Initial revision

1 files changed, 931 insertions, 0 deletions

diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
new file mode 100644
index 0000000000..e8ce40d69c
--- /dev/null
+++ b/common/cmd_bootm.c
@@ -0,0 +1,931 @@
+/*
+ * (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
+ */
+
+/*
+ * Boot support
+ */
+#include <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <cmd_boot.h>
+#include <image.h>
+#include <malloc.h>
+#include <zlib.h>
+#include <asm/byteorder.h>
+#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
+
+/*
+ * 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 *, int *);
+
+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
+static void print_type (image_header_t *hdr);
+
+/*
+ *  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' */
+
+#ifndef CONFIG_ARM
+static boot_os_Fcn do_bootm_linux;
+#else
+extern boot_os_Fcn do_bootm_linux;
+#endif
+static boot_os_Fcn do_bootm_netbsd;
+#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 */
+
+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;
+	int	i, verify;
+	char	*name, *s;
+	int	(*appl)(cmd_tbl_t *, int, 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 */
+	memmove (&header, (char *)addr, sizeof(image_header_t));
+
+	if (ntohl(hdr->ih_magic) != IH_MAGIC) {
+		printf ("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, (char *)data, len) != checksum) {
+		printf ("Bad Header Checksum\n");
+		SHOW_BOOT_PROGRESS (-2);
+		return 1;
+	}
+	SHOW_BOOT_PROGRESS (3);
+
+	/* 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) {
+		printf ("   Verifying Checksum ... ");
+		if (crc32 (0, (char *)data, len) != ntohl(hdr->ih_dcrc)) {
+			printf ("Bad Data CRC\n");
+			SHOW_BOOT_PROGRESS (-3);
+			return 1;
+		}
+		printf ("OK\n");
+	}
+	SHOW_BOOT_PROGRESS (4);
+
+	len_ptr = (ulong *)data;
+
+	if (hdr->ih_arch != IH_CPU_PPC && hdr->ih_arch != IH_CPU_ARM) {
+		printf ("Unsupported Architecture\n");
+		SHOW_BOOT_PROGRESS (-4);
+		return 1;
+	}
+	SHOW_BOOT_PROGRESS (5);
+
+	switch (hdr->ih_type) {
+	case IH_TYPE_STANDALONE:	name = "Standalone Application";
+					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();
+
+	switch (hdr->ih_comp) {
+	case IH_COMP_NONE:
+		if(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), 0x400000,
+			    (uchar *)data, (int *)&len) != 0) {
+			printf ("GUNZIP ERROR - must RESET board to recover\n");
+			SHOW_BOOT_PROGRESS (-6);
+			do_reset (cmdtp, flag, argc, argv);
+		}
+		break;
+	default:
+		if (iflag)
+			enable_interrupts();
+		printf ("Unimplemented compression type %d\n", hdr->ih_comp);
+		SHOW_BOOT_PROGRESS (-7);
+		return 1;
+	}
+	printf ("OK\n");
+	SHOW_BOOT_PROGRESS (7);
+
+	switch (hdr->ih_type) {
+	case IH_TYPE_STANDALONE:
+		appl = (int (*)(cmd_tbl_t *, int, int, char *[]))ntohl(hdr->ih_ep);
+		if (iflag)
+			enable_interrupts();
+
+		(*appl)(cmdtp, flag, argc-1, &argv[1]);
+		break;
+	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:
+	    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;
+#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 */
+	}
+
+	SHOW_BOOT_PROGRESS (-9);
+#ifdef DEBUG
+	printf ("\n## Control returned to monitor - resetting...\n");
+	do_reset (cmdtp, flag, argc, argv);
+#endif
+	return 1;
+}
+
+#ifndef CONFIG_ARM
+static 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	sp;
+	ulong	len, checksum;
+	ulong	initrd_start, initrd_end;
+	ulong	cmd_start, cmd_end;
+	ulong	initrd_high;
+	ulong	data;
+	char    *cmdline;
+	char	*s;
+	bd_t	*kbd;
+	void	(*kernel)(bd_t *, ulong, ulong, ulong, ulong);
+	image_header_t *hdr = &header;
+
+	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);
+	} else {			/* not set, no restrictions to load high */
+		initrd_high = ~0;
+	}
+
+	/*
+	 * 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) : );
+
+#ifdef	DEBUG
+	printf ("## Current stack ends at 0x%08lX ", sp);
+#endif
+	sp -= 2048;		/* just to be sure */
+	if (sp > CFG_BOOTMAPSZ)
+		sp = CFG_BOOTMAPSZ;
+	sp &= ~0xF;
+
+#ifdef	DEBUG
+	printf ("=> set upper limit to 0x%08lX\n", sp);
+#endif
+	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_8260)
+		kbd->bi_cpmfreq /= 1000000L;
+		kbd->bi_brgfreq /= 1000000L;
+		kbd->bi_sccfreq /= 1000000L;
+		kbd->bi_vco     /= 1000000L;
+#endif /* CONFIG_8260 */
+	}
+
+	kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))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 */
+		memmove (&header, (char *)addr, sizeof(image_header_t));
+
+		if (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 = 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  = 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 */
+
+			printf ("   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, (char *)cdata, chunk);
+				cdata += chunk;
+
+				WATCHDOG_RESET();
+			}
+#else	/* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
+			csum = crc32 (0, (char *)data, len);
+#endif	/* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
+
+			if (csum != 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_PPC)	||
+		    (hdr->ih_type != IH_TYPE_RAMDISK)	) {
+			printf ("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	DEBUG
+	if (!data) {
+		printf ("No initrd\n");
+	}
+#endif
+
+	if (data) {
+		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);
+#ifdef	DEBUG
+		printf ("## initrd at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
+			data, data + len - 1, len, len);
+#endif
+		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 */
+		printf ("OK\n");
+	} else {
+		initrd_start = 0;
+		initrd_end = 0;
+	}
+
+#ifdef DEBUG
+	printf ("## Transferring control to Linux (at address %08lx) ...\n",
+		(ulong)kernel);
+#endif
+	SHOW_BOOT_PROGRESS (15);
+
+#ifdef CFG_INIT_RAM_LOCK
+	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);
+}
+#endif /* CONFIG_ARM */
+
+static void
+do_bootm_netbsd (cmd_tbl_t *cmdtp, int flag,
+		int	argc, char *argv[],
+		ulong	addr,
+		ulong	*len_ptr,
+		int	verify)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	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 *)) 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
+	 *   r4: image address
+	 *   r5: console device
+	 *   r6: boot args string
+	 */
+	(*loader) (gd->bd, img_addr, consdev, cmdline);
+}
+
+#if (CONFIG_COMMANDS & CFG_CMD_BOOTD)
+int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	int rcode = 0;
+#ifndef CFG_HUSH_PARSER
+	if (run_command (getenv ("bootcmd"), flag) < 0) rcode = 1;
+#else
+	if (parse_string_outer(getenv("bootcmd"),
+		FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP) != 0 ) rcode = 1;
+#endif
+	return rcode;
+}
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_IMI)
+int do_iminfo ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	int	arg;
+	ulong	addr;
+	int     rcode=0;
+
+	if (argc < 2) {
+		return image_info (load_addr);
+	}
+
+	for (arg=1; arg <argc; ++arg) {
+		addr = simple_strtoul(argv[arg], NULL, 16);
+		if (image_info (addr) != 0) rcode = 1;
+	}
+	return rcode;
+}
+
+static int image_info (ulong addr)
+{
+	ulong	data, len, checksum;
+	image_header_t *hdr = &header;
+
+	printf ("\n## Checking 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) {
+		printf ("   Bad Magic Number\n");
+		return 1;
+	}
+
+	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");
+		return 1;
+	}
+
+	/* 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);
+
+	printf ("   Verifying Checksum ... ");
+	if (crc32 (0, (char *)data, len) != ntohl(hdr->ih_dcrc)) {
+		printf ("   Bad Data CRC\n");
+		return 1;
+	}
+	printf ("OK\n");
+	return 0;
+}
+#endif	/* CFG_CMD_IMI */
+
+void
+print_image_hdr (image_header_t *hdr)
+{
+#if (CONFIG_COMMANDS & CFG_CMD_DATE) || defined(CONFIG_TIMESTAMP)
+	time_t timestamp = (time_t)ntohl(hdr->ih_time);
+	struct rtc_time tm;
+#endif
+
+	printf ("   Image Name:   %.*s\n", IH_NMLEN, hdr->ih_name);
+#if (CONFIG_COMMANDS & CFG_CMD_DATE) || defined(CONFIG_TIMESTAMP)
+	to_tm (timestamp, &tm);
+	printf ("   Created:      %4d-%02d-%02d  %2d:%02d:%02d UTC\n",
+		tm.tm_year, tm.tm_mon, tm.tm_mday,
+		tm.tm_hour, tm.tm_min, tm.tm_sec);
+#endif	/* CFG_CMD_DATE, CONFIG_TIMESTAMP */
+	printf ("   Image Type:   "); print_type(hdr); printf ("\n");
+	printf ("   Data Size:    %d Bytes = ", ntohl(hdr->ih_size));
+	print_size (ntohl(hdr->ih_size), "\n");
+	printf ("   Load Address: %08x\n", ntohl(hdr->ih_load));
+	printf ("   Entry Point:  %08x\n", ntohl(hdr->ih_ep));
+
+	if (hdr->ih_type == IH_TYPE_MULTI) {
+		int i;
+		ulong len;
+		ulong *len_ptr = (ulong *)((ulong)hdr + sizeof(image_header_t));
+
+		printf ("   Contents:\n");
+		for (i=0; (len = ntohl(*len_ptr)); ++i, ++len_ptr) {
+			printf ("   Image %d: %8ld Bytes = ", i, len);
+			print_size (len, "\n");
+		}
+	}
+}
+
+
+static void
+print_type (image_header_t *hdr)
+{
+	char *os, *arch, *type, *comp;
+
+	switch (hdr->ih_os) {
+	case IH_OS_INVALID:	os = "Invalid OS";		break;
+	case IH_OS_NETBSD:	os = "NetBSD";			break;
+	case IH_OS_LINUX:	os = "Linux";			break;
+	case IH_OS_VXWORKS:	os = "VxWorks";			break;
+	case IH_OS_QNX:		os = "QNX";			break;
+	case IH_OS_U_BOOT:	os = "U-Boot";			break;
+	default:		os = "Unknown OS";		break;
+	}
+
+	switch (hdr->ih_arch) {
+	case IH_CPU_INVALID:	arch = "Invalid CPU";		break;
+	case IH_CPU_ALPHA:	arch = "Alpha";			break;
+	case IH_CPU_ARM:	arch = "ARM";			break;
+	case IH_CPU_I386:	arch = "Intel x86";		break;
+	case IH_CPU_IA64:	arch = "IA64";			break;
+	case IH_CPU_MIPS:	arch = "MIPS";			break;
+	case IH_CPU_MIPS64:	arch = "MIPS 64 Bit";		break;
+	case IH_CPU_PPC:	arch = "PowerPC";		break;
+	case IH_CPU_S390:	arch = "IBM S390";		break;
+	case IH_CPU_SH:		arch = "SuperH";		break;
+	case IH_CPU_SPARC:	arch = "SPARC";			break;
+	case IH_CPU_SPARC64:	arch = "SPARC 64 Bit";		break;
+	default:		arch = "Unknown Architecture";	break;
+	}
+
+	switch (hdr->ih_type) {
+	case IH_TYPE_INVALID:	type = "Invalid Image";		break;
+	case IH_TYPE_STANDALONE:type = "Standalone Program";	break;
+	case IH_TYPE_KERNEL:	type = "Kernel Image";		break;
+	case IH_TYPE_RAMDISK:	type = "RAMDisk Image";		break;
+	case IH_TYPE_MULTI:	type = "Multi-File Image";	break;
+	case IH_TYPE_FIRMWARE:	type = "Firmware";		break;
+	case IH_TYPE_SCRIPT:	type = "Script";		break;
+	default:		type = "Unknown Image";		break;
+	}
+
+	switch (hdr->ih_comp) {
+	case IH_COMP_NONE:	comp = "uncompressed";		break;
+	case IH_COMP_GZIP:	comp = "gzip compressed";	break;
+	case IH_COMP_BZIP2:	comp = "bzip2 compressed";	break;
+	default:		comp = "unknown compression";	break;
+	}
+
+	printf ("%s %s %s (%s)", arch, os, type, comp);
+}
+
+#define	ZALLOC_ALIGNMENT	16
+
+static void *zalloc(void *x, unsigned items, unsigned size)
+{
+	void *p;
+
+	size *= items;
+	size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
+
+	p = malloc (size);
+
+	return (p);
+}
+
+static void zfree(void *x, void *addr, unsigned nb)
+{
+	free (addr);
+}
+
+#define HEAD_CRC	2
+#define EXTRA_FIELD	4
+#define ORIG_NAME	8
+#define COMMENT		0x10
+#define RESERVED	0xe0
+
+#define DEFLATED	8
+
+int gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
+{
+	z_stream s;
+	int r, i, flags;
+
+	/* skip header */
+	i = 10;
+	flags = src[3];
+	if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
+		printf ("Error: Bad gzipped data\n");
+		return (-1);
+	}
+	if ((flags & EXTRA_FIELD) != 0)
+		i = 12 + src[10] + (src[11] << 8);
+	if ((flags & ORIG_NAME) != 0)
+		while (src[i++] != 0)
+			;
+	if ((flags & COMMENT) != 0)
+		while (src[i++] != 0)
+			;
+	if ((flags & HEAD_CRC) != 0)
+		i += 2;
+	if (i >= *lenp) {
+		printf ("Error: gunzip out of data in header\n");
+		return (-1);
+	}
+
+	s.zalloc = zalloc;
+	s.zfree = zfree;
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	s.outcb = (cb_func)WATCHDOG_RESET;
+#else
+	s.outcb = Z_NULL;
+#endif	/* CONFIG_HW_WATCHDOG */
+
+	r = inflateInit2(&s, -MAX_WBITS);
+	if (r != Z_OK) {
+		printf ("Error: inflateInit2() returned %d\n", r);
+		return (-1);
+	}
+	s.next_in = src + i;
+	s.avail_in = *lenp - i;
+	s.next_out = dst;
+	s.avail_out = dstlen;
+	r = inflate(&s, Z_FINISH);
+	if (r != Z_OK && r != Z_STREAM_END) {
+		printf ("Error: inflate() returned %d\n", r);
+		return (-1);
+	}
+	*lenp = s.next_out - (unsigned char *) dst;
+	inflateEnd(&s);
+
+	return (0);
+}
+
+#if (CONFIG_COMMANDS & CFG_CMD_ELF)
+static void
+do_bootm_vxworks (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
+		  ulong addr, ulong *len_ptr, int verify)
+{
+	image_header_t *hdr = &header;
+	char str[80];
+
+	sprintf(str, "%x", hdr->ih_ep); /* write entry-point into string */
+	setenv("loadaddr", str);
+	do_bootvx(cmdtp, 0, 0, NULL);
+}
+
+static void
+do_bootm_qnxelf (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
+		 ulong addr, ulong *len_ptr, int verify)
+{
+	image_header_t *hdr = &header;
+	char *local_args[2];
+	char str[16];
+
+	sprintf(str, "%x", hdr->ih_ep); /* write entry-point into string */
+	local_args[0] = argv[0];
+	local_args[1] = str;	/* and provide it via the arguments */
+	do_bootelf(cmdtp, 0, 2, local_args);
+}
+#endif /* CFG_CMD_ELF */