common/image-fit.c

/*
 * Copyright (c) 2013, Google Inc.
 *
 * (C) Copyright 2008 Semihalf
 *
 * (C) Copyright 2000-2006
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifdef USE_HOSTCC
#include "mkimage.h"
#include <image.h>
#include <time.h>
#else
#include <common.h>
#include <errno.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
#endif /* !USE_HOSTCC*/

#include <bootstage.h>
#include <sha1.h>
#include <sha256.h>
#include <u-boot/crc.h>
#include <u-boot/md5.h>

/*****************************************************************************/
/* New uImage format routines */
/*****************************************************************************/
#ifndef USE_HOSTCC
static int fit_parse_spec(const char *spec, char sepc, ulong addr_curr,
		ulong *addr, const char **name)
{
	const char *sep;

	*addr = addr_curr;
	*name = NULL;

	sep = strchr(spec, sepc);
	if (sep) {
		if (sep - spec > 0)
			*addr = simple_strtoul(spec, NULL, 16);

		*name = sep + 1;
		return 1;
	}

	return 0;
}

/**
 * fit_parse_conf - parse FIT configuration spec
 * @spec: input string, containing configuration spec
 * @add_curr: current image address (to be used as a possible default)
 * @addr: pointer to a ulong variable, will hold FIT image address of a given
 * configuration
 * @conf_name double pointer to a char, will hold pointer to a configuration
 * unit name
 *
 * fit_parse_conf() expects configuration spec in the form of [<addr>]#<conf>,
 * where <addr> is a FIT image address that contains configuration
 * with a <conf> unit name.
 *
 * Address part is optional, and if omitted default add_curr will
 * be used instead.
 *
 * returns:
 *     1 if spec is a valid configuration string,
 *     addr and conf_name are set accordingly
 *     0 otherwise
 */
int fit_parse_conf(const char *spec, ulong addr_curr,
		ulong *addr, const char **conf_name)
{
	return fit_parse_spec(spec, '#', addr_curr, addr, conf_name);
}

/**
 * fit_parse_subimage - parse FIT subimage spec
 * @spec: input string, containing subimage spec
 * @add_curr: current image address (to be used as a possible default)
 * @addr: pointer to a ulong variable, will hold FIT image address of a given
 * subimage
 * @image_name: double pointer to a char, will hold pointer to a subimage name
 *
 * fit_parse_subimage() expects subimage spec in the form of
 * [<addr>]:<subimage>, where <addr> is a FIT image address that contains
 * subimage with a <subimg> unit name.
 *
 * Address part is optional, and if omitted default add_curr will
 * be used instead.
 *
 * returns:
 *     1 if spec is a valid subimage string,
 *     addr and image_name are set accordingly
 *     0 otherwise
 */
int fit_parse_subimage(const char *spec, ulong addr_curr,
		ulong *addr, const char **image_name)
{
	return fit_parse_spec(spec, ':', addr_curr, addr, image_name);
}
#endif /* !USE_HOSTCC */

static void fit_get_debug(const void *fit, int noffset,
		char *prop_name, int err)
{
	debug("Can't get '%s' property from FIT 0x%08lx, node: offset %d, name %s (%s)\n",
	      prop_name, (ulong)fit, noffset, fit_get_name(fit, noffset, NULL),
	      fdt_strerror(err));
}

#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_FIT_SPL_PRINT)
/**
 * fit_print_contents - prints out the contents of the FIT format image
 * @fit: pointer to the FIT format image header
 * @p: pointer to prefix string
 *
 * fit_print_contents() formats a multi line FIT image contents description.
 * The routine prints out FIT image properties (root node level) follwed by
 * the details of each component image.
 *
 * returns:
 *     no returned results
 */
void fit_print_contents(const void *fit)
{
	char *desc;
	char *uname;
	int images_noffset;
	int confs_noffset;
	int noffset;
	int ndepth;
	int count = 0;
	int ret;
	const char *p;
	time_t timestamp;

	/* Indent string is defined in header image.h */
	p = IMAGE_INDENT_STRING;

	/* Root node properties */
	ret = fit_get_desc(fit, 0, &desc);
	printf("%sFIT description: ", p);
	if (ret)
		printf("unavailable\n");
	else
		printf("%s\n", desc);

	if (IMAGE_ENABLE_TIMESTAMP) {
		ret = fit_get_timestamp(fit, 0, &timestamp);
		printf("%sCreated:         ", p);
		if (ret)
			printf("unavailable\n");
		else
			genimg_print_time(timestamp);
	}

	/* Find images parent node offset */
	images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
	if (images_noffset < 0) {
		printf("Can't find images parent node '%s' (%s)\n",
		       FIT_IMAGES_PATH, fdt_strerror(images_noffset));
		return;
	}

	/* Process its subnodes, print out component images details */
	for (ndepth = 0, count = 0,
		noffset = fdt_next_node(fit, images_noffset, &ndepth);
	     (noffset >= 0) && (ndepth > 0);
	     noffset = fdt_next_node(fit, noffset, &ndepth)) {
		if (ndepth == 1) {
			/*
			 * Direct child node of the images parent node,
			 * i.e. component image node.
			 */
			printf("%s Image %u (%s)\n", p, count++,
			       fit_get_name(fit, noffset, NULL));

			fit_image_print(fit, noffset, p);
		}
	}

	/* Find configurations parent node offset */
	confs_noffset = fdt_path_offset(fit, FIT_CONFS_PATH);
	if (confs_noffset < 0) {
		debug("Can't get configurations parent node '%s' (%s)\n",
		      FIT_CONFS_PATH, fdt_strerror(confs_noffset));
		return;
	}

	/* get default configuration unit name from default property */
	uname = (char *)fdt_getprop(fit, noffset, FIT_DEFAULT_PROP, NULL);
	if (uname)
		printf("%s Default Configuration: '%s'\n", p, uname);

	/* Process its subnodes, print out configurations details */
	for (ndepth = 0, count = 0,
		noffset = fdt_next_node(fit, confs_noffset, &ndepth);
	     (noffset >= 0) && (ndepth > 0);
	     noffset = fdt_next_node(fit, noffset, &ndepth)) {
		if (ndepth == 1) {
			/*
			 * Direct child node of the configurations parent node,
			 * i.e. configuration node.
			 */
			printf("%s Configuration %u (%s)\n", p, count++,
			       fit_get_name(fit, noffset, NULL));

			fit_conf_print(fit, noffset, p);
		}
	}
}

/**
 * fit_image_print_data() - prints out the hash node details
 * @fit: pointer to the FIT format image header
 * @noffset: offset of the hash node
 * @p: pointer to prefix string
 * @type: Type of information to print ("hash" or "sign")
 *
 * fit_image_print_data() lists properies for the processed hash node
 *
 * This function avoid using puts() since it prints a newline on the host
 * but does not in U-Boot.
 *
 * returns:
 *     no returned results
 */
static void fit_image_print_data(const void *fit, int noffset, const char *p,
				 const char *type)
{
	const char *keyname;
	uint8_t *value;
	int value_len;
	char *algo;
	int required;
	int ret, i;

	debug("%s  %s node:    '%s'\n", p, type,
	      fit_get_name(fit, noffset, NULL));
	printf("%s  %s algo:    ", p, type);
	if (fit_image_hash_get_algo(fit, noffset, &algo)) {
		printf("invalid/unsupported\n");
		return;
	}
	printf("%s", algo);
	keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
	required = fdt_getprop(fit, noffset, "required", NULL) != NULL;
	if (keyname)
		printf(":%s", keyname);
	if (required)
		printf(" (required)");
	printf("\n");

	ret = fit_image_hash_get_value(fit, noffset, &value,
					&value_len);
	printf("%s  %s value:   ", p, type);
	if (ret) {
		printf("unavailable\n");
	} else {
		for (i = 0; i < value_len; i++)
			printf("%02x", value[i]);
		printf("\n");
	}

	debug("%s  %s len:     %d\n", p, type, value_len);

	/* Signatures have a time stamp */
	if (IMAGE_ENABLE_TIMESTAMP && keyname) {
		time_t timestamp;

		printf("%s  Timestamp:    ", p);
		if (fit_get_timestamp(fit, noffset, &timestamp))
			printf("unavailable\n");
		else
			genimg_print_time(timestamp);
	}
}

/**
 * fit_image_print_verification_data() - prints out the hash/signature details
 * @fit: pointer to the FIT format image header
 * @noffset: offset of the hash or signature node
 * @p: pointer to prefix string
 *
 * This lists properies for the processed hash node
 *
 * returns:
 *     no returned results
 */
static void fit_image_print_verification_data(const void *fit, int noffset,
				       const char *p)
{
	const char *name;

	/*
	 * Check subnode name, must be equal to "hash" or "signature".
	 * Multiple hash/signature nodes require unique unit node
	 * names, e.g. hash@1, hash@2, signature@1, signature@2, etc.
	 */
	name = fit_get_name(fit, noffset, NULL);
	if (!strncmp(name, FIT_HASH_NODENAME, strlen(FIT_HASH_NODENAME))) {
		fit_image_print_data(fit, noffset, p, "Hash");
	} else if (!strncmp(name, FIT_SIG_NODENAME,
				strlen(FIT_SIG_NODENAME))) {
		fit_image_print_data(fit, noffset, p, "Sign");
	}
}

/**
 * fit_image_print - prints out the FIT component image details
 * @fit: pointer to the FIT format image header
 * @image_noffset: offset of the component image node
 * @p: pointer to prefix string
 *
 * fit_image_print() lists all mandatory properies for the processed component
 * image. If present, hash nodes are printed out as well. Load
 * address for images of type firmware is also printed out. Since the load
 * address is not mandatory for firmware images, it will be output as
 * "unavailable" when not present.
 *
 * returns:
 *     no returned results
 */
void fit_image_print(const void *fit, int image_noffset, const char *p)
{
	char *desc;
	uint8_t type, arch, os, comp;
	size_t size;
	ulong load, entry;
	const void *data;
	int noffset;
	int ndepth;
	int ret;

	/* Mandatory properties */
	ret = fit_get_desc(fit, image_noffset, &desc);
	printf("%s  Description:  ", p);
	if (ret)
		printf("unavailable\n");
	else
		printf("%s\n", desc);

	if (IMAGE_ENABLE_TIMESTAMP) {
		time_t timestamp;

		ret = fit_get_timestamp(fit, 0, &timestamp);
		printf("%s  Created:      ", p);
		if (ret)
			printf("unavailable\n");
		else
			genimg_print_time(timestamp);
	}

	fit_image_get_type(fit, image_noffset, &type);
	printf("%s  Type:         %s\n", p, genimg_get_type_name(type));

	fit_image_get_comp(fit, image_noffset, &comp);
	printf("%s  Compression:  %s\n", p, genimg_get_comp_name(comp));

	ret = fit_image_get_data(fit, image_noffset, &data, &size);

#ifndef USE_HOSTCC
	printf("%s  Data Start:   ", p);
	if (ret) {
		printf("unavailable\n");
	} else {
		void *vdata = (void *)data;

		printf("0x%08lx\n", (ulong)map_to_sysmem(vdata));
	}
#endif

	printf("%s  Data Size:    ", p);
	if (ret)
		printf("unavailable\n");
	else
		genimg_print_size(size);

	/* Remaining, type dependent properties */
	if ((type == IH_TYPE_KERNEL) || (type == IH_TYPE_STANDALONE) ||
	    (type == IH_TYPE_RAMDISK) || (type == IH_TYPE_FIRMWARE) ||
	    (type == IH_TYPE_FLATDT)) {
		fit_image_get_arch(fit, image_noffset, &arch);
		printf("%s  Architecture: %s\n", p, genimg_get_arch_name(arch));
	}

	if ((type == IH_TYPE_KERNEL) || (type == IH_TYPE_RAMDISK)) {
		fit_image_get_os(fit, image_noffset, &os);
		printf("%s  OS:           %s\n", p, genimg_get_os_name(os));
	}

	if ((type == IH_TYPE_KERNEL) || (type == IH_TYPE_STANDALONE) ||
	    (type == IH_TYPE_FIRMWARE) || (type == IH_TYPE_RAMDISK)) {
		ret = fit_image_get_load(fit, image_noffset, &load);
		printf("%s  Load Address: ", p);
		if (ret)
			printf("unavailable\n");
		else
			printf("0x%08lx\n", load);
	}

	if ((type == IH_TYPE_KERNEL) || (type == IH_TYPE_STANDALONE) ||
	    (type == IH_TYPE_RAMDISK)) {
		fit_image_get_entry(fit, image_noffset, &entry);
		printf("%s  Entry Point:  ", p);
		if (ret)
			printf("unavailable\n");
		else
			printf("0x%08lx\n", entry);
	}

	/* Process all hash subnodes of the component image node */
	for (ndepth = 0, noffset = fdt_next_node(fit, image_noffset, &ndepth);
	     (noffset >= 0) && (ndepth > 0);
	     noffset = fdt_next_node(fit, noffset, &ndepth)) {
		if (ndepth == 1) {
			/* Direct child node of the component image node */
			fit_image_print_verification_data(fit, noffset, p);
		}
	}
}
#endif

/**
 * fit_get_desc - get node description property
 * @fit: pointer to the FIT format image header
 * @noffset: node offset
 * @desc: double pointer to the char, will hold pointer to the descrption
 *
 * fit_get_desc() reads description property from a given node, if
 * description is found pointer to it is returened in third call argument.
 *
 * returns:
 *     0, on success
 *     -1, on failure
 */
int fit_get_desc(const void *fit, int noffset, char **desc)
{
	int len;

	*desc = (char *)fdt_getprop(fit, noffset, FIT_DESC_PROP, &len);
	if (*desc == NULL) {
		fit_get_debug(fit, noffset, FIT_DESC_PROP, len);
		return -1;
	}

	return 0;
}

/**
 * fit_get_timestamp - get node timestamp property
 * @fit: pointer to the FIT format image header
 * @noffset: node offset
 * @timestamp: pointer to the time_t, will hold read timestamp
 *
 * fit_get_timestamp() reads timestamp poperty from given node, if timestamp
 * is found and has a correct size its value is retured in third call
 * argument.
 *
 * returns:
 *     0, on success
 *     -1, on property read failure
 *     -2, on wrong timestamp size
 */
int fit_get_timestamp(const void *fit, int noffset, time_t *timestamp)
{
	int len;
	const void *data;

	data = fdt_getprop(fit, noffset, FIT_TIMESTAMP_PROP, &len);
	if (data == NULL) {
		fit_get_debug(fit, noffset, FIT_TIMESTAMP_PROP, len);
		return -1;
	}
	if (len != sizeof(uint32_t)) {
		debug("FIT timestamp with incorrect size of (%u)\n", len);
		return -2;
	}

	*timestamp = uimage_to_cpu(*((uint32_t *)data));
	return 0;
}

/**
 * fit_image_get_node - get node offset for component image of a given unit name
 * @fit: pointer to the FIT format image header
 * @image_uname: component image node unit name
 *
 * fit_image_get_node() finds a component image (withing the '/images'
 * node) of a provided unit name. If image is found its node offset is
 * returned to the caller.
 *
 * returns:
 *     image node offset when found (>=0)
 *     negative number on failure (FDT_ERR_* code)
 */
int fit_image_get_node(const void *fit, const char *image_uname)
{
	int noffset, images_noffset;

	images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
	if (images_noffset < 0) {
		debug("Can't find images parent node '%s' (%s)\n",
		      FIT_IMAGES_PATH, fdt_strerror(images_noffset));
		return images_noffset;
	}

	noffset = fdt_subnode_offset(fit, images_noffset, image_uname);
	if (noffset < 0) {
		debug("Can't get node offset for image unit name: '%s' (%s)\n",
		      image_uname, fdt_strerror(noffset));
	}

	return noffset;
}

/**
 * fit_image_get_os - get os id for a given component image node
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @os: pointer to the uint8_t, will hold os numeric id
 *
 * fit_image_get_os() finds os property in a given component image node.
 * If the property is found, its (string) value is translated to the numeric
 * id which is returned to the caller.
 *
 * returns:
 *     0, on success
 *     -1, on failure
 */
int fit_image_get_os(const void *fit, int noffset, uint8_t *os)
{
	int len;
	const void *data;

	/* Get OS name from property data */
	data = fdt_getprop(fit, noffset, FIT_OS_PROP, &len);
	if (data == NULL) {
		fit_get_debug(fit, noffset, FIT_OS_PROP, len);
		*os = -1;
		return -1;
	}

	/* Translate OS name to id */
	*os = genimg_get_os_id(data);
	return 0;
}

/**
 * fit_image_get_arch - get arch id for a given component image node
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @arch: pointer to the uint8_t, will hold arch numeric id
 *
 * fit_image_get_arch() finds arch property in a given component image node.
 * If the property is found, its (string) value is translated to the numeric
 * id which is returned to the caller.
 *
 * returns:
 *     0, on success
 *     -1, on failure
 */
int fit_image_get_arch(const void *fit, int noffset, uint8_t *arch)
{
	int len;
	const void *data;

	/* Get architecture name from property data */
	data = fdt_getprop(fit, noffset, FIT_ARCH_PROP, &len);
	if (data == NULL) {
		fit_get_debug(fit, noffset, FIT_ARCH_PROP, len);
		*arch = -1;
		return -1;
	}

	/* Translate architecture name to id */
	*arch = genimg_get_arch_id(data);
	return 0;
}

/**
 * fit_image_get_type - get type id for a given component image node
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @type: pointer to the uint8_t, will hold type numeric id
 *
 * fit_image_get_type() finds type property in a given component image node.
 * If the property is found, its (string) value is translated to the numeric
 * id which is returned to the caller.
 *
 * returns:
 *     0, on success
 *     -1, on failure
 */
int fit_image_get_type(const void *fit, int noffset, uint8_t *type)
{
	int len;
	const void *data;

	/* Get image type name from property data */
	data = fdt_getprop(fit, noffset, FIT_TYPE_PROP, &len);
	if (data == NULL) {
		fit_get_debug(fit, noffset, FIT_TYPE_PROP, len);
		*type = -1;
		return -1;
	}

	/* Translate image type name to id */
	*type = genimg_get_type_id(data);
	return 0;
}

/**
 * fit_image_get_comp - get comp id for a given component image node
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @comp: pointer to the uint8_t, will hold comp numeric id
 *
 * fit_image_get_comp() finds comp property in a given component image node.
 * If the property is found, its (string) value is translated to the numeric
 * id which is returned to the caller.
 *
 * returns:
 *     0, on success
 *     -1, on failure
 */
int fit_image_get_comp(const void *fit, int noffset, uint8_t *comp)
{
	int len;
	const void *data;

	/* Get compression name from property data */
	data = fdt_getprop(fit, noffset, FIT_COMP_PROP, &len);
	if (data == NULL) {
		fit_get_debug(fit, noffset, FIT_COMP_PROP, len);
		*comp = -1;
		return -1;
	}

	/* Translate compression name to id */
	*comp = genimg_get_comp_id(data);
	return 0;
}

/**
 * fit_image_get_load() - get load addr property for given component image node
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @load: pointer to the uint32_t, will hold load address
 *
 * fit_image_get_load() finds load address property in a given component
 * image node. If the property is found, its value is returned to the caller.
 *
 * returns:
 *     0, on success
 *     -1, on failure
 */
int fit_image_get_load(const void *fit, int noffset, ulong *load)
{
	int len;
	const uint32_t *data;

	data = fdt_getprop(fit, noffset, FIT_LOAD_PROP, &len);
	if (data == NULL) {
		fit_get_debug(fit, noffset, FIT_LOAD_PROP, len);
		return -1;
	}

	*load = uimage_to_cpu(*data);
	return 0;
}

/**
 * fit_image_get_entry() - get entry point address property
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @entry: pointer to the uint32_t, will hold entry point address
 *
 * This gets the entry point address property for a given component image
 * node.
 *
 * fit_image_get_entry() finds entry point address property in a given
 * component image node.  If the property is found, its value is returned
 * to the caller.
 *
 * returns:
 *     0, on success
 *     -1, on failure
 */
int fit_image_get_entry(const void *fit, int noffset, ulong *entry)
{
	int len;
	const uint32_t *data;

	data = fdt_getprop(fit, noffset, FIT_ENTRY_PROP, &len);
	if (data == NULL) {
		fit_get_debug(fit, noffset, FIT_ENTRY_PROP, len);
		return -1;
	}

	*entry = uimage_to_cpu(*data);
	return 0;
}

/**
 * fit_image_get_data - get data property and its size for a given component image node
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @data: double pointer to void, will hold data property's data address
 * @size: pointer to size_t, will hold data property's data size
 *
 * fit_image_get_data() finds data property in a given component image node.
 * If the property is found its data start address and size are returned to
 * the caller.
 *
 * returns:
 *     0, on success
 *     -1, on failure
 */
int fit_image_get_data(const void *fit, int noffset,
		const void **data, size_t *size)
{
	int len;

	*data = fdt_getprop(fit, noffset, FIT_DATA_PROP, &len);
	if (*data == NULL) {
		fit_get_debug(fit, noffset, FIT_DATA_PROP, len);
		*size = 0;
		return -1;
	}

	*size = len;
	return 0;
}

/**
 * fit_image_hash_get_algo - get hash algorithm name
 * @fit: pointer to the FIT format image header
 * @noffset: hash node offset
 * @algo: double pointer to char, will hold pointer to the algorithm name
 *
 * fit_image_hash_get_algo() finds hash algorithm property in a given hash node.
 * If the property is found its data start address is returned to the caller.
 *
 * returns:
 *     0, on success
 *     -1, on failure
 */
int fit_image_hash_get_algo(const void *fit, int noffset, char **algo)
{
	int len;

	*algo = (char *)fdt_getprop(fit, noffset, FIT_ALGO_PROP, &len);
	if (*algo == NULL) {
		fit_get_debug(fit, noffset, FIT_ALGO_PROP, len);
		return -1;
	}

	return 0;
}

/**
 * fit_image_hash_get_value - get hash value and length
 * @fit: pointer to the FIT format image header
 * @noffset: hash node offset
 * @value: double pointer to uint8_t, will hold address of a hash value data
 * @value_len: pointer to an int, will hold hash data length
 *
 * fit_image_hash_get_value() finds hash value property in a given hash node.
 * If the property is found its data start address and size are returned to
 * the caller.
 *
 * returns:
 *     0, on success
 *     -1, on failure
 */
int fit_image_hash_get_value(const void *fit, int noffset, uint8_t **value,
				int *value_len)
{
	int len;

	*value = (uint8_t *)fdt_getprop(fit, noffset, FIT_VALUE_PROP, &len);
	if (*value == NULL) {
		fit_get_debug(fit, noffset, FIT_VALUE_PROP, len);
		*value_len = 0;
		return -1;
	}

	*value_len = len;
	return 0;
}

/**
 * fit_image_hash_get_ignore - get hash ignore flag
 * @fit: pointer to the FIT format image header
 * @noffset: hash node offset
 * @ignore: pointer to an int, will hold hash ignore flag
 *
 * fit_image_hash_get_ignore() finds hash ignore property in a given hash node.
 * If the property is found and non-zero, the hash algorithm is not verified by
 * u-boot automatically.
 *
 * returns:
 *     0, on ignore not found
 *     value, on ignore found
 */
static int fit_image_hash_get_ignore(const void *fit, int noffset, int *ignore)
{
	int len;
	int *value;

	value = (int *)fdt_getprop(fit, noffset, FIT_IGNORE_PROP, &len);
	if (value == NULL || len != sizeof(int))
		*ignore = 0;
	else
		*ignore = *value;

	return 0;
}

/**
 * fit_set_timestamp - set node timestamp property
 * @fit: pointer to the FIT format image header
 * @noffset: node offset
 * @timestamp: timestamp value to be set
 *
 * fit_set_timestamp() attempts to set timestamp property in the requested
 * node and returns operation status to the caller.
 *
 * returns:
 *     0, on success
 *     -ENOSPC if no space in device tree, -1 for other error
 */
int fit_set_timestamp(void *fit, int noffset, time_t timestamp)
{
	uint32_t t;
	int ret;

	t = cpu_to_uimage(timestamp);
	ret = fdt_setprop(fit, noffset, FIT_TIMESTAMP_PROP, &t,
				sizeof(uint32_t));
	if (ret) {
		printf("Can't set '%s' property for '%s' node (%s)\n",
		       FIT_TIMESTAMP_PROP, fit_get_name(fit, noffset, NULL),
		       fdt_strerror(ret));
		return ret == -FDT_ERR_NOSPACE ? -ENOSPC : -1;
	}

	return 0;
}

/**
 * calculate_hash - calculate and return hash for provided input data
 * @data: pointer to the input data
 * @data_len: data length
 * @algo: requested hash algorithm
 * @value: pointer to the char, will hold hash value data (caller must
 * allocate enough free space)
 * value_len: length of the calculated hash
 *
 * calculate_hash() computes input data hash according to the requested
 * algorithm.
 * Resulting hash value is placed in caller provided 'value' buffer, length
 * of the calculated hash is returned via value_len pointer argument.
 *
 * returns:
 *     0, on success
 *    -1, when algo is unsupported
 */
int calculate_hash(const void *data, int data_len, const char *algo,
			uint8_t *value, int *value_len)
{
	if (IMAGE_ENABLE_CRC32 && strcmp(algo, "crc32") == 0) {
		*((uint32_t *)value) = crc32_wd(0, data, data_len,
							CHUNKSZ_CRC32);
		*((uint32_t *)value) = cpu_to_uimage(*((uint32_t *)value));
		*value_len = 4;
	} else if (IMAGE_ENABLE_SHA1 && strcmp(algo, "sha1") == 0) {
		sha1_csum_wd((unsigned char *)data, data_len,
			     (unsigned char *)value, CHUNKSZ_SHA1);
		*value_len = 20;
	} else if (IMAGE_ENABLE_SHA256 && strcmp(algo, "sha256") == 0) {
		sha256_csum_wd((unsigned char *)data, data_len,
			       (unsigned char *)value, CHUNKSZ_SHA256);
		*value_len = SHA256_SUM_LEN;
	} else if (IMAGE_ENABLE_MD5 && strcmp(algo, "md5") == 0) {
		md5_wd((unsigned char *)data, data_len, value, CHUNKSZ_MD5);
		*value_len = 16;
	} else {
		debug("Unsupported hash alogrithm\n");
		return -1;
	}
	return 0;
}

static int fit_image_check_hash(const void *fit, int noffset, const void *data,
				size_t size, char **err_msgp)
{
	uint8_t value[FIT_MAX_HASH_LEN];
	int value_len;
	char *algo;
	uint8_t *fit_value;
	int fit_value_len;
	int ignore;

	*err_msgp = NULL;

	if (fit_image_hash_get_algo(fit, noffset, &algo)) {
		*err_msgp = "Can't get hash algo property";
		return -1;
	}
	printf("%s", algo);

	if (IMAGE_ENABLE_IGNORE) {
		fit_image_hash_get_ignore(fit, noffset, &ignore);
		if (ignore) {
			printf("-skipped ");
			return 0;
		}
	}

	if (fit_image_hash_get_value(fit, noffset, &fit_value,
				     &fit_value_len)) {
		*err_msgp = "Can't get hash value property";
		return -1;
	}

	if (calculate_hash(data, size, algo, value, &value_len)) {
		*err_msgp = "Unsupported hash algorithm";
		return -1;
	}

	if (value_len != fit_value_len) {
		*err_msgp = "Bad hash value len";
		return -1;
	} else if (memcmp(value, fit_value, value_len) != 0) {
		*err_msgp = "Bad hash value";
		return -1;
	}

	return 0;
}

/**
 * fit_image_verify - verify data intergity
 * @fit: pointer to the FIT format image header
 * @image_noffset: component image node offset
 *
 * fit_image_verify() goes over component image hash nodes,
 * re-calculates each data hash and compares with the value stored in hash
 * node.
 *
 * returns:
 *     1, if all hashes are valid
 *     0, otherwise (or on error)
 */
int fit_image_verify(const void *fit, int image_noffset)
{
	const void	*data;
	size_t		size;
	int		noffset = 0;
	char		*err_msg = "";
	int verify_all = 1;
	int ret;

	/* Get image data and data length */
	if (fit_image_get_data(fit, image_noffset, &data, &size)) {
		err_msg = "Can't get image data/size";
		goto error;
	}

	/* Verify all required signatures */
	if (IMAGE_ENABLE_VERIFY &&
	    fit_image_verify_required_sigs(fit, image_noffset, data, size,
					   gd_fdt_blob(), &verify_all)) {
		err_msg = "Unable to verify required signature";
		goto error;
	}

	/* Process all hash subnodes of the component image node */
	for (noffset = fdt_first_subnode(fit, image_noffset);
	     noffset >= 0;
	     noffset = fdt_next_subnode(fit, noffset)) {
		const char *name = fit_get_name(fit, noffset, NULL);

		/*
		 * Check subnode name, must be equal to "hash".
		 * Multiple hash nodes require unique unit node
		 * names, e.g. hash@1, hash@2, etc.
		 */
		if (!strncmp(name, FIT_HASH_NODENAME,
			     strlen(FIT_HASH_NODENAME))) {
			if (fit_image_check_hash(fit, noffset, data, size,
						 &err_msg))
				goto error;
			puts("+ ");
		} else if (IMAGE_ENABLE_VERIFY && verify_all &&
				!strncmp(name, FIT_SIG_NODENAME,
					strlen(FIT_SIG_NODENAME))) {
			ret = fit_image_check_sig(fit, noffset, data,
							size, -1, &err_msg);
			if (ret)
				puts("- ");
			else
				puts("+ ");
		}
	}

	if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
		err_msg = "Corrupted or truncated tree";
		goto error;
	}

	return 1;

error:
	printf(" error!\n%s for '%s' hash node in '%s' image node\n",
	       err_msg, fit_get_name(fit, noffset, NULL),
	       fit_get_name(fit, image_noffset, NULL));
	return 0;
}

/**
 * fit_all_image_verify - verify data intergity for all images
 * @fit: pointer to the FIT format image header
 *
 * fit_all_image_verify() goes over all images in the FIT and
 * for every images checks if all it's hashes are valid.
 *
 * returns:
 *     1, if all hashes of all images are valid
 *     0, otherwise (or on error)
 */
int fit_all_image_verify(const void *fit)
{
	int images_noffset;
	int noffset;
	int ndepth;
	int count;

	/* Find images parent node offset */
	images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
	if (images_noffset < 0) {
		printf("Can't find images parent node '%s' (%s)\n",
		       FIT_IMAGES_PATH, fdt_strerror(images_noffset));
		return 0;
	}

	/* Process all image subnodes, check hashes for each */
	printf("## Checking hash(es) for FIT Image at %08lx ...\n",
	       (ulong)fit);
	for (ndepth = 0, count = 0,
	     noffset = fdt_next_node(fit, images_noffset, &ndepth);
			(noffset >= 0) && (ndepth > 0);
			noffset = fdt_next_node(fit, noffset, &ndepth)) {
		if (ndepth == 1) {
			/*
			 * Direct child node of the images parent node,
			 * i.e. component image node.
			 */
			printf("   Hash(es) for Image %u (%s): ", count++,
			       fit_get_name(fit, noffset, NULL));

			if (!fit_image_verify(fit, noffset))
				return 0;
			printf("\n");
		}
	}
	return 1;
}

/**
 * fit_image_check_os - check whether image node is of a given os type
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @os: requested image os
 *
 * fit_image_check_os() reads image os property and compares its numeric
 * id with the requested os. Comparison result is returned to the caller.
 *
 * returns:
 *     1 if image is of given os type
 *     0 otherwise (or on error)
 */
int fit_image_check_os(const void *fit, int noffset, uint8_t os)
{
	uint8_t image_os;

	if (fit_image_get_os(fit, noffset, &image_os))
		return 0;
	return (os == image_os);
}

/**
 * fit_image_check_arch - check whether image node is of a given arch
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @arch: requested imagearch
 *
 * fit_image_check_arch() reads image arch property and compares its numeric
 * id with the requested arch. Comparison result is returned to the caller.
 *
 * returns:
 *     1 if image is of given arch
 *     0 otherwise (or on error)
 */
int fit_image_check_arch(const void *fit, int noffset, uint8_t arch)
{
	uint8_t image_arch;

	if (fit_image_get_arch(fit, noffset, &image_arch))
		return 0;
	return (arch == image_arch);
}

/**
 * fit_image_check_type - check whether image node is of a given type
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @type: requested image type
 *
 * fit_image_check_type() reads image type property and compares its numeric
 * id with the requested type. Comparison result is returned to the caller.
 *
 * returns:
 *     1 if image is of given type
 *     0 otherwise (or on error)
 */
int fit_image_check_type(const void *fit, int noffset, uint8_t type)
{
	uint8_t image_type;

	if (fit_image_get_type(fit, noffset, &image_type))
		return 0;
	return (type == image_type);
}

/**
 * fit_image_check_comp - check whether image node uses given compression
 * @fit: pointer to the FIT format image header
 * @noffset: component image node offset
 * @comp: requested image compression type
 *
 * fit_image_check_comp() reads image compression property and compares its
 * numeric id with the requested compression type. Comparison result is
 * returned to the caller.
 *
 * returns:
 *     1 if image uses requested compression
 *     0 otherwise (or on error)
 */
int fit_image_check_comp(const void *fit, int noffset, uint8_t comp)
{
	uint8_t image_comp;

	if (fit_image_get_comp(fit, noffset, &image_comp))
		return 0;
	return (comp == image_comp);
}

/**
 * fit_check_format - sanity check FIT image format
 * @fit: pointer to the FIT format image header
 *
 * fit_check_format() runs a basic sanity FIT image verification.
 * Routine checks for mandatory properties, nodes, etc.
 *
 * returns:
 *     1, on success
 *     0, on failure
 */
int fit_check_format(const void *fit)
{
	/* mandatory / node 'description' property */
	if (fdt_getprop(fit, 0, FIT_DESC_PROP, NULL) == NULL) {
		debug("Wrong FIT format: no description\n");
		return 0;
	}

	if (IMAGE_ENABLE_TIMESTAMP) {
		/* mandatory / node 'timestamp' property */
		if (fdt_getprop(fit, 0, FIT_TIMESTAMP_PROP, NULL) == NULL) {
			debug("Wrong FIT format: no timestamp\n");
			return 0;
		}
	}

	/* mandatory subimages parent '/images' node */
	if (fdt_path_offset(fit, FIT_IMAGES_PATH) < 0) {
		debug("Wrong FIT format: no images parent node\n");
		return 0;
	}

	return 1;
}


/**
 * fit_conf_find_compat
 * @fit: pointer to the FIT format image header
 * @fdt: pointer to the device tree to compare against
 *
 * fit_conf_find_compat() attempts to find the configuration whose fdt is the
 * most compatible with the passed in device tree.
 *
 * Example:
 *
 * / o image-tree
 *   |-o images
 *   | |-o fdt@1
 *   | |-o fdt@2
 *   |
 *   |-o configurations
 *     |-o config@1
 *     | |-fdt = fdt@1
 *     |
 *     |-o config@2
 *       |-fdt = fdt@2
 *
 * / o U-Boot fdt
 *   |-compatible = "foo,bar", "bim,bam"
 *
 * / o kernel fdt1
 *   |-compatible = "foo,bar",
 *
 * / o kernel fdt2
 *   |-compatible = "bim,bam", "baz,biz"
 *
 * Configuration 1 would be picked because the first string in U-Boot's
 * compatible list, "foo,bar", matches a compatible string in the root of fdt1.
 * "bim,bam" in fdt2 matches the second string which isn't as good as fdt1.
 *
 * returns:
 *     offset to the configuration to use if one was found
 *     -1 otherwise
 */
int fit_conf_find_compat(const void *fit, const void *fdt)
{
	int ndepth = 0;
	int noffset, confs_noffset, images_noffset;
	const void *fdt_compat;
	int fdt_compat_len;
	int best_match_offset = 0;
	int best_match_pos = 0;

	confs_noffset = fdt_path_offset(fit, FIT_CONFS_PATH);
	images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
	if (confs_noffset < 0 || images_noffset < 0) {
		debug("Can't find configurations or images nodes.\n");
		return -1;
	}

	fdt_compat = fdt_getprop(fdt, 0, "compatible", &fdt_compat_len);
	if (!fdt_compat) {
		debug("Fdt for comparison has no \"compatible\" property.\n");
		return -1;
	}

	/*
	 * Loop over the configurations in the FIT image.
	 */
	for (noffset = fdt_next_node(fit, confs_noffset, &ndepth);
			(noffset >= 0) && (ndepth > 0);
			noffset = fdt_next_node(fit, noffset, &ndepth)) {
		const void *kfdt;
		const char *kfdt_name;
		int kfdt_noffset;
		const char *cur_fdt_compat;
		int len;
		size_t size;
		int i;

		if (ndepth > 1)
			continue;

		kfdt_name = fdt_getprop(fit, noffset, "fdt", &len);
		if (!kfdt_name) {
			debug("No fdt property found.\n");
			continue;
		}
		kfdt_noffset = fdt_subnode_offset(fit, images_noffset,
						  kfdt_name);
		if (kfdt_noffset < 0) {
			debug("No image node named \"%s\" found.\n",
			      kfdt_name);
			continue;
		}
		/*
		 * Get a pointer to this configuration's fdt.
		 */
		if (fit_image_get_data(fit, kfdt_noffset, &kfdt, &size)) {
			debug("Failed to get fdt \"%s\".\n", kfdt_name);
			continue;
		}

		len = fdt_compat_len;
		cur_fdt_compat = fdt_compat;
		/*
		 * Look for a match for each U-Boot compatibility string in
		 * turn in this configuration's fdt.
		 */
		for (i = 0; len > 0 &&
		     (!best_match_offset || best_match_pos > i); i++) {
			int cur_len = strlen(cur_fdt_compat) + 1;

			if (!fdt_node_check_compatible(kfdt, 0,
						       cur_fdt_compat)) {
				best_match_offset = noffset;
				best_match_pos = i;
				break;
			}
			len -= cur_len;
			cur_fdt_compat += cur_len;
		}
	}
	if (!best_match_offset) {
		debug("No match found.\n");
		return -1;
	}

	return best_match_offset;
}

/**
 * fit_conf_get_node - get node offset for configuration of a given unit name
 * @fit: pointer to the FIT format image header
 * @conf_uname: configuration node unit name
 *
 * fit_conf_get_node() finds a configuration (withing the '/configurations'
 * parant node) of a provided unit name. If configuration is found its node
 * offset is returned to the caller.
 *
 * When NULL is provided in second argument fit_conf_get_node() will search
 * for a default configuration node instead. Default configuration node unit
 * name is retrieved from FIT_DEFAULT_PROP property of the '/configurations'
 * node.
 *
 * returns:
 *     configuration node offset when found (>=0)
 *     negative number on failure (FDT_ERR_* code)
 */
int fit_conf_get_node(const void *fit, const char *conf_uname)
{
	int noffset, confs_noffset;
	int len;

	confs_noffset = fdt_path_offset(fit, FIT_CONFS_PATH);
	if (confs_noffset < 0) {
		debug("Can't find configurations parent node '%s' (%s)\n",
		      FIT_CONFS_PATH, fdt_strerror(confs_noffset));
		return confs_noffset;
	}

	if (conf_uname == NULL) {
		/* get configuration unit name from the default property */
		debug("No configuration specified, trying default...\n");
		conf_uname = (char *)fdt_getprop(fit, confs_noffset,
						 FIT_DEFAULT_PROP, &len);
		if (conf_uname == NULL) {
			fit_get_debug(fit, confs_noffset, FIT_DEFAULT_PROP,
				      len);
			return len;
		}
		debug("Found default configuration: '%s'\n", conf_uname);
	}

	noffset = fdt_subnode_offset(fit, confs_noffset, conf_uname);
	if (noffset < 0) {
		debug("Can't get node offset for configuration unit name: '%s' (%s)\n",
		      conf_uname, fdt_strerror(noffset));
	}

	return noffset;
}

int fit_conf_get_prop_node(const void *fit, int noffset,
		const char *prop_name)
{
	char *uname;
	int len;

	/* get kernel image unit name from configuration kernel property */
	uname = (char *)fdt_getprop(fit, noffset, prop_name, &len);
	if (uname == NULL)
		return len;

	return fit_image_get_node(fit, uname);
}

/**
 * fit_conf_print - prints out the FIT configuration details
 * @fit: pointer to the FIT format image header
 * @noffset: offset of the configuration node
 * @p: pointer to prefix string
 *
 * fit_conf_print() lists all mandatory properies for the processed
 * configuration node.
 *
 * returns:
 *     no returned results
 */
void fit_conf_print(const void *fit, int noffset, const char *p)
{
	char *desc;
	char *uname;
	int ret;

	/* Mandatory properties */
	ret = fit_get_desc(fit, noffset, &desc);
	printf("%s  Description:  ", p);
	if (ret)
		printf("unavailable\n");
	else
		printf("%s\n", desc);

	uname = (char *)fdt_getprop(fit, noffset, FIT_KERNEL_PROP, NULL);
	printf("%s  Kernel:       ", p);
	if (uname == NULL)
		printf("unavailable\n");
	else
		printf("%s\n", uname);

	/* Optional properties */
	uname = (char *)fdt_getprop(fit, noffset, FIT_RAMDISK_PROP, NULL);
	if (uname)
		printf("%s  Init Ramdisk: %s\n", p, uname);

	uname = (char *)fdt_getprop(fit, noffset, FIT_FDT_PROP, NULL);
	if (uname)
		printf("%s  FDT:          %s\n", p, uname);
}

int fit_image_select(const void *fit, int rd_noffset, int verify)
{
	fit_image_print(fit, rd_noffset, "   ");

	if (verify) {
		puts("   Verifying Hash Integrity ... ");
		if (!fit_image_verify(fit, rd_noffset)) {
			puts("Bad Data Hash\n");
			return -EACCES;
		}
		puts("OK\n");
	}

	return 0;
}

int fit_get_node_from_config(bootm_headers_t *images, const char *prop_name,
			ulong addr)
{
	int cfg_noffset;
	void *fit_hdr;
	int noffset;

	debug("*  %s: using config '%s' from image at 0x%08lx\n",
	      prop_name, images->fit_uname_cfg, addr);

	/* Check whether configuration has this property defined */
	fit_hdr = map_sysmem(addr, 0);
	cfg_noffset = fit_conf_get_node(fit_hdr, images->fit_uname_cfg);
	if (cfg_noffset < 0) {
		debug("*  %s: no such config\n", prop_name);
		return -ENOENT;
	}

	noffset = fit_conf_get_prop_node(fit_hdr, cfg_noffset, prop_name);
	if (noffset < 0) {
		debug("*  %s: no '%s' in config\n", prop_name, prop_name);
		return -ENOLINK;
	}

	return noffset;
}

/**
 * fit_get_image_type_property() - get property name for IH_TYPE_...
 *
 * @return the properly name where we expect to find the image in the
 * config node
 */
static const char *fit_get_image_type_property(int type)
{
	/*
	 * This is sort-of available in the uimage_type[] table in image.c
	 * but we don't have access to the sohrt name, and "fdt" is different
	 * anyway. So let's just keep it here.
	 */
	switch (type) {
	case IH_TYPE_FLATDT:
		return FIT_FDT_PROP;
	case IH_TYPE_KERNEL:
		return FIT_KERNEL_PROP;
	case IH_TYPE_RAMDISK:
		return FIT_RAMDISK_PROP;
	}

	return "unknown";
}

int fit_image_load(bootm_headers_t *images, ulong addr,
		   const char **fit_unamep, const char **fit_uname_configp,
		   int arch, int image_type, int bootstage_id,
		   enum fit_load_op load_op, ulong *datap, ulong *lenp)
{
	int cfg_noffset, noffset;
	const char *fit_uname;
	const char *fit_uname_config;
	const void *fit;
	const void *buf;
	size_t size;
	int type_ok, os_ok;
	ulong load, data, len;
	const char *prop_name;
	int ret;

	fit = map_sysmem(addr, 0);
	fit_uname = fit_unamep ? *fit_unamep : NULL;
	fit_uname_config = fit_uname_configp ? *fit_uname_configp : NULL;
	prop_name = fit_get_image_type_property(image_type);
	printf("## Loading %s from FIT Image at %08lx ...\n", prop_name, addr);

	bootstage_mark(bootstage_id + BOOTSTAGE_SUB_FORMAT);
	if (!fit_check_format(fit)) {
		printf("Bad FIT %s image format!\n", prop_name);
		bootstage_error(bootstage_id + BOOTSTAGE_SUB_FORMAT);
		return -ENOEXEC;
	}
	bootstage_mark(bootstage_id + BOOTSTAGE_SUB_FORMAT_OK);
	if (fit_uname) {
		/* get FIT component image node offset */
		bootstage_mark(bootstage_id + BOOTSTAGE_SUB_UNIT_NAME);
		noffset = fit_image_get_node(fit, fit_uname);
	} else {
		/*
		 * no image node unit name, try to get config
		 * node first. If config unit node name is NULL
		 * fit_conf_get_node() will try to find default config node
		 */
		bootstage_mark(bootstage_id + BOOTSTAGE_SUB_NO_UNIT_NAME);
		if (IMAGE_ENABLE_BEST_MATCH && !fit_uname_config) {
			cfg_noffset = fit_conf_find_compat(fit, gd_fdt_blob());
		} else {
			cfg_noffset = fit_conf_get_node(fit,
							fit_uname_config);
		}
		if (cfg_noffset < 0) {
			puts("Could not find configuration node\n");
			bootstage_error(bootstage_id +
					BOOTSTAGE_SUB_NO_UNIT_NAME);
			return -ENOENT;
		}
		fit_uname_config = fdt_get_name(fit, cfg_noffset, NULL);
		printf("   Using '%s' configuration\n", fit_uname_config);
		if (image_type == IH_TYPE_KERNEL) {
			/* Remember (and possibly verify) this config */
			images->fit_uname_cfg = fit_uname_config;
			if (IMAGE_ENABLE_VERIFY && images->verify) {
				puts("   Verifying Hash Integrity ... ");
				if (fit_config_verify(fit, cfg_noffset)) {
					puts("Bad Data Hash\n");
					bootstage_error(bootstage_id +
						BOOTSTAGE_SUB_HASH);
					return -EACCES;
				}
				puts("OK\n");
			}
			bootstage_mark(BOOTSTAGE_ID_FIT_CONFIG);
		}

		noffset = fit_conf_get_prop_node(fit, cfg_noffset,
						 prop_name);
		fit_uname = fit_get_name(fit, noffset, NULL);
	}
	if (noffset < 0) {
		puts("Could not find subimage node\n");
		bootstage_error(bootstage_id + BOOTSTAGE_SUB_SUBNODE);
		return -ENOENT;
	}

	printf("   Trying '%s' %s subimage\n", fit_uname, prop_name);

	ret = fit_image_select(fit, noffset, images->verify);
	if (ret) {
		bootstage_error(bootstage_id + BOOTSTAGE_SUB_HASH);
		return ret;
	}

	bootstage_mark(bootstage_id + BOOTSTAGE_SUB_CHECK_ARCH);
	if (!fit_image_check_target_arch(fit, noffset)) {
		puts("Unsupported Architecture\n");
		bootstage_error(bootstage_id + BOOTSTAGE_SUB_CHECK_ARCH);
		return -ENOEXEC;
	}

	if (image_type == IH_TYPE_FLATDT &&
	    !fit_image_check_comp(fit, noffset, IH_COMP_NONE)) {
		puts("FDT image is compressed");
		return -EPROTONOSUPPORT;
	}

	bootstage_mark(bootstage_id + BOOTSTAGE_SUB_CHECK_ALL);
	type_ok = fit_image_check_type(fit, noffset, image_type) ||
		(image_type == IH_TYPE_KERNEL &&
			fit_image_check_type(fit, noffset,
					     IH_TYPE_KERNEL_NOLOAD));
	os_ok = image_type == IH_TYPE_FLATDT ||
		fit_image_check_os(fit, noffset, IH_OS_LINUX);
	if (!type_ok || !os_ok) {
		printf("No Linux %s %s Image\n", genimg_get_arch_name(arch),
		       genimg_get_type_name(image_type));
		bootstage_error(bootstage_id + BOOTSTAGE_SUB_CHECK_ALL);
		return -EIO;
	}

	bootstage_mark(bootstage_id + BOOTSTAGE_SUB_CHECK_ALL_OK);

	/* get image data address and length */
	if (fit_image_get_data(fit, noffset, &buf, &size)) {
		printf("Could not find %s subimage data!\n", prop_name);
		bootstage_error(bootstage_id + BOOTSTAGE_SUB_GET_DATA);
		return -ENOENT;
	}
	len = (ulong)size;

	/* verify that image data is a proper FDT blob */
	if (image_type == IH_TYPE_FLATDT && fdt_check_header(buf)) {
		puts("Subimage data is not a FDT");
		return -ENOEXEC;
	}

	bootstage_mark(bootstage_id + BOOTSTAGE_SUB_GET_DATA_OK);

	/*
	 * Work-around for eldk-4.2 which gives this warning if we try to
	 * case in the unmap_sysmem() call:
	 * warning: initialization discards qualifiers from pointer target type
	 */
	{
		void *vbuf = (void *)buf;

		data = map_to_sysmem(vbuf);
	}

	if (load_op == FIT_LOAD_IGNORED) {
		/* Don't load */
	} else if (fit_image_get_load(fit, noffset, &load)) {
		if (load_op == FIT_LOAD_REQUIRED) {
			printf("Can't get %s subimage load address!\n",
			       prop_name);
			bootstage_error(bootstage_id + BOOTSTAGE_SUB_LOAD);
			return -EBADF;
		}
	} else {
		ulong image_start, image_end;
		ulong load_end;
		void *dst;

		/*
		 * move image data to the load address,
		 * make sure we don't overwrite initial image
		 */
		image_start = addr;
		image_end = addr + fit_get_size(fit);

		load_end = load + len;
		if (image_type != IH_TYPE_KERNEL &&
		    load < image_end && load_end > image_start) {
			printf("Error: %s overwritten\n", prop_name);
			return -EXDEV;
		}

		printf("   Loading %s from 0x%08lx to 0x%08lx\n",
		       prop_name, data, load);

		dst = map_sysmem(load, len);
		memmove(dst, buf, len);
		data = load;
	}
	bootstage_mark(bootstage_id + BOOTSTAGE_SUB_LOAD);

	*datap = data;
	*lenp = len;
	if (fit_unamep)
		*fit_unamep = (char *)fit_uname;
	if (fit_uname_configp)
		*fit_uname_configp = (char *)fit_uname_config;

	return noffset;
}