interrupt task's registers are/will be preserved, and
+	 * underflow exceptions can be handled.
+	 */
+	pfx	%hi(external_interrupt@h)
+	movi	%o1, %lo(external_interrupt@h)
+	pfx	%xhi(external_interrupt@h)
+	movhi	%o1, %xlo(external_interrupt@h)
+	bgen	%o0, 4+2		/* 16 * 4 */
+	add	%o0, %sp		/* Ptr to regs */
+	call	%o1
+	nop
+
+	/* Move back to the exception register window, restore the 'out'
+	 * registers, then return from exception.
+	 */
+	rdctl	%o0			/* o0 <- status */
+	subi	%o0, 16
+	wrctl	%o0			/* cwp-- */
+	nop
+
+	mov	%sp, %fp
+	lds	%g0, [%sp,16+0]		/* Restore 'global' regs*/
+	lds	%g1, [%sp,16+1]
+	lds	%g2, [%sp,16+2]
+	lds	%g3, [%sp,16+3]
+	lds	%g4, [%sp,16+4]
+	lds	%g5, [%sp,16+5]
+	lds	%g6, [%sp,16+6]
+	lds	%g7, [%sp,16+7]
+
+	lds	%i0, [%sp,16+8]		/* Restore 'in' regs*/
+	lds	%i1, [%sp,16+9]
+	lds	%i2, [%sp,16+10]
+	lds	%i3, [%sp,16+11]
+	lds	%i4, [%sp,16+12]
+	lds	%i5, [%sp,16+13]
+	lds	%i6, [%sp,16+14]
+	lds	%i7, [%sp,16+15]
+
+	lds	%l0, [%sp,16+16]	/* status */
+	lds	%l1, [%sp,16+17]	/* istatus */
+	lds	%o7, [%sp,16+18]	/* return addr */
+
+	pfx	1
+	wrctl	%l1			/* restore istatus */
+
+	pfx	%hi((16+16+3) * 4)
+	addi	%sp, %lo((16+16+3) * 4)
+	mov	%fp, %sp
+
+	tret	%o7			/* Done */
+
+
+/*************************************************************************
+ * Timebase Timer Interrupt -- This has identical structure to above,
+ * but calls timer_interrupt().  Doing it this way keeps things similar
+ * to other architectures (e.g. ppc).
+ ************************************************************************/
+	.text
+	.global _timebase_int
+	.align	4
+
+_timebase_int:
+
+	/* Allocate  stack space.
+	 */
+	pfx	%hi((16+16+3) * 4)
+	subi	%fp, %lo((16+16+3) * 4)
+	mov	%sp, %fp
+
+	/* Save the 'global' regs & 'out' regs (our 'in' regs)
+	 */
+	rdctl	%l0			/* status */
+	pfx	1			/* istatus */
+	rdctl	%l1
+
+	sts	[%sp,16+0], %g0		/* Save 'global' regs*/
+	sts	[%sp,16+1], %g1
+	sts	[%sp,16+2], %g2
+	sts	[%sp,16+3], %g3
+	sts	[%sp,16+4], %g4
+	sts	[%sp,16+5], %g5
+	sts	[%sp,16+6], %g6
+	sts	[%sp,16+7], %g7
+
+	sts	[%sp,16+8], %i0		/* Save 'in' regs */
+	sts	[%sp,16+9], %i1
+	sts	[%sp,16+10], %i2
+	sts	[%sp,16+11], %i3
+	sts	[%sp,16+12], %i4
+	sts	[%sp,16+13], %i5
+	sts	[%sp,16+14], %i6
+	sts	[%sp,16+15], %i7
+
+	sts	[%sp,16+16], %l0	/* status */
+	sts	[%sp,16+17], %l1	/* istatus */
+	sts	[%sp,16+18], %o7	/* return addr */
+
+	/* Move to cwp+1.
+	 */
+	restore				/* cwp++ */
+	rdctl	%o0			/* o0 <- status */
+
+	pfx	%hi(0x7e00)
+	movi	%o1, %lo(0x7e00)
+	not	%o1
+	and	%o0, %o1		/* clear IPRI */
+
+	pfx	%hi(0x8600)
+	movi	%o1, %lo(0x8600)
+	or	%o0, %o1		/* IPRI=3, IE=1 */
+
+	wrctl	%o0			/* o0 -> status */
+	nop
+
+	/* Call timer_interrupt()
+	 */
+	pfx	%hi(timer_interrupt@h)
+	movi	%o1, %lo(timer_interrupt@h)
+	pfx	%xhi(timer_interrupt@h)
+	movhi	%o1, %xlo(timer_interrupt@h)
+	bgen	%o0, 4+2		/* 16 * 4 */
+	add	%o0, %sp		/* Ptr to regs */
+	call	%o1
+	nop
+
+	/* Move back to the exception register window, restore the 'out'
+	 * registers, then return from exception.
+	 */
+	rdctl	%o0			/* o0 <- status */
+	subi	%o0, 16
+	wrctl	%o0			/* cwp-- */
+	nop
+
+	mov	%sp, %fp
+	lds	%g0, [%sp,16+0]		/* Restore 'global' regs*/
+	lds	%g1, [%sp,16+1]
+	lds	%g2, [%sp,16+2]
+	lds	%g3, [%sp,16+3]
+	lds	%g4, [%sp,16+4]
+	lds	%g5, [%sp,16+5]
+	lds	%g6, [%sp,16+6]
+	lds	%g7, [%sp,16+7]
+
+	lds	%i0, [%sp,16+8]		/* Restore 'in' regs*/
+	lds	%i1, [%sp,16+9]
+	lds	%i2, [%sp,16+10]
+	lds	%i3, [%sp,16+11]
+	lds	%i4, [%sp,16+12]
+	lds	%i5, [%sp,16+13]
+	lds	%i6, [%sp,16+14]
+	lds	%i7, [%sp,16+15]
+
+	lds	%l0, [%sp,16+16]	/* status */
+	lds	%l1, [%sp,16+17]	/* istatus */
+	lds	%o7, [%sp,16+18]	/* return addr */
+
+	pfx	1
+	wrctl	%l1			/* restore istatus */
+
+	pfx	%hi((16+16+3) * 4)
+	addi	%sp, %lo((16+16+3) * 4)
+	mov	%fp, %sp
+
+	tret	%o7			/* Done */

doc/README.dk1c20

@@ -0,0 +1,84 @@
+
+			 Nios Development Kit
+			   Cyclone Editions
+
+		    Last Update: October 4, 2003
+====================================================================
+
+This file contains information regarding U-Boot and the Altera
+Nios Development Kit, Cyclone Edition (DK-1C20). For general Nios
+information see doc/README.nios.
+
+For those interested in contributing ... see HELP WANTED section
+in doc/README.nios.
+
+
+Files
+------
+	board/dk1c20/*
+	include/configs/DK1C20.h
+
+Memory Organization
+--------------------
+
+  	-The heap is placed below the monitor (U-Boot code).
+  	-Global data is placed below the heap.
+  	-The stack is placed below global data (&grows down).
+
+Misc
+-----
+
+The hello_world example works fine.
+
+
+Programming U-Boot into FLASH with GERMS
+-----------------------------------------
+The current version of the DK-1C20 port occupies less than
+60 KByte. So everything will fit into a single Flash sector.
+To program U-Boot into the DK-1C20 flash using GERMS do the
+following:
+
+1. From the command line, download U-Boot using the nios-run:
+
+	$ nios-run -r u-boot.srec
+
+This takes about 45 seconds (GERMS is not very speedy here).
+After u-boot is downloaded it will be executed. You should
+see the following:
+
+    U-Boot 1.0.0-pre (Oct  4 2003 - 07:39:24)
+
+    CPU: Nios-32 Rev. 3.08 (0x3018)
+    Reg file size: 256 LO_LIMIT/HI_LIMIT: 2/14
+    Board: Altera Nios 1C20 Development Kit
+    In:    serial
+    Out:   serial
+    Err:   serial
+    ==>
+
+
+2. Quit nios-run and start your terminal application (e.g. start
+Hyperterminal or minicom).
+
+3. From the U-Boot command prompt, erase a sector of flash at 0x40000:
+
+    ==> erase 40000 4ffff
+
+4. Download the u-boot code to RAM. When using Hyperterminal, do the
+following:
+
+ --From the u-boot command prompt start a binary download to SRAM:
+
+    ==> loadb 800000
+
+ --Download u-boot.bin using kermit.
+
+5. Copy the binary image from SRAM to flash:
+
+    ==> cp.b 800000 40000 10000
+
+U-Boot will now automatically start when the board is powered on or
+reset using the Standard-32 configuration. To start U-Boot with the
+Safe-32 configuration, enter the following GERMS command:
+
+    + g 40000

doc/README.nios

@@ -0,0 +1,196 @@
+
+			   U-Boot for Nios-32
+
+		    Last Update: October 4, 2003
+====================================================================
+
+This file contains information regarding U-Boot and the Altera
+Nios CPU. For information regarding U-Boot and the Nios Development
+Kit, Cyclone Edition (DK-1C20), see doc/README.dk1c20.
+
+For those interested in contributing ... see HELP WANTED below.
+
+
+1. OVERVIEW
+------------
+
+U-Boot has been successfully tested on the Nios Cyclone development
+board using both the 'safe' and 'standard 32' configurations with
+Nios CPU revision 3.08 (CPU_ID = 0x3008). U-Boot can be used with
+or without the GERMS monitor. The initial version of U-Boot for the
+Cyclone development kit is about 60 Kbyte and will fit in a single
+sector of on-board FLASH. Only the Nios 32-bit CPU is supported.
+
+1.1 GERMS Monitor
+------------------
+If GERMS is just not enough, then U-Boot is a great antibiotic.
+You will be very pleased with its high degree of configurability
+and its rich feature set.
+
+A few of the most obvious limitations of GERMS are overcome by
+using U-Boot (See 'Brain Damage'). Most notably, you can use
+minicom or Hyperterminal (duh).
+
+1.2 Altera Source Code
+-----------------------
+The Nios port does NOT include ANY sources that Altera has the
+copyright. This was a conscious decision ... not an accident.
+The Altera license is not clear in terms of distributing Altera
+sources (when altera silicon is not involved). This isn't really
+a problem as little, if any, of the Altera source contains
+features that are not already available in U-Boot.
+
+The Nios port also does not use the long-winded peripheral
+structure definitions from the Nios SDK.
+
+
+
+2. CONFIGURATION OPTIONS/SETTINGS
+----------------------------------
+
+2.1 Nios-specific Options/Settings
+-----------------------------------
+All configuration options/settings that are specific to Nios begin
+with "CONFIG_NIOS_" or "CFG_NIOS_". The following is a list of
+currently defined Nios-specific options/parameters. If any options
+are related to Standard-32 Nios SDK excalibur.h definitions, the
+related definition follows the description).
+
+
+CONFIG_NIOS -- defined for all Nios-32 boards.
+
+CFG_NIOS_CONSOLE -- the base address of the console UART.
+	(standard-32: na_uart1_base).
+
+CFG_NIOS_FIXEDBAUD -- defined if the console UART PTF fixed_baud
+	parameter is set to '1'.
+
+CFG_NIOS_MULT_HW -- use full hardware multiply (not yet implemented).
+
+CFG_NIOS_MULT_MSTEP -- use hardware assisted multiply using the
+	MSTEP instruction (not yet implemented).
+
+CFG_NIOS_TMRBASE -- the base address of the timer used to support
+	xxx_timer routines (e.g. set_timer(), get_timer(), etc.).
+	(standard-32: na_lo_priority_timer2_base).
+
+CFG_NIOS_TMRIRQ -- the interrupt request (vector number) assigned to
+	the timer. (standard-32: na_low_priority_timer2_irq).
+
+CFG_NIOS_TMRMS -- the period of the timer in milliseconds.
+
+2.2 Differences in U-Boot Options/Settings
+-------------------------------------------
+Some 'standard' U-Boot options/settings are treated differently in
+the Nios port. These are described below.
+
+CFG_GBL_DATA_OFFSET -- in the Nios port, this is the offset of the
+	global data structure in the Nios memory space. More simply,
+	the address of global data.
+
+
+3. ASSEMBLY CODING
+-------------------
+
+In browsing the assembly source files, you may notice the absence
+of the 'magic macros' (e.g. MOVIA, MOVIP, ADDIP etc.). This is
+deliberate. The documentation for the magic macros is scant and
+it is hard to find ... it does not appear in the Nios programmer's
+manual, nor does it appear in the assembler manual. Regardless,
+the macros actually do very little to improve readability anyway.
+
+With this in mind, all assembler modules use only instructions that
+appear in the Nios programmer's manual OR are directly supported
+by the nios-elf toolchain. For example, the 'dec %rB' instruction
+is an alias for 'subi %rB,1' that is supported by the assembler
+but does not appear in the programmer's manual.
+
+
+4. BRAIN DAMAGE
+----------------
+
+This section describes some of the unfortunate and avoidable aspects
+of working with the Nios CPU ... and some things you can do to
+reduce your pain.
+
+4.1 GERMS doesn't work with Hyperterminal
+------------------------------------------
+GERMS doesn't do CR/LF mapping that is compatible with Hyperterminal
+(or minicom) -- geez. Regardless of you opion of Hyperterminal, this
+sad design decision is remedied by using U-Boot.
+
+4.2 cygwin Incompatibility
+---------------------------
+The version of cygwin distributed with the nios GNUPro toolchain is
+out-of-date and incompatible with the latest cygwin distributions.
+In addition, many of the standard utilities are very dated as well.
+If you try to download and build the lastest version of grep for
+example, you'll quickly realize that a native gcc is not available
+(the next topic) which leads to U-Boot build problems (following
+topic).
+
+The solution ... well, you can wait for Altera ... or build as
+set of tools for linux.
+
+4.3 No native gcc
+------------------
+I'm not sure how this one slipped through the cracks ... but it is
+a real pain. Basically, if you want to build anything for the native
+environment -- forget it! A native (cygwin) gcc is not distributed,
+and the old version of cygwin makes locating one challenging.
+
+The solution ... same as above. Just download the gcc source from
+Altera and build up a set of cross tools for your favorite linux
+distro.
+
+4.4 Can't build default U-Boot
+-------------------------------
+By default, when you build U-Boot you will be building some native
+tools along with the target elf, bin, and srec files. Without a
+native gcc, this (obviously) causes problems.
+
+For developers using the Altera cygwin tools you can remove the
+'tools' directory from SUBDIRS in the top-level Makefile. You will
+also have to edit common/Makefile:
+
+Replace:
+environment.o: environment.c ../tools/envcrc
+	$(CC) $(AFLAGS) -Wa,--no-warn \
+		-DENV_CRC=$(shell ../tools/envcrc) \
+		-c -o $@ environment.c
+
+With:
+environment.o: environment.c ../tools/envcrc
+	$(CC) $(AFLAGS) -Wa,--no-warn \
+		-DENV_CRC=0 \
+		-c -o $@ environment.c
+
+BTW, thats a 'zero' ... not the letter 'O'.
+
+
+5. HELP WANTED
+---------------
+
+There are plenty of areas where help is needed. Here's are some ideas
+for those interested in contributing:
+
+-SMC 91C111 support. E.g. add in tftpboot, etc.
+
+-CompactFlash. Port & test CF/FAT.
+
+-ASMI support. Use ASMI for environment, etc.
+
+-Bedbug. Develop bedbug for Nios ... or at least provide a disassemble
+ command.
+
+-Add boot support for ucLinux (niosnommu).
+
+-Implement (don't copy Altera code) the __mulxx routines using the
+ MSTEP and MUL instructions (e.g. CFG_NIOS_MULT_HW and CFG_NIOS_MULT_MSTEP).
+
+
+
+Regards,
+
+--Scott
+<smcnutt@psyent.com>

examples/Makefile

@@ -37,6 +37,10 @@ ifeq ($(ARCH),mips)
 LOAD_ADDR = 0x80200000 -T mips.lds
 endif
 
+ifeq ($(ARCH),nios)
+LOAD_ADDR = 0x01000000 -L $(gcclibdir)/m32 -T nios.lds
+endif
+
 include $(TOPDIR)/config.mk
 
 SREC	= hello_world.srec

examples/nios.lds

@@ -0,0 +1,61 @@
+/*
+ * (C) Copyright 2003, 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
+ */
+
+
+OUTPUT_FORMAT("elf32-nios")
+OUTPUT_ARCH(nios)
+ENTRY(_start)
+
+SECTIONS
+{
+	.text :
+	{
+	  *(.text)
+	}
+        __text_end = .;
+
+        . = ALIGN(4);
+        .rodata :
+	{
+		*(.rodata)
+	}
+	__rodata_end = .;
+
+        . = ALIGN(4);
+        .data :
+	{
+		*(.data)
+	}
+	. = ALIGN(4);
+	__data_end = .;
+
+	__bss_start = .;
+        . = ALIGN(4);
+        .bss :
+	{
+		*(.bss)
+	}
+	. = ALIGN(4);
+	__bss_end = .;
+}
+

examples/stubs.c

@@ -61,6 +61,23 @@ gd_t *global_data;
 "	lw	$25, %1($25)\n"		\
 "	jr	$25\n"			\
 	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "t9");
+#elif defined(CONFIG_NIOS)
+/*
+ * %g7 holds the pointer to the global_data. %g0 is call clobbered.
+ */
+#define EXPORT_FUNC(x) \
+	asm volatile (			\
+"	.globl " #x "\n"		\
+#x ":\n"				\
+"	pfx	%%hi(%0)\n"		\
+"	movi	%%g0, %%lo(%0)\n"	\
+"	add	%%g0, %%g7\n"		\
+"	ld	%%g0, [%%g0]\n"		\
+"	pfx	%1\n"			\
+"	ld	%%g0, [%%g0]\n"		\
+"	jmp	%%g0\n"			\
+"	nop	\n"			\
+	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x) : "r0");
 #else
 #error stubs definition missing for this architecture
 #endif

include/asm-nios/bitops.h

@@ -0,0 +1,37 @@
+/*
+ * (C) Copyright 2003, 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
+ */
+
+#ifndef _ASM_NIOS_BITOPS_H_
+#define _ASM_NIOS_BITOPS_H_
+
+
+extern void set_bit(int nr, volatile void * a);
+extern void clear_bit(int nr, volatile void * a);
+extern int test_and_clear_bit(int nr, volatile void * a);
+extern void change_bit(unsigned long nr, volatile void *addr);
+extern int test_and_set_bit(int nr, volatile void * a);
+extern int test_and_change_bit(int nr, volatile void * addr);
+extern int test_bit(int nr, volatile void * a);
+extern int ffs(int i);
+
+#endif /* _ASM_NIOS_BITOPS_H */

include/asm-nios/byteorder.h

@@ -0,0 +1,31 @@
+/*
+* (C) Copyright 2003, 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
+*/
+
+#ifndef __ASM_NIOS_BYTEORDER_H
+#define __ASM_NIOS_BYTEORDER_H
+
+#include <asm/types.h>
+#include <linux/byteorder/little_endian.h>
+
+#endif
+

include/asm-nios/global_data.h

@@ -0,0 +1,46 @@
+/*
+ * (C) Copyright 2003, 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
+ */
+
+#ifndef	__ASM_NIOS_GLOBALDATA_H
+#define __ASM_NIOS_GLOBALDATA_H
+
+typedef	struct	global_data {
+	bd_t		*bd;
+	unsigned long	flags;
+	unsigned long	baudrate;
+	unsigned long	cpu_clk;	/* CPU clock in Hz!		*/
+	unsigned long	have_console;	/* serial_init() was called */
+	unsigned long	ram_size;	/* RAM size */
+	unsigned long	reloc_off;	/* Relocation Offset */
+	unsigned long	env_addr;	/* Address  of Environment struct */
+	unsigned long	env_valid;	/* Checksum of Environment valid */
+	void		**jt;		/* Standalone app jump table */
+} gd_t;
+
+/* flags */
+#define	GD_FLG_RELOC	0x00001		/* Code was relocated to RAM		*/
+#define	GD_FLG_DEVINIT	0x00002		/* Devices have been initialized	*/
+
+#define DECLARE_GLOBAL_DATA_PTR     register gd_t *gd asm ("%g7")
+
+#endif /* __ASM_NIOS_GLOBALDATA_H */

include/asm-nios/io.h

@@ -0,0 +1 @@
+/*FIXME: Implement this! */

include/asm-nios/posix_types.h

@@ -0,0 +1,63 @@
+#ifndef __ASM_NIOS_POSIX_TYPES_H
+#define __ASM_NIOS_POSIX_TYPES_H
+
+/*
+ * This file is generally used by user-level software, so you need to
+ * be a little careful about namespace pollution etc.  Also, we cannot
+ * assume GCC is being used.
+ */
+
+typedef unsigned short	__kernel_dev_t;
+typedef unsigned long	__kernel_ino_t;
+typedef unsigned short	__kernel_mode_t;
+typedef unsigned short	__kernel_nlink_t;
+typedef long		__kernel_off_t;
+typedef int		__kernel_pid_t;
+typedef unsigned short	__kernel_ipc_pid_t;
+typedef unsigned short	__kernel_uid_t;
+typedef unsigned short	__kernel_gid_t;
+typedef unsigned long	__kernel_size_t;
+typedef int		__kernel_ssize_t;
+typedef int		__kernel_ptrdiff_t;
+typedef long		__kernel_time_t;
+typedef long		__kernel_suseconds_t;
+typedef long		__kernel_clock_t;
+typedef int		__kernel_daddr_t;
+typedef char *		__kernel_caddr_t;
+typedef unsigned short	__kernel_uid16_t;
+typedef unsigned short	__kernel_gid16_t;
+typedef unsigned int	__kernel_uid32_t;
+typedef unsigned int	__kernel_gid32_t;
+
+typedef unsigned short	__kernel_old_uid_t;
+typedef unsigned short	__kernel_old_gid_t;
+
+#ifdef __GNUC__
+typedef long long	__kernel_loff_t;
+#endif
+
+typedef struct {
+#if defined(__KERNEL__) || defined(__USE_ALL)
+	int	val[2];
+#else /* !defined(__KERNEL__) && !defined(__USE_ALL) */
+	int	__val[2];
+#endif /* !defined(__KERNEL__) && !defined(__USE_ALL) */
+} __kernel_fsid_t;
+
+#if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)
+
+#undef	__FD_SET
+#define	__FD_SET(d, set)	((set)->fds_bits[__FDELT(d)] |= __FDMASK(d))
+
+#undef	__FD_CLR
+#define	__FD_CLR(d, set)	((set)->fds_bits[__FDELT(d)] &= ~__FDMASK(d))
+
+#undef	__FD_ISSET
+#define	__FD_ISSET(d, set)	((set)->fds_bits[__FDELT(d)] & __FDMASK(d))
+
+#undef	__FD_ZERO
+#define __FD_ZERO(fdsetp) (memset (fdsetp, 0, sizeof(*(fd_set *)fdsetp)))
+
+#endif /* defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2) */
+
+#endif

include/asm-nios/processor.h

@@ -0,0 +1 @@
+/* FIXME: Implement this! */

include/asm-nios/psr.h

@@ -0,0 +1,29 @@
+/*
+ * (C) Copyright 2003, 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
+ */
+
+#ifndef _NIOS_PSR_H
+#define _NIOS_PSR_H
+
+
+
+#endif /* _NIOS_PSR_H */

include/asm-nios/ptrace.h

@@ -0,0 +1,36 @@
+/*
+ * (C) Copyright 2003, 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
+ */
+
+#ifndef _NIOS_PTRACE_H
+#define _NIOS_PTRACE_H
+
+struct pt_regs {
+	unsigned global[8];
+	unsigned in[8];
+	unsigned status;
+	unsigned istatus;
+	unsigned retaddr;
+};
+
+
+#endif /* _NIOS_PTRACE_H */

include/asm-nios/string.h

@@ -0,0 +1,25 @@
+#ifndef __ASM_NIOS_STRING_H
+#define __ASM_NIOS_STRING_H
+
+#undef __HAVE_ARCH_STRRCHR
+extern char * strrchr(const char * s, int c);
+
+#undef __HAVE_ARCH_STRCHR
+extern char * strchr(const char * s, int c);
+
+#undef __HAVE_ARCH_MEMCPY
+extern void * memcpy(void *, const void *, __kernel_size_t);
+
+#undef __HAVE_ARCH_MEMMOVE
+extern void * memmove(void *, const void *, __kernel_size_t);
+
+#undef __HAVE_ARCH_MEMCHR
+extern void * memchr(const void *, int, __kernel_size_t);
+
+#undef __HAVE_ARCH_MEMSET
+extern void * memset(void *, int, __kernel_size_t);
+
+#undef __HAVE_ARCH_MEMZERO
+extern void memzero(void *ptr, __kernel_size_t n);
+
+#endif

include/asm-nios/system.h

@@ -0,0 +1,4 @@
+#ifndef _ASM_NIOS_SYSTEM_H_
+#define _ASM_NIOS_SYSTEM_H_
+
+#endif /* _ASM_NIOS_SYSTEM_H */

include/asm-nios/types.h

@@ -0,0 +1,57 @@
+#ifndef _NIOS_TYPES_H
+#define _NIOS_TYPES_H
+
+/*
+ * This file is never included by application software unless
+ * explicitly requested (e.g., via linux/types.h) in which case the
+ * application is Linux specific so (user-) name space pollution is
+ * not a major issue.  However, for interoperability, libraries still
+ * need to be careful to avoid a name clashes.
+ */
+
+typedef unsigned short umode_t;
+
+/*
+ * __xx is ok: it doesn't pollute the POSIX namespace. Use these in the
+ * header files exported to user space
+ */
+
+typedef __signed__ char __s8;
+typedef unsigned char __u8;
+
+typedef __signed__ short __s16;
+typedef unsigned short __u16;
+
+typedef __signed__ int __s32;
+typedef unsigned int __u32;
+
+#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
+typedef __signed__ long long __s64;
+typedef unsigned long long __u64;
+#endif
+
+/*
+ * These aren't exported outside the kernel to avoid name space clashes
+ */
+#ifdef __KERNEL__
+
+typedef signed char s8;
+typedef unsigned char u8;
+
+typedef signed short s16;
+typedef unsigned short u16;
+
+typedef signed int s32;
+typedef unsigned int u32;
+
+typedef signed long long s64;
+typedef unsigned long long u64;
+
+#define BITS_PER_LONG 32
+
+/* Dma addresses are 32-bits wide.  */
+
+typedef u32 dma_addr_t;
+#endif /* __KERNEL__ */
+
+#endif /* _NIOS_TYPES_H */

include/asm-nios/u-boot.h

@@ -0,0 +1,42 @@
+/*
+ * (C) Copyright 2003
+ * Psyent Corporation
+ * 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
+ */
+
+#ifndef _U_BOOT_H_
+#define _U_BOOT_H_
+
+typedef struct bd_info {
+	unsigned long	bi_memstart;	/* start of DRAM memory */
+	unsigned long	bi_memsize;	/* size	 of DRAM memory in bytes */
+	unsigned long	bi_flashstart;	/* start of FLASH memory */
+	unsigned long	bi_flashsize;	/* size	 of FLASH memory */
+	unsigned long	bi_flashoffset; /* reserved area for startup monitor */
+	unsigned long	bi_sramstart;	/* start of SRAM memory */
+	unsigned long	bi_sramsize;	/* size	 of SRAM memory */
+	unsigned long	bi_ip_addr;	/* IP Address */
+	unsigned char	bi_enetaddr[6]; /* Ethernet adress */
+	unsigned long	bi_baudrate;	/* Console Baudrate */
+} bd_t;
+
+
+#endif	/* _U_BOOT_H_ */

include/configs/DK1C20.h

@@ -0,0 +1,171 @@
+/*
+ * (C) Copyright 2003, 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
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+/*------------------------------------------------------------------------
+ * BOARD/CPU -- TOP-LEVEL
+ *----------------------------------------------------------------------*/
+#define CONFIG_NIOS		1		/* NIOS-32 core		*/
+#define	CONFIG_DK1C20		1		/* Cyclone DK-1C20 board*/
+#define CONFIG_SYS_CLK_FREQ	50000000	/* 50 MHz core clock	*/
+
+/*------------------------------------------------------------------------
+ * BASE ADDRESSES
+ *----------------------------------------------------------------------*/
+#define CFG_FLASH_BASE		0x00000000	/* Flash memory base	*/
+#define CFG_SRAM_BASE		0x00800000	/* External SRAM	*/
+#define CFG_SRAM_SIZE		0x00100000	/* 1 MByte 		*/
+#define CFG_SDRAM_BASE		0x01000000	/* SDRAM base addr	*/
+#define CFG_SDRAM_SIZE		0x01000000	/* 16 MByte		*/
+#define CFG_VECT_BASE		0x008fff00	/* Vector table addr	*/
+
+/*------------------------------------------------------------------------
+ * MEMORY ORGANIZATION - For the most part, you can put things pretty
+ * much anywhere. This is pretty flexible for Nios. So here we make some
+ * arbitrary choices & assume that the monitor is placed at the end of
+ * a memory resource (so you must make sure TEXT_BASE is chosen
+ * appropriately).
+ *
+ * 	-The heap is placed below the monitor.
+ * 	-Global data is placed below the heap.
+ * 	-The stack is placed below global data (&grows down).
+ *----------------------------------------------------------------------*/
+#define CFG_MONITOR_LEN		(256 * 1024)	/* Reserve 256k		*/
+#define CFG_ENV_SIZE		0x10000		/* 64 KByte (1 sector)	*/
+#define CFG_GBL_DATA_SIZE	128		/* Global data size rsvd*/
+#define CFG_MALLOC_LEN		(CFG_ENV_SIZE + 128*1024)
+
+#define CFG_MONITOR_BASE	TEXT_BASE
+#define CFG_MALLOC_BASE		(CFG_MONITOR_BASE - CFG_MALLOC_LEN)
+#define CFG_GBL_DATA_OFFSET	(CFG_MALLOC_BASE -CFG_GBL_DATA_SIZE)
+#define CFG_INIT_SP		CFG_GBL_DATA_OFFSET
+
+/*------------------------------------------------------------------------
+ * FLASH
+ *----------------------------------------------------------------------*/
+#define CFG_MAX_FLASH_SECT	128		/* Max # sects per bank */
+#define CFG_MAX_FLASH_BANKS	1		/* Max # of flash banks */
+#define CFG_FLASH_ERASE_TOUT	8000		/* Erase timeout (msec) */
+#define CFG_FLASH_WRITE_TOUT	100		/* Write timeout (msec) */
+
+/*------------------------------------------------------------------------
+ * ENVIRONMENT
+ *----------------------------------------------------------------------*/
+#define	CFG_ENV_IS_IN_FLASH	1		/* Environment in flash */
+#define CFG_ENV_ADDR		0x00000000	/* Mem addr of env	*/
+#define CONFIG_ENV_OVERWRITE			/* Serial/eth change Ok */
+
+/*------------------------------------------------------------------------
+ * CONSOLE
+ *----------------------------------------------------------------------*/
+#define CFG_NIOS_CONSOLE	0x00920900	/* Cons uart base addr	*/
+#define CFG_NIOS_FIXEDBAUD	1		/* Baudrate is fixed	*/
+#define CFG_BAUDRATE_TABLE  { 9600, 19200, 38400, 57600, 115200 }
+#define CONFIG_BAUDRATE		115200
+
+/*------------------------------------------------------------------------
+ * TIMER FOR TIMEBASE -- Nios doesn't have the equivalent of ppc  PIT,
+ * so an avalon bus timer is required.
+ *----------------------------------------------------------------------*/
+#define CFG_NIOS_TMRBASE	0x009209e0
+#define CFG_NIOS_TMRIRQ		50
+#define CFG_NIOS_TMRMS		10
+
+/*------------------------------------------------------------------------
+ * Ethernet -- needs work!
+ *----------------------------------------------------------------------*/
+#if 0
+#define CONFIG_DRIVER_SMC91111			/* Using SMC91c111	*/
+#define CONFIG_SMC91111_BASE	0x00910000	/* Base address		*/
+#undef  CONFIG_SMC91111_EXT_PHY			/* No external PHY	*/
+#define CONFIG_SMC_USE_32_BIT	1		/* 32-bit i/f		*/
+#endif
+
+#define CONFIG_ETHADDR		08:00:3e:26:0a:5b
+#define CONFIG_NETMASK		255.255.255.0
+#define CONFIG_IPADDR		192.168.2.21
+#define CONFIG_SERVERIP		192.168.2.16
+
+/*------------------------------------------------------------------------
+ * COMMANDS
+ *----------------------------------------------------------------------*/
+#define CONFIG_COMMANDS		(CFG_CMD_ALL & ~( \
+				 CFG_CMD_ASKENV | \
+				 CFG_CMD_BEDBUG | \
+				 CFG_CMD_BMP	| \
+				 CFG_CMD_BSP	| \
+				 CFG_CMD_CACHE	| \
+				 CFG_CMD_DATE	| \
+				 CFG_CMD_DOC	| \
+				 CFG_CMD_DTT	| \
+				 CFG_CMD_EEPROM | \
+				 CFG_CMD_ELF    | \
+				 CFG_CMD_FAT	| \
+				 CFG_CMD_FDC	| \
+				 CFG_CMD_FDOS	| \
+				 CFG_CMD_HWFLOW	| \
+				 CFG_CMD_IDE	| \
+				 CFG_CMD_I2C	| \
+				 CFG_CMD_JFFS2	| \
+				 CFG_CMD_KGDB	| \
+				 CFG_CMD_NAND	| \
+				 CFG_CMD_NET	| \
+				 CFG_CMD_MMC	| \
+				 CFG_CMD_MII	| \
+				 CFG_CMD_PCI	| \
+				 CFG_CMD_PCMCIA | \
+				 CFG_CMD_SCSI	| \
+				 CFG_CMD_SPI	| \
+				 CFG_CMD_VFD	| \
+				 CFG_CMD_USB	) )
+
+
+#include <cmd_confdefs.h>
+
+/*------------------------------------------------------------------------
+ * KGDB
+ *----------------------------------------------------------------------*/
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+#define CONFIG_KGDB_BAUDRATE	9600
+#endif
+
+/*------------------------------------------------------------------------
+ * MISC
+ *----------------------------------------------------------------------*/
+#define	CFG_LONGHELP				/* undef to save memory		*/
+#define	CFG_PROMPT		"==> "	/* Monitor Command Prompt	*/
+#define	CFG_CBSIZE		256		/* Console I/O Buffer Size	*/
+#define	CFG_PBSIZE (CFG_CBSIZE+sizeof(CFG_PROMPT)+16) /* Print Buffer Size */
+#define	CFG_MAXARGS		16		/* max number of command args	*/
+#define CFG_BARGSIZE		CFG_CBSIZE	/* Boot Argument Buffer Size	*/
+#undef  CFG_CLKS_IN_HZ
+#define	CFG_HZ			1562500
+#define CFG_LOAD_ADDR		0x00800000	/* Default load address */
+
+#define CFG_MEMTEST_START	0x00000000
+#define CFG_MEMTEST_END		0x00000000
+
+
+#endif	/* __CONFIG_H */

include/image.h

@@ -65,6 +65,7 @@
 #define IH_CPU_SPARC		10	/* Sparc	*/
 #define IH_CPU_SPARC64		11	/* Sparc 64 Bit */
 #define	IH_CPU_M68K		12	/* M68K		*/
+#define	IH_CPU_NIOS		13	/* Nios-32	*/
 
 /*
  * Image Types

include/nios-io.h

@@ -0,0 +1,96 @@
+/*
+ * (C) Copyright 2003, 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
+ */
+
+/*************************************************************************
+ * Altera Nios Standard Peripherals
+ ************************************************************************/
+
+#ifndef __NIOSIO_H__
+#define __NIOSIO_H__
+
+/*------------------------------------------------------------------------
+ * UART
+ *----------------------------------------------------------------------*/
+typedef volatile struct nios_uart_t {
+	unsigned	rxdata;		/* Rx data reg */
+	unsigned	txdata;		/* Tx data reg */
+	unsigned	status;		/* Status reg */
+	unsigned	control;	/* Control reg */
+	unsigned	divisor;	/* Baud rate divisor reg */
+	unsigned	endofpacket;	/* End-of-packet reg */
+}nios_uart_t;
+
+/* status register */
+#define NIOS_UART_PE		(1 << 0)	/* parity error */
+#define NIOS_UART_FE		(1 << 1)	/* frame error */
+#define NIOS_UART_BRK		(1 << 2)	/* break detect */
+#define NIOS_UART_ROE		(1 << 3)	/* rx overrun */
+#define NIOS_UART_TOE		(1 << 4)	/* tx overrun */
+#define NIOS_UART_TMT		(1 << 5)	/* tx empty */
+#define NIOS_UART_TRDY		(1 << 6)	/* tx ready */
+#define NIOS_UART_RRDY		(1 << 7)	/* rx ready */
+#define NIOS_UART_E		(1 << 8)	/* exception */
+#define NIOS_UART_DCTS		(1 << 10)	/* cts change */
+#define NIOS_UART_CTS		(1 << 11)	/* cts */
+#define NIOS_UART_EOP		(1 << 12)	/* eop detected */
+
+/* control register */
+#define NIOS_UART_IPE		(1 << 0)	/* parity error int ena*/
+#define NIOS_UART_IFE		(1 << 1)	/* frame error int ena */
+#define NIOS_UART_IBRK		(1 << 2)	/* break detect int ena */
+#define NIOS_UART_IROE		(1 << 3)	/* rx overrun int ena */
+#define NIOS_UART_ITOE		(1 << 4)	/* tx overrun int ena */
+#define NIOS_UART_ITMT		(1 << 5)	/* tx empty int ena */
+#define NIOS_UART_ITRDY		(1 << 6)	/* tx ready int ena */
+#define NIOS_UART_IRRDY		(1 << 7)	/* rx ready int ena */
+#define NIOS_UART_IE		(1 << 8)	/* exception int ena */
+#define NIOS_UART_TBRK		(1 << 9)	/* transmit break */
+#define NIOS_UART_IDCTS		(1 << 10)	/* cts change int ena */
+#define NIOS_UART_RTS		(1 << 11)	/* rts */
+#define NIOS_UART_IEOP		(1 << 12)	/* eop detected int ena */
+
+
+/*------------------------------------------------------------------------
+ * TIMER
+ *----------------------------------------------------------------------*/
+typedef volatile struct nios_timer_t {
+	unsigned	status;			/* Timer status reg */
+	unsigned	control;		/* Timer control reg */
+	unsigned	periodl;		/* Timeout period low */
+	unsigned	periodh;		/* Timeout period high */
+	unsigned	snapl;			/* Snapshot low */
+	unsigned	snaph;			/* Snapshot high */
+}nios_timer_t;
+
+/* status register */
+#define NIOS_TIMER_TO		(1 << 0)	/* Timeout */
+#define NIOS_TIMER_RUN		(1 << 1)	/* Timer running */
+
+/* control register */
+#define NIOS_TIMER_ITO		(1 << 0)	/* Timeout int ena */
+#define NIOS_TIMER_CONT		(1 << 1)	/* Continuous mode */
+#define NIOS_TIMER_START	(1 << 2)	/* Start timer */
+#define NIOS_TIMER_STOP		(1 << 3)	/* Stop timer */
+
+#endif /* __NIOSIO_H__ */
+

include/nios.h

@@ -0,0 +1,77 @@
+/*
+ * (C) Copyright 2003, 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
+ */
+
+#ifndef __NIOS_H__
+#define __NIOS_H__
+
+/*------------------------------------------------------------------------
+ * Control registers -- use with wrctl() & rdctl()
+ *----------------------------------------------------------------------*/
+#define CTL_STATUS	0x00		/* Processor status		*/
+#define CTL_ISTATUS	0x01		/* Saved status (exception)	*/
+#define CTL_WVALID	0x02		/* Valid window limit		*/
+#define CTL_ICACHE	0x05		/* I-cache line-invalidate	*/
+#define CTL_CPU_ID	0x06		/* CPU version id		*/
+#define CTL_DCACHE	0x07		/* D-cache line-invalidate	*/
+#define CTL_CLR_IE	0x08		/* Interrupt clear (disable)	*/
+#define CTL_SET_IE	0x09		/* Interrupt set (enable)	*/
+
+/*------------------------------------------------------------------------
+ * Access to control regs
+ *----------------------------------------------------------------------*/
+#define _str_(s)	#s
+
+#define rdctl(reg)\
+	({unsigned int val;\
+	asm volatile( "pfx " _str_(reg) "\n\t rdctl %0"\
+		: "=r" (val) ); val;})
+
+#define wrctl(reg,val)\
+	asm volatile( "pfx " _str_(reg) "\n\t wrctl %0 \n\t nop"\
+		: : "r" (val))
+
+/*------------------------------------------------------------------------
+ * Control reg bit masks
+ *----------------------------------------------------------------------*/
+#define STATUS_DC	(1<<17)		/* Data cache enable		*/
+#define STATUS_IC	(1<<16)		/* Instruction cache enable	*/
+#define STATUS_IE	(1<<15)		/* Interrupt enable		*/
+#define STATUS_IPRI	(0x3f<<9)	/* Interrupt priority		*/
+#define STATUS_CWP	(0x1f<<4)	/* Current window pointer	*/
+#define STATUS_N	(1<<3)		/* Condition code: negative	*/
+#define STATUS_V	(1<<2)		/* Condition code: overflow	*/
+#define STATUS_Z	(1<<1)		/* Condition code: zero		*/
+#define STATUS_C	(1<<0)		/* Condition code: carry/borrow */
+
+static inline unsigned ipri( unsigned prio )
+{
+	unsigned tmp;
+	unsigned status = rdctl(CTL_STATUS);
+	prio = (prio << 9) & STATUS_IPRI;
+	tmp = (status & ~STATUS_IPRI) | prio;
+	wrctl(CTL_STATUS,tmp);
+	return( (status & STATUS_IPRI) >> 9);
+}
+
+
+#endif /* __NIOS_H__ */

lib_nios/Makefile

@@ -0,0 +1,44 @@
+#
+# (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
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= lib$(ARCH).a
+
+AOBJS	=
+
+COBJS	= board.o cache.o divmod.o nios_linux.o mult.o time.o
+
+OBJS	= $(AOBJS) $(COBJS)
+
+$(LIB):	.depend $(OBJS)
+	$(AR) crv $@ $(OBJS)
+
+#########################################################################
+
+.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
+		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+
+sinclude .depend
+
+#########################################################################

lib_nios/board.c

@@ -0,0 +1,166 @@
+/*
+ * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
+ * Scott McNutt <smcnutt@psyent.com>
+ *
+ * (C) Copyright 2000-2002
+ * 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>
+#include <devices.h>
+#include <watchdog.h>
+
+
+/*
+ * All attempts to come up with a "common" initialization sequence
+ * that works for all boards and architectures failed: some of the
+ * requirements are just _too_ different. To get rid of the resulting
+ * mess of board dependend #ifdef'ed code we now make the whole
+ * initialization sequence configurable to the user.
+ *
+ * The requirements for any new initalization function is simple: it
+ * receives a pointer to the "global data" structure as it's only
+ * argument, and returns an integer return code, where 0 means
+ * "continue" and != 0 means "fatal error, hang the system".
+ */
+
+
+extern void malloc_bin_reloc (void);
+typedef int (init_fnc_t) (void);
+extern unsigned _vectors[];
+
+/*
+ * Begin and End of memory area for malloc(), and current "brk"
+ */
+static	ulong	mem_malloc_start = 0;
+static	ulong	mem_malloc_end	 = 0;
+static	ulong	mem_malloc_brk	 = 0;
+
+/*
+ * The Malloc area is immediately below the monitor copy in RAM
+ */
+static void mem_malloc_init (void)
+{
+	mem_malloc_start = CFG_MALLOC_BASE;
+	mem_malloc_end = mem_malloc_start + CFG_MALLOC_LEN;
+	mem_malloc_brk = mem_malloc_start;
+	memset ((void *) mem_malloc_start,
+		0,
+		mem_malloc_end - mem_malloc_start);
+}
+
+void *sbrk (ptrdiff_t increment)
+{
+	ulong old = mem_malloc_brk;
+	ulong new = old + increment;
+
+	if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
+		return (NULL);
+	}
+	mem_malloc_brk = new;
+	return ((void *) old);
+}
+
+
+/************************************************************************
+ * Initialization sequence						*
+ ***********************************************************************/
+
+init_fnc_t *init_sequence[] = {
+
+#if defined(CONFIG_BOARD_PRE_INIT)
+	board_pre_init,		/* Call board-specific init code early.*/
+#endif
+
+	env_init,
+	serial_init,
+	console_init_f,
+	display_options,
+	checkcpu,
+	checkboard,
+	NULL,			/* Terminate this list */
+};
+
+
+/***********************************************************************/
+void board_init (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	bd_t *bd;
+	init_fnc_t **init_fnc_ptr;
+
+	/* Pointer is writable since we allocated a register for it.
+	 * Nios treats CFG_GBL_DATA_OFFSET as an address.
+	 */
+	gd = (gd_t *)CFG_GBL_DATA_OFFSET;
+	memset( gd, 0, CFG_GBL_DATA_SIZE );
+
+	/* Copy exception vectors to the correct location.
+	 */
+	memcpy( (void *)CFG_VECT_BASE, _vectors, 256 );
+
+	gd->bd = (bd_t *)(gd+1);	/* At end of global data */
+	gd->baudrate = CONFIG_BAUDRATE;
+	gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
+
+	bd = gd->bd;
+	bd->bi_memstart	= CFG_SDRAM_BASE;
+	bd->bi_memsize = CFG_SDRAM_SIZE;
+	bd->bi_flashstart = CFG_FLASH_BASE;
+	bd->bi_sramstart= CFG_SRAM_BASE;
+	bd->bi_sramsize	= CFG_SRAM_SIZE;
+	bd->bi_baudrate	= CONFIG_BAUDRATE;
+
+	for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
+		if ((*init_fnc_ptr) () != 0) {
+			hang ();
+		}
+	}
+
+	bd->bi_flashsize = flash_init();
+
+	mem_malloc_init();
+	malloc_bin_reloc();
+	env_relocate();
+
+	devices_init();
+	jumptable_init();
+	console_init_r();
+	/*
+	 */
+
+	interrupt_init ();
+	/* main_loop */
+	for (;;) {
+		WATCHDOG_RESET ();
+		main_loop ();
+	}
+}
+
+
+/***********************************************************************/
+
+void hang (void)
+{
+	puts("### ERROR ### Please reset board ###\n");
+	for (;;);
+}

lib_nios/cache.c

@@ -0,0 +1,32 @@
+/*
+ * (C) Copyright 2003, 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>
+
+
+void flush_cache (ulong addr, ulong size)
+{
+	/* Nios cache is write-thru -- nothing to do here.
+	 */
+	return;
+}

lib_nios/divmod.c

@@ -0,0 +1,101 @@
+/*
+ * This file is part of GNU CC.
+ *
+ * GNU CC 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, or (at your
+ * option) any later version.
+ *
+ * GNU CC 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 GNU CC; see the file COPYING.  If not, write
+ * to the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#include "math.h"
+
+USItype udivmodsi4 (USItype num, USItype den, word_type modwanted)
+{
+	USItype bit = 1;
+	USItype res = 0;
+
+	while (den < num && bit && !(den & (1L << 31))) {
+		den <<= 1;
+		bit <<= 1;
+	}
+	while (bit) {
+		if (num >= den) {
+			num -= den;
+			res |= bit;
+		}
+		bit >>= 1;
+		den >>= 1;
+	}
+	if (modwanted)
+		return num;
+	return res;
+}
+
+
+SItype __divsi3 (SItype a, SItype b)
+{
+	word_type neg = 0;
+	SItype res;
+
+	if (a < 0) {
+		a = -a;
+		neg = !neg;
+	}
+
+	if (b < 0) {
+		b = -b;
+		neg = !neg;
+	}
+
+	res = udivmodsi4 (a, b, 0);
+
+	if (neg)
+		res = -res;
+
+	return res;
+}
+
+
+SItype __modsi3 (SItype a, SItype b)
+{
+	word_type neg = 0;
+	SItype res;
+
+	if (a < 0) {
+		a = -a;
+		neg = 1;
+	}
+
+	if (b < 0)
+		b = -b;
+
+	res = udivmodsi4 (a, b, 1);
+
+	if (neg)
+		res = -res;
+
+	return res;
+}
+
+
+SItype __udivsi3 (SItype a, SItype b)
+{
+	return udivmodsi4 (a, b, 0);
+}
+
+
+SItype __umodsi3 (SItype a, SItype b)
+{
+	return udivmodsi4 (a, b, 1);
+}

lib_nios/math.h

@@ -0,0 +1,16 @@
+#define BITS_PER_UNIT	8
+
+typedef 	 int HItype		__attribute__ ((mode (HI)));
+typedef unsigned int UHItype		__attribute__ ((mode (HI)));
+
+typedef		 int SItype		__attribute__ ((mode (SI)));
+typedef unsigned int USItype		__attribute__ ((mode (SI)));
+
+typedef int word_type			__attribute__ ((mode (__word__)));
+
+struct SIstruct {HItype low, high;};
+
+typedef union {
+	struct SIstruct s;
+	SItype ll;
+} SIunion;

lib_nios/mult.c

@@ -0,0 +1,56 @@
+/*
+ * This file is part of GNU CC.
+ *
+ * GNU CC 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, or (at your
+ * option) any later version.
+ *
+ * GNU CC 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 GNU CC; see the file COPYING.  If not, write
+ * to the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#include <common.h>
+
+#if !defined(CFG_NIOS_MULT_HW) && !defined(CFG_NIOS_MULT_MSTEP)
+
+#include "math.h"
+
+USItype __mulsi3 (USItype a, USItype b)
+{
+	USItype c = 0;
+
+	while (a != 0) {
+		if (a & 1)
+			c += b;
+		a >>= 1;
+		b <<= 1;
+	}
+
+	return c;
+}
+
+
+UHItype __mulhi3 (UHItype a, UHItype b)
+{
+	UHItype c = 0;
+
+	while (a != 0) {
+		if (a & 1)
+			c += b;
+		a >>= 1;
+		b <<= 1;
+	}
+
+	return c;
+}
+
+#endif /*!defined(CFG_NIOS_MULT_HW) && !defined(CFG_NIOS_MULT_MSTEP) */

lib_nios/nios_linux.c

@@ -0,0 +1,34 @@
+/*
+ * (C) Copyright 2003, 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 <command.h>
+
+/* FIXME: Once we find a stable version of uC-linux for nios
+ * we can get this working. ;-)
+ *
+ */
+void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
+		ulong addr, ulong *len_ptr, int   verify)
+{
+}

lib_nios/time.c

@@ -0,0 +1,37 @@
+/*
+ * (C) Copyright 2003, 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>
+
+
+extern void dly_clks( unsigned long ticks );
+
+void udelay(unsigned long usec)
+{
+	/* The Nios core doesn't have a timebase, so we do our
+	 * best for now and call a low-level loop that counts
+	 * cpu clocks.
+	 */
+	unsigned long cnt = (CONFIG_SYS_CLK_FREQ/1000000) * usec;
+	dly_clks (cnt);
+}

nios_config.mk

@@ -0,0 +1,25 @@
+#
+# (C) Copyright 2003
+# 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
+#
+
+PLATFORM_CPPFLAGS += -m32 -DCONFIG_NIOS -ffixed-g7