lib_arm/armlinux.c - platform/external/u-boot - Gitiles

 /*
  * (C) Copyright 2002
  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  * Marius Groeger <mgroeger@sysgo.de>
  *
  * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
  *
  * 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>
 #include <image.h>
 #include <zlib.h>
 #include <asm/byteorder.h>
 #ifdef CONFIG_HAS_DATAFLASH
 #include <dataflash.h>
 #endif

 /*cmd_boot.c*/
 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);

 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
     defined (CONFIG_CMDLINE_TAG) || \
     defined (CONFIG_INITRD_TAG) || \
     defined (CONFIG_SERIAL_TAG) || \
     defined (CONFIG_REVISION_TAG) || \
     defined (CONFIG_VFD) || \
     defined (CONFIG_LCD)
 static void setup_start_tag (bd_t *bd);

 # ifdef CONFIG_SETUP_MEMORY_TAGS
 static void setup_memory_tags (bd_t *bd);
 # endif
 static void setup_commandline_tag (bd_t *bd, char *commandline);

 #if 0
 static void setup_ramdisk_tag (bd_t *bd);
 #endif
 # ifdef CONFIG_INITRD_TAG
 static void setup_initrd_tag (bd_t *bd, ulong initrd_start,
 			      ulong initrd_end);
 # endif
 static void setup_end_tag (bd_t *bd);

 # if defined (CONFIG_VFD) || defined (CONFIG_LCD)
 static void setup_videolfb_tag (gd_t *gd);
 # endif


 static struct tag *params;
 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */

 #ifdef CONFIG_SHOW_BOOT_PROGRESS
 # include <status_led.h>
 # define SHOW_BOOT_PROGRESS(arg)	show_boot_progress(arg)
 #else
 # define SHOW_BOOT_PROGRESS(arg)
 #endif

 extern image_header_t header;	/* from cmd_bootm.c */


 void do_bootm_linux (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
 		     ulong addr, ulong *len_ptr, int verify)
 {
 	DECLARE_GLOBAL_DATA_PTR;

 	ulong len = 0, checksum;
 	ulong initrd_start, initrd_end;
 	ulong data;
 	void (*theKernel)(int zero, int arch, uint params);
 	image_header_t *hdr = &header;
 	bd_t *bd = gd->bd;

 #ifdef CONFIG_CMDLINE_TAG
 	char *commandline = getenv ("bootargs");
 #endif

 	theKernel = (void (*)(int, int, uint))ntohl(hdr->ih_ep);

 	/*
 	 * Check if there is an initrd image
 	 */
 	if (argc >= 3) {
 		SHOW_BOOT_PROGRESS (9);

 		addr = simple_strtoul (argv[2], NULL, 16);

 		printf ("## Loading Ramdisk Image at %08lx ...\n", addr);

 		/* Copy header so we can blank CRC field for re-calculation */
 #ifdef CONFIG_HAS_DATAFLASH
 		if (addr_dataflash (addr)) {
 			read_dataflash (addr, sizeof (image_header_t),
 					(char *) &header);
 		} else
 #endif
 			memcpy (&header, (char *) addr,
 				sizeof (image_header_t));

 		if (ntohl (hdr->ih_magic) != IH_MAGIC) {
 			printf ("Bad Magic Number\n");
 			SHOW_BOOT_PROGRESS (-10);
 			do_reset (cmdtp, flag, argc, argv);
 		}

 		data = (ulong) & header;
 		len = sizeof (image_header_t);

 		checksum = ntohl (hdr->ih_hcrc);
 		hdr->ih_hcrc = 0;

 		if (crc32 (0, (char *) data, len) != checksum) {
 			printf ("Bad Header Checksum\n");
 			SHOW_BOOT_PROGRESS (-11);
 			do_reset (cmdtp, flag, argc, argv);
 		}

 		SHOW_BOOT_PROGRESS (10);

 		print_image_hdr (hdr);

 		data = addr + sizeof (image_header_t);
 		len = ntohl (hdr->ih_size);

 #ifdef CONFIG_HAS_DATAFLASH
 		if (addr_dataflash (addr)) {
 			read_dataflash (data, len, (char *) CFG_LOAD_ADDR);
 			data = CFG_LOAD_ADDR;
 		}
 #endif

 		if (verify) {
 			ulong csum = 0;

 			printf ("   Verifying Checksum ... ");
 			csum = crc32 (0, (char *) data, len);
 			if (csum != ntohl (hdr->ih_dcrc)) {
 				printf ("Bad Data CRC\n");
 				SHOW_BOOT_PROGRESS (-12);
 				do_reset (cmdtp, flag, argc, argv);
 			}
 			printf ("OK\n");
 		}

 		SHOW_BOOT_PROGRESS (11);

 		if ((hdr->ih_os != IH_OS_LINUX) ||
 		    (hdr->ih_arch != IH_CPU_ARM) ||
 		    (hdr->ih_type != IH_TYPE_RAMDISK)) {
 			printf ("No Linux ARM Ramdisk Image\n");
 			SHOW_BOOT_PROGRESS (-13);
 			do_reset (cmdtp, flag, argc, argv);
 		}

 #if defined(CONFIG_B2) || defined(CONFIG_EVB4510)
 		/*
 		 *we need to copy the ramdisk to SRAM to let Linux boot
 		 */
 		memmove ((void *) ntohl(hdr->ih_load), (uchar *)data, len);
 		data = ntohl(hdr->ih_load);
 #endif /* CONFIG_B2 || CONFIG_EVB4510 */

 		/*
 		 * Now check if we have a multifile image
 		 */
 	} else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
 		ulong tail = ntohl (len_ptr[0]) % 4;
 		int i;

 		SHOW_BOOT_PROGRESS (13);

 		/* skip kernel length and terminator */
 		data = (ulong) (&len_ptr[2]);
 		/* skip any additional image length fields */
 		for (i = 1; len_ptr[i]; ++i)
 			data += 4;
 		/* add kernel length, and align */
 		data += ntohl (len_ptr[0]);
 		if (tail) {
 			data += 4 - tail;
 		}

 		len = ntohl (len_ptr[1]);

 	} else {
 		/*
 		 * no initrd image
 		 */
 		SHOW_BOOT_PROGRESS (14);

 		len = data = 0;
 	}

 #ifdef	DEBUG
 	if (!data) {
 		printf ("No initrd\n");
 	}
 #endif

 	if (data) {
 		initrd_start = data;
 		initrd_end = initrd_start + len;
 	} else {
 		initrd_start = 0;
 		initrd_end = 0;
 	}

 	SHOW_BOOT_PROGRESS (15);

 	debug ("## Transferring control to Linux (at address %08lx) ...\n",
 	       (ulong) theKernel);

 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
     defined (CONFIG_CMDLINE_TAG) || \
     defined (CONFIG_INITRD_TAG) || \
     defined (CONFIG_SERIAL_TAG) || \
     defined (CONFIG_REVISION_TAG) || \
     defined (CONFIG_LCD) || \
     defined (CONFIG_VFD)
 	setup_start_tag (bd);
 #ifdef CONFIG_SERIAL_TAG
 	setup_serial_tag (&params);
 #endif
 #ifdef CONFIG_REVISION_TAG
 	setup_revision_tag (&params);
 #endif
 #ifdef CONFIG_SETUP_MEMORY_TAGS
 	setup_memory_tags (bd);
 #endif
 #ifdef CONFIG_CMDLINE_TAG
 	setup_commandline_tag (bd, commandline);
 #endif
 #ifdef CONFIG_INITRD_TAG
 	if (initrd_start && initrd_end)
 		setup_initrd_tag (bd, initrd_start, initrd_end);
 #endif
 #if defined (CONFIG_VFD) || defined (CONFIG_LCD)
 	setup_videolfb_tag ((gd_t *) gd);
 #endif
 	setup_end_tag (bd);
 #endif

 	/* we assume that the kernel is in place */
 	printf ("\nStarting kernel ...\n\n");

 #ifdef CONFIG_USB_DEVICE
 	{
 		extern void udc_disconnect (void);
 		udc_disconnect ();
 	}
 #endif

 	cleanup_before_linux ();

 	theKernel (0, bd->bi_arch_number, bd->bi_boot_params);
 }


 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
     defined (CONFIG_CMDLINE_TAG) || \
     defined (CONFIG_INITRD_TAG) || \
     defined (CONFIG_SERIAL_TAG) || \
     defined (CONFIG_REVISION_TAG) || \
     defined (CONFIG_LCD) || \
     defined (CONFIG_VFD)
 static void setup_start_tag (bd_t *bd)
 {
 	params = (struct tag *) bd->bi_boot_params;

 	params->hdr.tag = ATAG_CORE;
 	params->hdr.size = tag_size (tag_core);

 	params->u.core.flags = 0;
 	params->u.core.pagesize = 0;
 	params->u.core.rootdev = 0;

 	params = tag_next (params);
 }


 #ifdef CONFIG_SETUP_MEMORY_TAGS
 static void setup_memory_tags (bd_t *bd)
 {
 	int i;

 	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 		params->hdr.tag = ATAG_MEM;
 		params->hdr.size = tag_size (tag_mem32);

 		params->u.mem.start = bd->bi_dram[i].start;
 		params->u.mem.size = bd->bi_dram[i].size;

 		params = tag_next (params);
 	}
 }
 #endif /* CONFIG_SETUP_MEMORY_TAGS */


 static void setup_commandline_tag (bd_t *bd, char *commandline)
 {
 	char *p;

 	if (!commandline)
 		return;

 	/* eat leading white space */
 	for (p = commandline; *p == ' '; p++);

 	/* skip non-existent command lines so the kernel will still
 	 * use its default command line.
 	 */
 	if (*p == '\0')
 		return;

 	params->hdr.tag = ATAG_CMDLINE;
 	params->hdr.size =
 		(sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;

 	strcpy (params->u.cmdline.cmdline, p);

 	params = tag_next (params);
 }


 #ifdef CONFIG_INITRD_TAG
 static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
 {
 	/* an ATAG_INITRD node tells the kernel where the compressed
 	 * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 	 */
 	params->hdr.tag = ATAG_INITRD2;
 	params->hdr.size = tag_size (tag_initrd);

 	params->u.initrd.start = initrd_start;
 	params->u.initrd.size = initrd_end - initrd_start;

 	params = tag_next (params);
 }
 #endif /* CONFIG_INITRD_TAG */


 #if defined (CONFIG_VFD) || defined (CONFIG_LCD)
 extern ulong calc_fbsize (void);
 static void setup_videolfb_tag (gd_t *gd)
 {
 	/* An ATAG_VIDEOLFB node tells the kernel where and how large
 	 * the framebuffer for video was allocated (among other things).
 	 * Note that a _physical_ address is passed !
 	 *
 	 * We only use it to pass the address and size, the other entries
 	 * in the tag_videolfb are not of interest.
 	 */
 	params->hdr.tag = ATAG_VIDEOLFB;
 	params->hdr.size = tag_size (tag_videolfb);

 	params->u.videolfb.lfb_base = (u32) gd->fb_base;
 	/* Fb size is calculated according to parameters for our panel
 	 */
 	params->u.videolfb.lfb_size = calc_fbsize();

 	params = tag_next (params);
 }
 #endif /* CONFIG_VFD || CONFIG_LCD */

 #ifdef CONFIG_SERIAL_TAG
 void setup_serial_tag (struct tag **tmp)
 {
 	struct tag *params = *tmp;
 	struct tag_serialnr serialnr;
 	void get_board_serial(struct tag_serialnr *serialnr);

 	get_board_serial(&serialnr);
 	params->hdr.tag = ATAG_SERIAL;
 	params->hdr.size = tag_size (tag_serialnr);
 	params->u.serialnr.low = serialnr.low;
 	params->u.serialnr.high= serialnr.high;
 	params = tag_next (params);
 	*tmp = params;
 }
 #endif

 #ifdef CONFIG_REVISION_TAG
 void setup_revision_tag(struct tag **in_params)
 {
 	u32 rev = 0;
 	u32 get_board_rev(void);

 	rev = get_board_rev();
 	params->hdr.tag = ATAG_REVISION;
 	params->hdr.size = tag_size (tag_revision);
 	params->u.revision.rev = rev;
 	params = tag_next (params);
 }
 #endif  /* CONFIG_REVISION_TAG */


 static void setup_end_tag (bd_t *bd)
 {
 	params->hdr.tag = ATAG_NONE;
 	params->hdr.size = 0;
 }

 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
	/*
	* (C) Copyright 2002
	* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	* Marius Groeger <mgroeger@sysgo.de>
	*
	* Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
	*
	* 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>
	#include <image.h>
	#include <zlib.h>
	#include <asm/byteorder.h>
	#ifdef CONFIG_HAS_DATAFLASH
	#include <dataflash.h>
	#endif

	/cmd_boot.c/
	extern int do_reset (cmd_tbl_t cmdtp, int flag, int argc, char argv[]);

	#if defined (CONFIG_SETUP_MEMORY_TAGS) \|\| \
	defined (CONFIG_CMDLINE_TAG) \|\| \
	defined (CONFIG_INITRD_TAG) \|\| \
	defined (CONFIG_SERIAL_TAG) \|\| \
	defined (CONFIG_REVISION_TAG) \|\| \
	defined (CONFIG_VFD) \|\| \
	defined (CONFIG_LCD)
	static void setup_start_tag (bd_t *bd);

	# ifdef CONFIG_SETUP_MEMORY_TAGS
	static void setup_memory_tags (bd_t *bd);
	# endif
	static void setup_commandline_tag (bd_t bd, char commandline);

	#if 0
	static void setup_ramdisk_tag (bd_t *bd);
	#endif
	# ifdef CONFIG_INITRD_TAG
	static void setup_initrd_tag (bd_t *bd, ulong initrd_start,
	ulong initrd_end);
	# endif
	static void setup_end_tag (bd_t *bd);

	# if defined (CONFIG_VFD) \|\| defined (CONFIG_LCD)
	static void setup_videolfb_tag (gd_t *gd);
	# endif


	static struct tag *params;
	#endif /* CONFIG_SETUP_MEMORY_TAGS \|\| CONFIG_CMDLINE_TAG \|\| CONFIG_INITRD_TAG */

	#ifdef CONFIG_SHOW_BOOT_PROGRESS
	# include <status_led.h>
	# define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg)
	#else
	# define SHOW_BOOT_PROGRESS(arg)
	#endif

	extern image_header_t header; /* from cmd_bootm.c */


	void do_bootm_linux (cmd_tbl_t cmdtp, int flag, int argc, char argv[],
	ulong addr, ulong *len_ptr, int verify)
	{
	DECLARE_GLOBAL_DATA_PTR;

	ulong len = 0, checksum;
	ulong initrd_start, initrd_end;
	ulong data;
	void (*theKernel)(int zero, int arch, uint params);
	image_header_t *hdr = &header;
	bd_t *bd = gd->bd;

	#ifdef CONFIG_CMDLINE_TAG
	char *commandline = getenv ("bootargs");
	#endif

	theKernel = (void (*)(int, int, uint))ntohl(hdr->ih_ep);

	/*
	* Check if there is an initrd image
	*/
	if (argc >= 3) {
	SHOW_BOOT_PROGRESS (9);

	addr = simple_strtoul (argv[2], NULL, 16);

	printf ("## Loading Ramdisk Image at %08lx ...\n", addr);

	/* Copy header so we can blank CRC field for re-calculation */
	#ifdef CONFIG_HAS_DATAFLASH
	if (addr_dataflash (addr)) {
	read_dataflash (addr, sizeof (image_header_t),
	(char *) &header);
	} else
	#endif
	memcpy (&header, (char *) addr,
	sizeof (image_header_t));

	if (ntohl (hdr->ih_magic) != IH_MAGIC) {
	printf ("Bad Magic Number\n");
	SHOW_BOOT_PROGRESS (-10);
	do_reset (cmdtp, flag, argc, argv);
	}

	data = (ulong) & header;
	len = sizeof (image_header_t);

	checksum = ntohl (hdr->ih_hcrc);
	hdr->ih_hcrc = 0;

	if (crc32 (0, (char *) data, len) != checksum) {
	printf ("Bad Header Checksum\n");
	SHOW_BOOT_PROGRESS (-11);
	do_reset (cmdtp, flag, argc, argv);
	}

	SHOW_BOOT_PROGRESS (10);

	print_image_hdr (hdr);

	data = addr + sizeof (image_header_t);
	len = ntohl (hdr->ih_size);

	#ifdef CONFIG_HAS_DATAFLASH
	if (addr_dataflash (addr)) {
	read_dataflash (data, len, (char *) CFG_LOAD_ADDR);
	data = CFG_LOAD_ADDR;
	}
	#endif

	if (verify) {
	ulong csum = 0;

	printf (" Verifying Checksum ... ");
	csum = crc32 (0, (char *) data, len);
	if (csum != ntohl (hdr->ih_dcrc)) {
	printf ("Bad Data CRC\n");
	SHOW_BOOT_PROGRESS (-12);
	do_reset (cmdtp, flag, argc, argv);
	}
	printf ("OK\n");
	}

	SHOW_BOOT_PROGRESS (11);

	if ((hdr->ih_os != IH_OS_LINUX) \|\|
	(hdr->ih_arch != IH_CPU_ARM) \|\|
	(hdr->ih_type != IH_TYPE_RAMDISK)) {
	printf ("No Linux ARM Ramdisk Image\n");
	SHOW_BOOT_PROGRESS (-13);
	do_reset (cmdtp, flag, argc, argv);
	}

	#if defined(CONFIG_B2) \|\| defined(CONFIG_EVB4510)
	/*
	*we need to copy the ramdisk to SRAM to let Linux boot
	*/
	memmove ((void ) ntohl(hdr->ih_load), (uchar )data, len);
	data = ntohl(hdr->ih_load);
	#endif /* CONFIG_B2 \|\| CONFIG_EVB4510 */

	/*
	* Now check if we have a multifile image
	*/
	} else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
	ulong tail = ntohl (len_ptr[0]) % 4;
	int i;

	SHOW_BOOT_PROGRESS (13);

	/* skip kernel length and terminator */
	data = (ulong) (&len_ptr[2]);
	/* skip any additional image length fields */
	for (i = 1; len_ptr[i]; ++i)
	data += 4;
	/* add kernel length, and align */
	data += ntohl (len_ptr[0]);
	if (tail) {
	data += 4 - tail;
	}

	len = ntohl (len_ptr[1]);

	} else {
	/*
	* no initrd image
	*/
	SHOW_BOOT_PROGRESS (14);

	len = data = 0;
	}

	#ifdef DEBUG
	if (!data) {
	printf ("No initrd\n");
	}
	#endif

	if (data) {
	initrd_start = data;
	initrd_end = initrd_start + len;
	} else {
	initrd_start = 0;
	initrd_end = 0;
	}

	SHOW_BOOT_PROGRESS (15);

	debug ("## Transferring control to Linux (at address %08lx) ...\n",
	(ulong) theKernel);

	#if defined (CONFIG_SETUP_MEMORY_TAGS) \|\| \
	defined (CONFIG_CMDLINE_TAG) \|\| \
	defined (CONFIG_INITRD_TAG) \|\| \
	defined (CONFIG_SERIAL_TAG) \|\| \
	defined (CONFIG_REVISION_TAG) \|\| \
	defined (CONFIG_LCD) \|\| \
	defined (CONFIG_VFD)
	setup_start_tag (bd);
	#ifdef CONFIG_SERIAL_TAG
	setup_serial_tag (&params);
	#endif
	#ifdef CONFIG_REVISION_TAG
	setup_revision_tag (&params);
	#endif
	#ifdef CONFIG_SETUP_MEMORY_TAGS
	setup_memory_tags (bd);
	#endif
	#ifdef CONFIG_CMDLINE_TAG
	setup_commandline_tag (bd, commandline);
	#endif
	#ifdef CONFIG_INITRD_TAG
	if (initrd_start && initrd_end)
	setup_initrd_tag (bd, initrd_start, initrd_end);
	#endif
	#if defined (CONFIG_VFD) \|\| defined (CONFIG_LCD)
	setup_videolfb_tag ((gd_t *) gd);
	#endif
	setup_end_tag (bd);
	#endif

	/* we assume that the kernel is in place */
	printf ("\nStarting kernel ...\n\n");

	#ifdef CONFIG_USB_DEVICE
	{
	extern void udc_disconnect (void);
	udc_disconnect ();
	}
	#endif

	cleanup_before_linux ();

	theKernel (0, bd->bi_arch_number, bd->bi_boot_params);
	}


	#if defined (CONFIG_SETUP_MEMORY_TAGS) \|\| \
	defined (CONFIG_CMDLINE_TAG) \|\| \
	defined (CONFIG_INITRD_TAG) \|\| \
	defined (CONFIG_SERIAL_TAG) \|\| \
	defined (CONFIG_REVISION_TAG) \|\| \
	defined (CONFIG_LCD) \|\| \
	defined (CONFIG_VFD)
	static void setup_start_tag (bd_t *bd)
	{
	params = (struct tag *) bd->bi_boot_params;

	params->hdr.tag = ATAG_CORE;
	params->hdr.size = tag_size (tag_core);

	params->u.core.flags = 0;
	params->u.core.pagesize = 0;
	params->u.core.rootdev = 0;

	params = tag_next (params);
	}


	#ifdef CONFIG_SETUP_MEMORY_TAGS
	static void setup_memory_tags (bd_t *bd)
	{
	int i;

	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
	params->hdr.tag = ATAG_MEM;
	params->hdr.size = tag_size (tag_mem32);

	params->u.mem.start = bd->bi_dram[i].start;
	params->u.mem.size = bd->bi_dram[i].size;

	params = tag_next (params);
	}
	}
	#endif /* CONFIG_SETUP_MEMORY_TAGS */


	static void setup_commandline_tag (bd_t bd, char commandline)
	{
	char *p;

	if (!commandline)
	return;

	/* eat leading white space */
	for (p = commandline; *p == ' '; p++);

	/* skip non-existent command lines so the kernel will still
	* use its default command line.
	*/
	if (*p == '\0')
	return;

	params->hdr.tag = ATAG_CMDLINE;
	params->hdr.size =
	(sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;

	strcpy (params->u.cmdline.cmdline, p);

	params = tag_next (params);
	}


	#ifdef CONFIG_INITRD_TAG
	static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
	{
	/* an ATAG_INITRD node tells the kernel where the compressed
	* ramdisk can be found. ATAG_RDIMG is a better name, actually.
	*/
	params->hdr.tag = ATAG_INITRD2;
	params->hdr.size = tag_size (tag_initrd);

	params->u.initrd.start = initrd_start;
	params->u.initrd.size = initrd_end - initrd_start;

	params = tag_next (params);
	}
	#endif /* CONFIG_INITRD_TAG */


	#if defined (CONFIG_VFD) \|\| defined (CONFIG_LCD)
	extern ulong calc_fbsize (void);
	static void setup_videolfb_tag (gd_t *gd)
	{
	/* An ATAG_VIDEOLFB node tells the kernel where and how large
	* the framebuffer for video was allocated (among other things).
	* Note that a _physical_ address is passed !
	*
	* We only use it to pass the address and size, the other entries
	* in the tag_videolfb are not of interest.
	*/
	params->hdr.tag = ATAG_VIDEOLFB;
	params->hdr.size = tag_size (tag_videolfb);

	params->u.videolfb.lfb_base = (u32) gd->fb_base;
	/* Fb size is calculated according to parameters for our panel
	*/
	params->u.videolfb.lfb_size = calc_fbsize();

	params = tag_next (params);
	}
	#endif /* CONFIG_VFD \|\| CONFIG_LCD */

	#ifdef CONFIG_SERIAL_TAG
	void setup_serial_tag (struct tag **tmp)
	{
	struct tag params = tmp;
	struct tag_serialnr serialnr;
	void get_board_serial(struct tag_serialnr *serialnr);

	get_board_serial(&serialnr);
	params->hdr.tag = ATAG_SERIAL;
	params->hdr.size = tag_size (tag_serialnr);
	params->u.serialnr.low = serialnr.low;
	params->u.serialnr.high= serialnr.high;
	params = tag_next (params);
	*tmp = params;
	}
	#endif

	#ifdef CONFIG_REVISION_TAG
	void setup_revision_tag(struct tag **in_params)
	{
	u32 rev = 0;
	u32 get_board_rev(void);

	rev = get_board_rev();
	params->hdr.tag = ATAG_REVISION;
	params->hdr.size = tag_size (tag_revision);
	params->u.revision.rev = rev;
	params = tag_next (params);
	}
	#endif /* CONFIG_REVISION_TAG */


	static void setup_end_tag (bd_t *bd)
	{
	params->hdr.tag = ATAG_NONE;
	params->hdr.size = 0;
	}

	#endif /* CONFIG_SETUP_MEMORY_TAGS \|\| CONFIG_CMDLINE_TAG \|\| CONFIG_INITRD_TAG */