cmd_bootm.c

/*
 * (C) Copyright 2000-2006
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * Boot support
 */
#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <image.h>
#include <malloc.h>
#include <zlib.h>
#include <bzlib.h>
#include <environment.h>
#include <asm/byteorder.h>

#ifdef CONFIG_OF_FLAT_TREE
#include <ft_build.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

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

#if (CONFIG_COMMANDS & CFG_CMD_DATE) || defined(CONFIG_TIMESTAMP)
#include <rtc.h>
#endif

#ifdef CFG_HUSH_PARSER
#include <hush.h>
#endif

#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

#ifdef CFG_INIT_RAM_LOCK
#include <asm/cache.h>
#endif

#ifdef CONFIG_LOGBUFFER
#include <logbuff.h>
#endif

#ifdef CONFIG_HAS_DATAFLASH
#include <dataflash.h>
#endif

/*
 * Some systems (for example LWMON) have very short watchdog periods;
 * we must make sure to split long operations like memmove() or
 * crc32() into reasonable chunks.
 */
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
# define CHUNKSZ (64 * 1024)
#endif

int  gunzip (void *, int, unsigned char *, unsigned long *);

static void *zalloc(void *, unsigned, unsigned);
static void zfree(void *, void *, unsigned);

#if (CONFIG_COMMANDS & CFG_CMD_IMI)
static int image_info (unsigned long addr);
#endif

#if (CONFIG_COMMANDS & CFG_CMD_IMLS)
#include <flash.h>
extern flash_info_t flash_info[]; /* info for FLASH chips */
static int do_imls (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
#endif

static void print_type (image_header_t *hdr);

#ifdef __I386__
image_header_t *fake_header(image_header_t *hdr, void *ptr, int size);
#endif

/*
 *  Continue booting an OS image; caller already has:
 *  - copied image header to global variable `header'
 *  - checked header magic number, checksums (both header & image),
 *  - verified image architecture (PPC) and type (KERNEL or MULTI),
 *  - loaded (first part of) image to header load address,
 *  - disabled interrupts.
 */
typedef void boot_os_Fcn (cmd_tbl_t *cmdtp, int flag,
			  int	argc, char *argv[],
			  ulong	addr,		/* of image to boot */
			  ulong	*len_ptr,	/* multi-file image length table */
			  int	verify);	/* getenv("verify")[0] != 'n' */

#ifdef	DEBUG
extern int do_bdinfo ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
#endif

#ifdef CONFIG_PPC
static boot_os_Fcn do_bootm_linux;
#else
extern boot_os_Fcn do_bootm_linux;
#endif
#ifdef CONFIG_SILENT_CONSOLE
static void fixup_silent_linux (void);
#endif
static boot_os_Fcn do_bootm_netbsd;
static boot_os_Fcn do_bootm_rtems;
#if (CONFIG_COMMANDS & CFG_CMD_ELF)
static boot_os_Fcn do_bootm_vxworks;
static boot_os_Fcn do_bootm_qnxelf;
int do_bootvx ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[] );
int do_bootelf (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[] );
#endif /* CFG_CMD_ELF */
#if defined(CONFIG_ARTOS) && defined(CONFIG_PPC)
static boot_os_Fcn do_bootm_artos;
#endif
#ifdef CONFIG_LYNXKDI
static boot_os_Fcn do_bootm_lynxkdi;
extern void lynxkdi_boot( image_header_t * );
#endif

#ifndef CFG_BOOTM_LEN
#define CFG_BOOTM_LEN	0x800000	/* use 8MByte as default max gunzip size */
#endif

image_header_t header;

ulong load_addr = CFG_LOAD_ADDR;		/* Default Load Address */

int do_bootm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	ulong	iflag;
	ulong	addr;
	ulong	data, len, checksum;
	ulong  *len_ptr;
	uint	unc_len = CFG_BOOTM_LEN;
	int	i, verify;
	char	*name, *s;
	int	(*appl)(int, char *[]);
	image_header_t *hdr = &header;

	s = getenv ("verify");
	verify = (s && (*s == 'n')) ? 0 : 1;

	if (argc < 2) {
		addr = load_addr;
	} else {
		addr = simple_strtoul(argv[1], NULL, 16);
	}

	SHOW_BOOT_PROGRESS (1);
	printf ("## Booting 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
	memmove (&header, (char *)addr, sizeof(image_header_t));

	if (ntohl(hdr->ih_magic) != IH_MAGIC) {
#ifdef __I386__	/* correct image format not implemented yet - fake it */
		if (fake_header(hdr, (void*)addr, -1) != NULL) {
			/* to compensate for the addition below */
			addr -= sizeof(image_header_t);
			/* turnof verify,
			 * fake_header() does not fake the data crc
			 */
			verify = 0;
		} else
#endif	/* __I386__ */
	    {
		puts ("Bad Magic Number\n");
		SHOW_BOOT_PROGRESS (-1);
		return 1;
	    }
	}
	SHOW_BOOT_PROGRESS (2);

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

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

	if (crc32 (0, (uchar *)data, len) != checksum) {
		puts ("Bad Header Checksum\n");
		SHOW_BOOT_PROGRESS (-2);
		return 1;
	}
	SHOW_BOOT_PROGRESS (3);

#ifdef CONFIG_HAS_DATAFLASH
	if (addr_dataflash(addr)){
		len  = ntohl(hdr->ih_size) + sizeof(image_header_t);
		read_dataflash(addr, len, (char *)CFG_LOAD_ADDR);
		addr = CFG_LOAD_ADDR;
	}
#endif


	/* for multi-file images we need the data part, too */
	print_image_hdr ((image_header_t *)addr);

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

	if (verify) {
		puts ("   Verifying Checksum ... ");
		if (crc32 (0, (uchar *)data, len) != ntohl(hdr->ih_dcrc)) {
			printf ("Bad Data CRC\n");
			SHOW_BOOT_PROGRESS (-3);
			return 1;
		}
		puts ("OK\n");
	}
	SHOW_BOOT_PROGRESS (4);

	len_ptr = (ulong *)data;

#if defined(__PPC__)
	if (hdr->ih_arch != IH_CPU_PPC)
#elif defined(__ARM__)
	if (hdr->ih_arch != IH_CPU_ARM)
#elif defined(__I386__)
	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)
#elif defined(__M68K__)
	if (hdr->ih_arch != IH_CPU_M68K)
#elif defined(__microblaze__)
	if (hdr->ih_arch != IH_CPU_MICROBLAZE)
#elif defined(__nios2__)
	if (hdr->ih_arch != IH_CPU_NIOS2)
#elif defined(__blackfin__)
	if (hdr->ih_arch != IH_CPU_BLACKFIN)
#elif defined(__avr32__)
	if (hdr->ih_arch != IH_CPU_AVR32)
#else
# error Unknown CPU type
#endif
	{
		printf ("Unsupported Architecture 0x%x\n", hdr->ih_arch);
		SHOW_BOOT_PROGRESS (-4);
		return 1;
	}
	SHOW_BOOT_PROGRESS (5);

	switch (hdr->ih_type) {
	case IH_TYPE_STANDALONE:
		name = "Standalone Application";
		/* A second argument overwrites the load address */
		if (argc > 2) {
			hdr->ih_load = htonl(simple_strtoul(argv[2], NULL, 16));
		}
		break;
	case IH_TYPE_KERNEL:
		name = "Kernel Image";
		break;
	case IH_TYPE_MULTI:
		name = "Multi-File Image";
		len  = ntohl(len_ptr[0]);
		/* OS kernel is always the first image */
		data += 8; /* kernel_len + terminator */
		for (i=1; len_ptr[i]; ++i)
			data += 4;
		break;
	default: printf ("Wrong Image Type for %s command\n", cmdtp->name);
		SHOW_BOOT_PROGRESS (-5);
		return 1;
	}
	SHOW_BOOT_PROGRESS (6);

	/*
	 * We have reached the point of no return: we are going to
	 * overwrite all exception vector code, so we cannot easily
	 * recover from any failures any more...
	 */

	iflag = disable_interrupts();

#ifdef CONFIG_AMIGAONEG3SE
	/*
	 * We've possible left the caches enabled during
	 * bios emulation, so turn them off again
	 */
	icache_disable();
	invalidate_l1_instruction_cache();
	flush_data_cache();
	dcache_disable();
#endif

	switch (hdr->ih_comp) {
	case IH_COMP_NONE:
		if(ntohl(hdr->ih_load) == addr) {
			printf ("   XIP %s ... ", name);
		} else {
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
			size_t l = len;
			void *to = (void *)ntohl(hdr->ih_load);
			void *from = (void *)data;

			printf ("   Loading %s ... ", name);

			while (l > 0) {
				size_t tail = (l > CHUNKSZ) ? CHUNKSZ : l;
				WATCHDOG_RESET();
				memmove (to, from, tail);
				to += tail;
				from += tail;
				l -= tail;
			}
#else	/* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
			memmove ((void *) ntohl(hdr->ih_load), (uchar *)data, len);
#endif	/* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
		}
		break;
	case IH_COMP_GZIP:
		printf ("   Uncompressing %s ... ", name);
		if (gunzip ((void *)ntohl(hdr->ih_load), unc_len,
			    (uchar *)data, &len) != 0) {
			puts ("GUNZIP ERROR - must RESET board to recover\n");
			SHOW_BOOT_PROGRESS (-6);
			do_reset (cmdtp, flag, argc, argv);
		}
		break;
#ifdef CONFIG_BZIP2
	case IH_COMP_BZIP2:
		printf ("   Uncompressing %s ... ", name);
		/*
		 * If we've got less than 4 MB of malloc() space,
		 * use slower decompression algorithm which requires
		 * at most 2300 KB of memory.
		 */
		i = BZ2_bzBuffToBuffDecompress ((char*)ntohl(hdr->ih_load),
						&unc_len, (char *)data, len,
						CFG_MALLOC_LEN < (4096 * 1024), 0);
		if (i != BZ_OK) {
			printf ("BUNZIP2 ERROR %d - must RESET board to recover\n", i);
			SHOW_BOOT_PROGRESS (-6);
			udelay(100000);
			do_reset (cmdtp, flag, argc, argv);
		}
		break;
#endif /* CONFIG_BZIP2 */
	default:
		if (iflag)
			enable_interrupts();
		printf ("Unimplemented compression type %d\n", hdr->ih_comp);
		SHOW_BOOT_PROGRESS (-7);
		return 1;
	}
	puts ("OK\n");
	SHOW_BOOT_PROGRESS (7);

	switch (hdr->ih_type) {
	case IH_TYPE_STANDALONE:
		if (iflag)
			enable_interrupts();

		/* load (and uncompress), but don't start if "autostart"
		 * is set to "no"
		 */
		if (((s = getenv("autostart")) != NULL) && (strcmp(s,"no") == 0)) {
			char buf[32];
			sprintf(buf, "%lX", len);
			setenv("filesize", buf);
			return 0;
		}
		appl = (int (*)(int, char *[]))ntohl(hdr->ih_ep);
		(*appl)(argc-1, &argv[1]);
		return 0;
	case IH_TYPE_KERNEL:
	case IH_TYPE_MULTI:
		/* handled below */
		break;
	default:
		if (iflag)
			enable_interrupts();
		printf ("Can't boot image type %d\n", hdr->ih_type);
		SHOW_BOOT_PROGRESS (-8);
		return 1;
	}
	SHOW_BOOT_PROGRESS (8);

	switch (hdr->ih_os) {
	default:			/* handled by (original) Linux case */
	case IH_OS_LINUX:
#ifdef CONFIG_SILENT_CONSOLE
	    fixup_silent_linux();
#endif
	    do_bootm_linux  (cmdtp, flag, argc, argv,
			     addr, len_ptr, verify);
	    break;
	case IH_OS_NETBSD:
	    do_bootm_netbsd (cmdtp, flag, argc, argv,
			     addr, len_ptr, verify);
	    break;

#ifdef CONFIG_LYNXKDI
	case IH_OS_LYNXOS:
	    do_bootm_lynxkdi (cmdtp, flag, argc, argv,
			     addr, len_ptr, verify);
	    break;
#endif

	case IH_OS_RTEMS:
	    do_bootm_rtems (cmdtp, flag, argc, argv,
			     addr, len_ptr, verify);
	    break;

#if (CONFIG_COMMANDS & CFG_CMD_ELF)
	case IH_OS_VXWORKS:
	    do_bootm_vxworks (cmdtp, flag, argc, argv,
			      addr, len_ptr, verify);
	    break;
	case IH_OS_QNX:
	    do_bootm_qnxelf (cmdtp, flag, argc, argv,
			      addr, len_ptr, verify);
	    break;
#endif /* CFG_CMD_ELF */
#ifdef CONFIG_ARTOS
	case IH_OS_ARTOS:
	    do_bootm_artos  (cmdtp, flag, argc, argv,
			     addr, len_ptr, verify);
	    break;
#endif
	}

	SHOW_BOOT_PROGRESS (-9);
#ifdef DEBUG
	puts ("\n## Control returned to monitor - resetting...\n");
	do_reset (cmdtp, flag, argc, argv);
#endif
	return 1;
}

U_BOOT_CMD(
 	bootm,	CFG_MAXARGS,	1,	do_bootm,
 	"bootm   - boot application image from memory\n",
 	"[addr [arg ...]]\n    - boot application image stored in memory\n"
 	"\tpassing arguments 'arg ...'; when booting a Linux kernel,\n"
 	"\t'arg' can be the address of an initrd image\n"
#ifdef CONFIG_OF_FLAT_TREE
	"\tWhen booting a Linux kernel which requires a flat device-tree\n"
	"\ta third argument is required which is the address of the of the\n"
	"\tdevice-tree blob. To boot that kernel without an initrd image,\n"
	"\tuse a '-' for the second argument. If you do not pass a third\n"
	"\ta bd_info struct will be passed instead\n"
#endif
);

#ifdef CONFIG_SILENT_CONSOLE
static void
fixup_silent_linux ()
{
	char buf[256], *start, *end;
	char *cmdline = getenv ("bootargs");

	/* Only fix cmdline when requested */
	if (!(gd->flags & GD_FLG_SILENT))
		return;

	debug ("before silent fix-up: %s\n", cmdline);
	if (cmdline) {
		if ((start = strstr (cmdline, "console=")) != NULL) {
			end = strchr (start, ' ');
			strncpy (buf, cmdline, (start - cmdline + 8));
			if (end)
				strcpy (buf + (start - cmdline + 8), end);
			else
				buf[start - cmdline + 8] = '\0';
		} else {
			strcpy (buf, cmdline);
			strcat (buf, " console=");
		}
	} else {
		strcpy (buf, "console=");
	}

	setenv ("bootargs", buf);
	debug ("after silent fix-up: %s\n", buf);
}
#endif /* CONFIG_SILENT_CONSOLE */

#ifdef CONFIG_PPC
static void  __attribute__((noinline))
do_bootm_linux (cmd_tbl_t *cmdtp, int flag,
		int	argc, char *argv[],
		ulong	addr,
		ulong	*len_ptr,
		int	verify)
{
	ulong	sp;
	ulong	len, checksum;
	ulong	initrd_start, initrd_end;
	ulong	cmd_start, cmd_end;
	ulong	initrd_high;
	ulong	data;
	int	initrd_copy_to_ram = 1;
	char    *cmdline;
	char	*s;
	bd_t	*kbd;
	void	(*kernel)(bd_t *, ulong, ulong, ulong, ulong);
	image_header_t *hdr = &header;
#ifdef CONFIG_OF_FLAT_TREE
	char	*of_flat_tree = NULL;
#endif

	if ((s = getenv ("initrd_high")) != NULL) {
		/* a value of "no" or a similar string will act like 0,
		 * turning the "load high" feature off. This is intentional.
		 */
		initrd_high = simple_strtoul(s, NULL, 16);
		if (initrd_high == ~0)
			initrd_copy_to_ram = 0;
	} else {	/* not set, no restrictions to load high */
		initrd_high = ~0;
	}

#ifdef CONFIG_LOGBUFFER
	kbd=gd->bd;
	/* Prevent initrd from overwriting logbuffer */
	if (initrd_high < (kbd->bi_memsize-LOGBUFF_LEN-LOGBUFF_OVERHEAD))
		initrd_high = kbd->bi_memsize-LOGBUFF_LEN-LOGBUFF_OVERHEAD;
	debug ("## Logbuffer at 0x%08lX ", kbd->bi_memsize-LOGBUFF_LEN);
#endif

	/*
	 * Booting a (Linux) kernel image
	 *
	 * Allocate space for command line and board info - the
	 * address should be as high as possible within the reach of
	 * the kernel (see CFG_BOOTMAPSZ settings), but in unused
	 * memory, which means far enough below the current stack
	 * pointer.
	 */

	asm( "mr %0,1": "=r"(sp) : );

	debug ("## Current stack ends at 0x%08lX ", sp);

	sp -= 2048;		/* just to be sure */
	if (sp > CFG_BOOTMAPSZ)
		sp = CFG_BOOTMAPSZ;
	sp &= ~0xF;

	debug ("=> set upper limit to 0x%08lX\n", sp);

	cmdline = (char *)((sp - CFG_BARGSIZE) & ~0xF);
	kbd = (bd_t *)(((ulong)cmdline - sizeof(bd_t)) & ~0xF);

	if ((s = getenv("bootargs")) == NULL)
		s = "";

	strcpy (cmdline, s);

	cmd_start    = (ulong)&cmdline[0];
	cmd_end      = cmd_start + strlen(cmdline);

	*kbd = *(gd->bd);

#ifdef	DEBUG
	printf ("## cmdline at 0x%08lX ... 0x%08lX\n", cmd_start, cmd_end);

	do_bdinfo (NULL, 0, 0, NULL);
#endif

	if ((s = getenv ("clocks_in_mhz")) != NULL) {
		/* convert all clock information to MHz */
		kbd->bi_intfreq /= 1000000L;
		kbd->bi_busfreq /= 1000000L;
#if defined(CONFIG_MPC8220)
	kbd->bi_inpfreq /= 1000000L;
	kbd->bi_pcifreq /= 1000000L;
	kbd->bi_pevfreq /= 1000000L;
	kbd->bi_flbfreq /= 1000000L;
	kbd->bi_vcofreq /= 1000000L;
#endif
#if defined(CONFIG_CPM2)
		kbd->bi_cpmfreq /= 1000000L;
		kbd->bi_brgfreq /= 1000000L;
		kbd->bi_sccfreq /= 1000000L;
		kbd->bi_vco     /= 1000000L;
#endif
#if defined(CONFIG_MPC5xxx)
		kbd->bi_ipbfreq /= 1000000L;
		kbd->bi_pcifreq /= 1000000L;
#endif /* CONFIG_MPC5xxx */
	}

	kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong)) ntohl(hdr->ih_ep);

	/*
	 * Check if there is an initrd image
	 */

#ifdef CONFIG_OF_FLAT_TREE
	/* Look for a '-' which indicates to ignore the ramdisk argument */
	if (argc >= 3 && strcmp(argv[2], "-") ==  0) {
			debug ("Skipping initrd\n");
			len = data = 0;
		}
	else
#endif
	if (argc >= 3) {
		debug ("Not skipping initrd\n");
		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 */
		memmove (&header, (char *)addr, sizeof(image_header_t));

		if (ntohl(hdr->ih_magic)  != IH_MAGIC) {
			puts ("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, (uchar *)data, len) != checksum) {
			puts ("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);

		if (verify) {
			ulong csum = 0;
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
			ulong cdata = data, edata = cdata + len;
#endif	/* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */

			puts ("   Verifying Checksum ... ");

#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)

			while (cdata < edata) {
				ulong chunk = edata - cdata;

				if (chunk > CHUNKSZ)
					chunk = CHUNKSZ;
				csum = crc32 (csum, (uchar *)cdata, chunk);
				cdata += chunk;

				WATCHDOG_RESET();
			}
#else	/* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
			csum = crc32 (0, (uchar *)data, len);
#endif	/* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */

			if (csum != ntohl(hdr->ih_dcrc)) {
				puts ("Bad Data CRC\n");
				SHOW_BOOT_PROGRESS (-12);
				do_reset (cmdtp, flag, argc, argv);
			}
			puts ("OK\n");
		}

		SHOW_BOOT_PROGRESS (11);

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

		/*
		 * Now check if we have a multifile image
		 */
	} else if ((hdr->ih_type==IH_TYPE_MULTI) && (len_ptr[1])) {
		u_long 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 CONFIG_OF_FLAT_TREE
	if(argc > 3) {
		of_flat_tree = (char *) simple_strtoul(argv[3], NULL, 16);
		hdr = (image_header_t *)of_flat_tree;

		if  (*(ulong *)of_flat_tree == OF_DT_HEADER) {
#ifndef CFG_NO_FLASH
			if (addr2info((ulong)of_flat_tree) != NULL) {
				printf ("Cannot modify flat device tree stored in flash\n" \
					"Copy to memory before using the bootm command\n");
				return;
			}
#endif
		} else if (ntohl(hdr->ih_magic) == IH_MAGIC) {
			printf("## Flat Device Tree Image at %08lX\n", hdr);
			print_image_hdr(hdr);

			if ((ntohl(hdr->ih_load) <  ((unsigned long)hdr + ntohl(hdr->ih_size) + sizeof(hdr))) &&
			   ((ntohl(hdr->ih_load) + ntohl(hdr->ih_size)) > (unsigned long)hdr)) {
				printf ("ERROR: Load address overwrites Flat Device Tree uImage\n");
				return;
			}

			printf("   Verifying Checksum ... ");
			memmove (&header, (char *)hdr, sizeof(image_header_t));
			checksum = ntohl(header.ih_hcrc);
			header.ih_hcrc = 0;

			if(checksum != crc32(0, (uchar *)&header, sizeof(image_header_t))) {
				printf("ERROR: Flat Device Tree header checksum is invalid\n");
				return;
			}

			checksum = ntohl(hdr->ih_dcrc);
			addr = (ulong)((uchar *)(hdr) + sizeof(image_header_t));
			len = ntohl(hdr->ih_size);

			if(checksum != crc32(0, (uchar *)addr, len)) {
				printf("ERROR: Flat Device Tree checksum is invalid\n");
				return;
			}
			printf("OK\n");

			if (ntohl(hdr->ih_type) != IH_TYPE_FLATDT) {
				printf ("ERROR: uImage not Flat Device Tree type\n");
				return;
			}
			if (ntohl(hdr->ih_comp) != IH_COMP_NONE) {
				printf("ERROR: uImage is not uncompressed\n");
				return;
			}
			if (*((ulong *)(of_flat_tree + sizeof(image_header_t))) != OF_DT_HEADER) {
				printf ("ERROR: uImage data is not a flat device tree\n");
				return;
			}

			memmove((void *)ntohl(hdr->ih_load),
		       		(void *)(of_flat_tree + sizeof(image_header_t)),
				ntohl(hdr->ih_size));
			of_flat_tree = (char *)ntohl(hdr->ih_load);
		} else {
			printf ("Did not find a flat flat device tree at address %08lX\n", of_flat_tree);
			return;
		}
		printf ("   Booting using flat device tree at 0x%x\n",
				of_flat_tree);
	} else if(getenv("disable_of") == NULL) {
		printf ("ERROR: bootm needs flat device tree as third argument\n");
		return;
	}
#endif
	if (!data) {
		debug ("No initrd\n");
	}

	if (data) {
	    if (!initrd_copy_to_ram) {	/* zero-copy ramdisk support */
		initrd_start = data;
		initrd_end = initrd_start + len;
	    } else {
		initrd_start  = (ulong)kbd - len;
		initrd_start &= ~(4096 - 1);	/* align on page */

		if (initrd_high) {
			ulong nsp;

			/*
			 * the inital ramdisk does not need to be within
			 * CFG_BOOTMAPSZ as it is not accessed until after
			 * the mm system is initialised.
			 *
			 * do the stack bottom calculation again and see if
			 * the initrd will fit just below the monitor stack
			 * bottom without overwriting the area allocated
			 * above for command line args and board info.
			 */
			asm( "mr %0,1": "=r"(nsp) : );
			nsp -= 2048;		/* just to be sure */
			nsp &= ~0xF;
			if (nsp > initrd_high)	/* limit as specified */
				nsp = initrd_high;
			nsp -= len;
			nsp &= ~(4096 - 1);	/* align on page */
			if (nsp >= sp)
				initrd_start = nsp;
		}

		SHOW_BOOT_PROGRESS (12);

		debug ("## initrd at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
			data, data + len - 1, len, len);

		initrd_end    = initrd_start + len;
		printf ("   Loading Ramdisk to %08lx, end %08lx ... ",
			initrd_start, initrd_end);
#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
		{
			size_t l = len;
			void *to = (void *)initrd_start;
			void *from = (void *)data;

			while (l > 0) {
				size_t tail = (l > CHUNKSZ) ? CHUNKSZ : l;
				WATCHDOG_RESET();
				memmove (to, from, tail);
				to += tail;
				from += tail;
				l -= tail;
			}
		}
#else	/* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
		memmove ((void *)initrd_start, (void *)data, len);
#endif	/* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
		puts ("OK\n");
	    }
	} else {
		initrd_start = 0;
		initrd_end = 0;
	}

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

	SHOW_BOOT_PROGRESS (15);

#ifndef CONFIG_OF_FLAT_TREE

#if defined(CFG_INIT_RAM_LOCK) && !defined(CONFIG_E500)
	unlock_ram_in_cache();
#endif

	/*
	 * Linux Kernel Parameters:
	 *   r3: ptr to board info data
	 *   r4: initrd_start or 0 if no initrd
	 *   r5: initrd_end - unused if r4 is 0
	 *   r6: Start of command line string
	 *   r7: End   of command line string
	 */
	(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);

#else
	ft_setup(of_flat_tree, kbd, initrd_start, initrd_end);
	/* ft_dump_blob(of_flat_tree); */

#if defined(CFG_INIT_RAM_LOCK) && !defined(CONFIG_E500)
	unlock_ram_in_cache();
#endif
	/*
	 * Linux Kernel Parameters:
	 *   r3: ptr to OF flat tree, followed by the board info data
	 *   r4: physical pointer to the kernel itself
	 *   r5: NULL
	 *   r6: NULL
	 *   r7: NULL
	 */
	if (getenv("disable_of") != NULL)
		(*kernel) ((bd_t *)of_flat_tree, initrd_start, initrd_end,
			cmd_start, cmd_end);
	else {
		ft_setup(of_flat_tree, kbd, initrd_start, initrd_end);
		/* ft_dump_blob(of_flat_tree); */
		(*kernel) ((bd_t *)of_flat_tree, (ulong)kernel, 0, 0, 0);
	}
		
#endif
}
#endif /* CONFIG_PPC */

static void
do_bootm_netbsd (cmd_tbl_t *cmdtp, int flag,
		int	argc, char *argv[],
		ulong	addr,
		ulong	*len_ptr,
		int	verify)
{
	image_header_t *hdr = &header;

	void	(*loader)(bd_t *, image_header_t *, char *, char *);
	image_header_t *img_addr;
	char     *consdev;
	char     *cmdline;


	/*
	 * Booting a (NetBSD) kernel image
	 *
	 * This process is pretty similar to a standalone application:
	 * The (first part of an multi-) image must be a stage-2 loader,
	 * which in turn is responsible for loading & invoking the actual
	 * kernel.  The only differences are the parameters being passed:
	 * besides the board info strucure, the loader expects a command
	 * line, the name of the console device, and (optionally) the
	 * address of the original image header.
	 */

	img_addr = 0;
	if ((hdr->ih_type==IH_TYPE_MULTI) && (len_ptr[1]))
		img_addr = (image_header_t *) addr;


	consdev = "";
#if   defined (CONFIG_8xx_CONS_SMC1)
	consdev = "smc1";
#elif defined (CONFIG_8xx_CONS_SMC2)
	consdev = "smc2";
#elif defined (CONFIG_8xx_CONS_SCC2)
	consdev = "scc2";
#elif defined (CONFIG_8xx_CONS_SCC3)
	consdev = "scc3";
#endif

	if (argc > 2) {
		ulong len;
		int   i;

		for (i=2, len=0 ; i<argc ; i+=1)
			len += strlen (argv[i]) + 1;
		cmdline = malloc (len);

		for (i=2, len=0 ; i<argc ; i+=1) {
			if (i > 2)
				cmdline[len++] = ' ';
			strcpy (&cmdline[len], argv[i]);
			len += strlen (argv[i]);
		}
	} else if ((cmdline = getenv("bootargs")) == NULL) {
		cmdline = "";
	}

	loader = (void (*)(bd_t *, image_header_t *, char *, char *)) ntohl(hdr->ih_ep);

	printf ("## Transferring control to NetBSD stage-2 loader (at address %08lx) ...\n",
		(ulong)loader);

	SHOW_BOOT_PROGRESS (15);

	/*
	 * NetBSD Stage-2 Loader Parameters:
	 *   r3: ptr to board info data