common/spl/spl_fit.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2016 Google, Inc
  * Written by Simon Glass <sjg@chromium.org>
  */

 #include <common.h>
 #include <errno.h>
 #include <fpga.h>
 #include <gzip.h>
 #include <image.h>
 #include <log.h>
 #include <malloc.h>
 #include <spl.h>
 #include <sysinfo.h>
 #include <asm/cache.h>
 #include <linux/libfdt.h>

 DECLARE_GLOBAL_DATA_PTR;

 #ifndef CONFIG_SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ
 #define CONFIG_SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ (64 * 1024)
 #endif

 #ifndef CONFIG_SYS_BOOTM_LEN
 #define CONFIG_SYS_BOOTM_LEN	(64 << 20)
 #endif

 __weak void board_spl_fit_post_load(ulong load_addr, size_t length)
 {
 }

 __weak ulong board_spl_fit_size_align(ulong size)
 {
 	return size;
 }

 static int find_node_from_desc(const void *fit, int node, const char *str)
 {
 	int child;

 	if (node < 0)
 		return -EINVAL;

 	/* iterate the FIT nodes and find a matching description */
 	for (child = fdt_first_subnode(fit, node); child >= 0;
 	     child = fdt_next_subnode(fit, child)) {
 		int len;
 		const char *desc = fdt_getprop(fit, child, "description", &len);

 		if (!desc)
 			continue;

 		if (!strcmp(desc, str))
 			return child;
 	}

 	return -ENOENT;
 }

 /**
  * spl_fit_get_image_name(): By using the matching configuration subnode,
  * retrieve the name of an image, specified by a property name and an index
  * into that.
  * @fit:	Pointer to the FDT blob.
  * @images:	Offset of the /images subnode.
  * @type:	Name of the property within the configuration subnode.
  * @index:	Index into the list of strings in this property.
  * @outname:	Name of the image
  *
  * Return:	0 on success, or a negative error number
  */
 static int spl_fit_get_image_name(const void *fit, int images,
 				  const char *type, int index,
 				  const char **outname)
 {
 	struct udevice *sysinfo;
 	const char *name, *str;
 	__maybe_unused int node;
 	int conf_node;
 	int len, i;
 	bool found = true;

 	conf_node = fit_find_config_node(fit);
 	if (conf_node < 0) {
 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 		printf("No matching DT out of these options:\n");
 		for (node = fdt_first_subnode(fit, conf_node);
 		     node >= 0;
 		     node = fdt_next_subnode(fit, node)) {
 			name = fdt_getprop(fit, node, "description", &len);
 			printf("   %s\n", name);
 		}
 #endif
 		return conf_node;
 	}

 	name = fdt_getprop(fit, conf_node, type, &len);
 	if (!name) {
 		debug("cannot find property '%s': %d\n", type, len);
 		return -EINVAL;
 	}

 	str = name;
 	for (i = 0; i < index; i++) {
 		str = strchr(str, '\0') + 1;
 		if (!str || (str - name >= len)) {
 			found = false;
 			break;
 		}
 	}

 	if (!found && CONFIG_IS_ENABLED(SYSINFO) && !sysinfo_get(&sysinfo)) {
 		int rc;
 		/*
 		 * no string in the property for this index. Check if the
 		 * sysinfo-level code can supply one.
 		 */
 		rc = sysinfo_get_fit_loadable(sysinfo, index - i - 1, type,
 					      &str);
 		if (rc && rc != -ENOENT)
 			return rc;

 		if (!rc) {
 			/*
 			 * The sysinfo provided a name for a loadable.
 			 * Try to match it against the description properties
 			 * first. If no matching node is found, use it as a
 			 * node name.
 			 */
 			int node;
 			int images = fdt_path_offset(fit, FIT_IMAGES_PATH);

 			node = find_node_from_desc(fit, images, str);
 			if (node > 0)
 				str = fdt_get_name(fit, node, NULL);

 			found = true;
 		}
 	}

 	if (!found) {
 		debug("no string for index %d\n", index);
 		return -E2BIG;
 	}

 	*outname = str;
 	return 0;
 }

 /**
  * spl_fit_get_image_node(): By using the matching configuration subnode,
  * retrieve the name of an image, specified by a property name and an index
  * into that.
  * @fit:	Pointer to the FDT blob.
  * @images:	Offset of the /images subnode.
  * @type:	Name of the property within the configuration subnode.
  * @index:	Index into the list of strings in this property.
  *
  * Return:	the node offset of the respective image node or a negative
  *		error number.
  */
 static int spl_fit_get_image_node(const void *fit, int images,
 				  const char *type, int index)
 {
 	const char *str;
 	int err;
 	int node;

 	err = spl_fit_get_image_name(fit, images, type, index, &str);
 	if (err)
 		return err;

 	debug("%s: '%s'\n", type, str);

 	node = fdt_subnode_offset(fit, images, str);
 	if (node < 0) {
 		pr_err("cannot find image node '%s': %d\n", str, node);
 		return -EINVAL;
 	}

 	return node;
 }

 static int get_aligned_image_offset(struct spl_load_info *info, int offset)
 {
 	/*
 	 * If it is a FS read, get the first address before offset which is
 	 * aligned to ARCH_DMA_MINALIGN. If it is raw read return the
 	 * block number to which offset belongs.
 	 */
 	if (info->filename)
 		return offset & ~(ARCH_DMA_MINALIGN - 1);

 	return offset / info->bl_len;
 }

 static int get_aligned_image_overhead(struct spl_load_info *info, int offset)
 {
 	/*
 	 * If it is a FS read, get the difference between the offset and
 	 * the first address before offset which is aligned to
 	 * ARCH_DMA_MINALIGN. If it is raw read return the offset within the
 	 * block.
 	 */
 	if (info->filename)
 		return offset & (ARCH_DMA_MINALIGN - 1);

 	return offset % info->bl_len;
 }

 static int get_aligned_image_size(struct spl_load_info *info, int data_size,
 				  int offset)
 {
 	data_size = data_size + get_aligned_image_overhead(info, offset);

 	if (info->filename)
 		return data_size;

 	return (data_size + info->bl_len - 1) / info->bl_len;
 }

 /**
  * spl_load_fit_image(): load the image described in a certain FIT node
  * @info:	points to information about the device to load data from
  * @sector:	the start sector of the FIT image on the device
  * @fit:	points to the flattened device tree blob describing the FIT
  *		image
  * @base_offset: the beginning of the data area containing the actual
  *		image data, relative to the beginning of the FIT
  * @node:	offset of the DT node describing the image to load (relative
  *		to @fit)
  * @image_info:	will be filled with information about the loaded image
  *		If the FIT node does not contain a "load" (address) property,
  *		the image gets loaded to the address pointed to by the
  *		load_addr member in this struct.
  *
  * Return:	0 on success or a negative error number.
  */
 static int spl_load_fit_image(struct spl_load_info *info, ulong sector,
 			      void *fit, ulong base_offset, int node,
 			      struct spl_image_info *image_info)
 {
 	int offset;
 	size_t length;
 	int len;
 	ulong size;
 	ulong load_addr, load_ptr;
 	void *src;
 	ulong overhead;
 	int nr_sectors;
 	int align_len = ARCH_DMA_MINALIGN - 1;
 	uint8_t image_comp = -1, type = -1;
 	const void *data;
 	bool external_data = false;

 	if (IS_ENABLED(CONFIG_SPL_FPGA) ||
 	    (IS_ENABLED(CONFIG_SPL_OS_BOOT) && IS_ENABLED(CONFIG_SPL_GZIP))) {
 		if (fit_image_get_type(fit, node, &type))
 			puts("Cannot get image type.\n");
 		else
 			debug("%s ", genimg_get_type_name(type));
 	}

 	if (IS_ENABLED(CONFIG_SPL_GZIP)) {
 		fit_image_get_comp(fit, node, &image_comp);
 		debug("%s ", genimg_get_comp_name(image_comp));
 	}

 	if (fit_image_get_load(fit, node, &load_addr))
 		load_addr = image_info->load_addr;

 	if (!fit_image_get_data_position(fit, node, &offset)) {
 		external_data = true;
 	} else if (!fit_image_get_data_offset(fit, node, &offset)) {
 		offset += base_offset;
 		external_data = true;
 	}

 	if (external_data) {
 		/* External data */
 		if (fit_image_get_data_size(fit, node, &len))
 			return -ENOENT;

 		load_ptr = (load_addr + align_len) & ~align_len;
 		length = len;

 		overhead = get_aligned_image_overhead(info, offset);
 		nr_sectors = get_aligned_image_size(info, length, offset);

 		if (info->read(info,
 			       sector + get_aligned_image_offset(info, offset),
 			       nr_sectors, (void *)load_ptr) != nr_sectors)
 			return -EIO;

 		debug("External data: dst=%lx, offset=%x, size=%lx\n",
 		      load_ptr, offset, (unsigned long)length);
 		src = (void *)load_ptr + overhead;
 	} else {
 		/* Embedded data */
 		if (fit_image_get_data(fit, node, &data, &length)) {
 			puts("Cannot get image data/size\n");
 			return -ENOENT;
 		}
 		debug("Embedded data: dst=%lx, size=%lx\n", load_addr,
 		      (unsigned long)length);
 		src = (void *)data;
 	}

 #ifdef CONFIG_SPL_FIT_SIGNATURE
 	printf("## Checking hash(es) for Image %s ... ",
 	       fit_get_name(fit, node, NULL));
 	if (!fit_image_verify_with_data(fit, node,
 					 src, length))
 		return -EPERM;
 	puts("OK\n");
 #endif

 #ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS
 	board_fit_image_post_process(&src, &length);
 #endif

 	if (IS_ENABLED(CONFIG_SPL_GZIP) && image_comp == IH_COMP_GZIP) {
 		size = length;
 		if (gunzip((void *)load_addr, CONFIG_SYS_BOOTM_LEN,
 			   src, &size)) {
 			puts("Uncompressing error\n");
 			return -EIO;
 		}
 		length = size;
 	} else {
 		memcpy((void *)load_addr, src, length);
 	}

 	if (image_info) {
 		ulong entry_point;

 		image_info->load_addr = load_addr;
 		image_info->size = length;

 		if (!fit_image_get_entry(fit, node, &entry_point))
 			image_info->entry_point = entry_point;
 		else
 			image_info->entry_point = FDT_ERROR;
 	}

 	return 0;
 }

 static int spl_fit_append_fdt(struct spl_image_info *spl_image,
 			      struct spl_load_info *info, ulong sector,
 			      void *fit, int images, ulong base_offset)
 {
 	struct spl_image_info image_info;
 	int node, ret = 0, index = 0;

 	/*
 	 * Use the address following the image as target address for the
 	 * device tree.
 	 */
 	image_info.load_addr = spl_image->load_addr + spl_image->size;

 	/* Figure out which device tree the board wants to use */
 	node = spl_fit_get_image_node(fit, images, FIT_FDT_PROP, index++);
 	if (node < 0) {
 		debug("%s: cannot find FDT node\n", __func__);

 		/*
 		 * U-Boot did not find a device tree inside the FIT image. Use
 		 * the U-Boot device tree instead.
 		 */
 		if (gd->fdt_blob)
 			memcpy((void *)image_info.load_addr, gd->fdt_blob,
 			       fdt_totalsize(gd->fdt_blob));
 		else
 			return node;
 	} else {
 		ret = spl_load_fit_image(info, sector, fit, base_offset, node,
 					 &image_info);
 		if (ret < 0)
 			return ret;
 	}

 	/* Make the load-address of the FDT available for the SPL framework */
 	spl_image->fdt_addr = (void *)image_info.load_addr;
 #if !CONFIG_IS_ENABLED(FIT_IMAGE_TINY)
 	if (CONFIG_IS_ENABLED(LOAD_FIT_APPLY_OVERLAY)) {
 		void *tmpbuffer = NULL;

 		for (; ; index++) {
 			node = spl_fit_get_image_node(fit, images, FIT_FDT_PROP,
 						      index);
 			if (node == -E2BIG) {
 				debug("%s: No additional FDT node\n", __func__);
 				break;
 			} else if (node < 0) {
 				debug("%s: unable to find FDT node %d\n",
 				      __func__, index);
 				continue;
 			}

 			if (!tmpbuffer) {
 				/*
 				 * allocate memory to store the DT overlay
 				 * before it is applied. It may not be used
 				 * depending on how the overlay is stored, so
 				 * don't fail yet if the allocation failed.
 				 */
 				tmpbuffer = malloc(CONFIG_SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ);
 				if (!tmpbuffer)
 					debug("%s: unable to allocate space for overlays\n",
 					      __func__);
 			}
 			image_info.load_addr = (ulong)tmpbuffer;
 			ret = spl_load_fit_image(info, sector, fit, base_offset,
 						 node, &image_info);
 			if (ret < 0)
 				break;

 			/* Make room in FDT for changes from the overlay */
 			ret = fdt_increase_size(spl_image->fdt_addr,
 						image_info.size);
 			if (ret < 0)
 				break;

 			ret = fdt_overlay_apply_verbose(spl_image->fdt_addr,
 							(void *)image_info.load_addr);
 			if (ret) {
 				pr_err("failed to apply DT overlay %s\n",
 				       fit_get_name(fit, node, NULL));
 				break;
 			}

 			debug("%s: DT overlay %s applied\n", __func__,
 			      fit_get_name(fit, node, NULL));
 		}
 		free(tmpbuffer);
 		if (ret)
 			return ret;
 	}
 	/* Try to make space, so we can inject details on the loadables */
 	ret = fdt_shrink_to_minimum(spl_image->fdt_addr, 8192);
 	if (ret < 0)
 		return ret;
 #endif

 	return ret;
 }

 static int spl_fit_record_loadable(const void *fit, int images, int index,
 				   void *blob, struct spl_image_info *image)
 {
 	int ret = 0;
 #if !CONFIG_IS_ENABLED(FIT_IMAGE_TINY)
 	const char *name;
 	int node;

 	ret = spl_fit_get_image_name(fit, images, "loadables",
 				     index, &name);
 	if (ret < 0)
 		return ret;

 	node = spl_fit_get_image_node(fit, images, "loadables", index);

 	ret = fdt_record_loadable(blob, index, name, image->load_addr,
 				  image->size, image->entry_point,
 				  fdt_getprop(fit, node, "type", NULL),
 				  fdt_getprop(fit, node, "os", NULL));
 #endif
 	return ret;
 }

 static int spl_fit_image_get_os(const void *fit, int noffset, uint8_t *os)
 {
 #if CONFIG_IS_ENABLED(FIT_IMAGE_TINY) && !defined(CONFIG_SPL_OS_BOOT)
 	const char *name = fdt_getprop(fit, noffset, FIT_OS_PROP, NULL);

 	if (!name)
 		return -ENOENT;

 	/*
 	 * We don't care what the type of the image actually is,
 	 * only whether or not it is U-Boot. This saves some
 	 * space by omitting the large table of OS types.
 	 */
 	if (!strcmp(name, "u-boot"))
 		*os = IH_OS_U_BOOT;
 	else
 		*os = IH_OS_INVALID;

 	return 0;
 #else
 	return fit_image_get_os(fit, noffset, os);
 #endif
 }

 /*
  * The purpose of the FIT load buffer is to provide a memory location that is
  * independent of the load address of any FIT component.
  */
 static void *spl_get_fit_load_buffer(size_t size)
 {
 	void *buf;

 	buf = malloc(size);
 	if (!buf) {
 		pr_err("Could not get FIT buffer of %lu bytes\n", (ulong)size);
 		pr_err("\tcheck CONFIG_SYS_SPL_MALLOC_SIZE\n");
 		buf = spl_get_load_buffer(0, size);
 	}
 	return buf;
 }

 /*
  * Weak default function to allow customizing SPL fit loading for load-only
  * use cases by allowing to skip the parsing/processing of the FIT contents
  * (so that this can be done separately in a more customized fashion)
  */
 __weak bool spl_load_simple_fit_skip_processing(void)
 {
 	return false;
 }

 int spl_load_simple_fit(struct spl_image_info *spl_image,
 			struct spl_load_info *info, ulong sector, void *fit)
 {
 	int sectors;
 	ulong size, hsize;
 	unsigned long count;
 	struct spl_image_info image_info;
 	int node = -1;
 	int images, ret;
 	int base_offset;
 	int index = 0;
 	int firmware_node;

 	/*
 	 * For FIT with external data, figure out where the external images
 	 * start. This is the base for the data-offset properties in each
 	 * image.
 	 */
 	size = fdt_totalsize(fit);
 	size = (size + 3) & ~3;
 	size = board_spl_fit_size_align(size);
 	base_offset = (size + 3) & ~3;

 	/*
 	 * So far we only have one block of data from the FIT. Read the entire
 	 * thing, including that first block.
 	 *
 	 * For FIT with data embedded, data is loaded as part of FIT image.
 	 * For FIT with external data, data is not loaded in this step.
 	 */
 	sectors = get_aligned_image_size(info, size, 0);
 	hsize = sectors * info->bl_len;
 	fit = spl_get_fit_load_buffer(hsize);
 	count = info->read(info, sector, sectors, fit);
 	debug("fit read sector %lx, sectors=%d, dst=%p, count=%lu, size=0x%lx\n",
 	      sector, sectors, fit, count, size);

 	if (count == 0)
 		return -EIO;

 	/* skip further processing if requested to enable load-only use cases */
 	if (spl_load_simple_fit_skip_processing())
 		return 0;

 	if (IS_ENABLED(CONFIG_SPL_FIT_SIGNATURE)) {
 		int conf_offset = fit_find_config_node(fit);

 		printf("## Checking hash(es) for config %s ... ",
 		       fit_get_name(fit, conf_offset, NULL));
 		if (fit_config_verify(fit, conf_offset))
 			return -EPERM;
 		puts("OK\n");
 	}

 	/* find the node holding the images information */
 	images = fdt_path_offset(fit, FIT_IMAGES_PATH);
 	if (images < 0) {
 		debug("%s: Cannot find /images node: %d\n", __func__, images);
 		return -1;
 	}

 #ifdef CONFIG_SPL_FPGA
 	node = spl_fit_get_image_node(fit, images, "fpga", 0);
 	if (node >= 0) {
 		/* Load the image and set up the spl_image structure */
 		ret = spl_load_fit_image(info, sector, fit, base_offset, node,
 					 spl_image);
 		if (ret) {
 			printf("%s: Cannot load the FPGA: %i\n", __func__, ret);
 			return ret;
 		}

 		debug("FPGA bitstream at: %x, size: %x\n",
 		      (u32)spl_image->load_addr, spl_image->size);

 		ret = fpga_load(0, (const void *)spl_image->load_addr,
 				spl_image->size, BIT_FULL);
 		if (ret) {
 			printf("%s: Cannot load the image to the FPGA\n",
 			       __func__);
 			return ret;
 		}

 		puts("FPGA image loaded from FIT\n");
 		node = -1;
 	}
 #endif

 	/*
 	 * Find the U-Boot image using the following search order:
 	 *   - start at 'firmware' (e.g. an ARM Trusted Firmware)
 	 *   - fall back 'kernel' (e.g. a Falcon-mode OS boot
 	 *   - fall back to using the first 'loadables' entry
 	 */
 	if (node < 0)
 		node = spl_fit_get_image_node(fit, images, FIT_FIRMWARE_PROP,
 					      0);
 #ifdef CONFIG_SPL_OS_BOOT
 	if (node < 0)
 		node = spl_fit_get_image_node(fit, images, FIT_KERNEL_PROP, 0);
 #endif
 	if (node < 0) {
 		debug("could not find firmware image, trying loadables...\n");
 		node = spl_fit_get_image_node(fit, images, "loadables", 0);
 		/*
 		 * If we pick the U-Boot image from "loadables", start at
 		 * the second image when later loading additional images.
 		 */
 		index = 1;
 	}
 	if (node < 0) {
 		debug("%s: Cannot find u-boot image node: %d\n",
 		      __func__, node);
 		return -1;
 	}

 	/* Load the image and set up the spl_image structure */
 	ret = spl_load_fit_image(info, sector, fit, base_offset, node,
 				 spl_image);
 	if (ret)
 		return ret;

 	/*
 	 * For backward compatibility, we treat the first node that is
 	 * as a U-Boot image, if no OS-type has been declared.
 	 */
 	if (!spl_fit_image_get_os(fit, node, &spl_image->os))
 		debug("Image OS is %s\n", genimg_get_os_name(spl_image->os));
 #if !defined(CONFIG_SPL_OS_BOOT)
 	else
 		spl_image->os = IH_OS_U_BOOT;
 #endif

 	/*
 	 * Booting a next-stage U-Boot may require us to append the FDT.
 	 * We allow this to fail, as the U-Boot image might embed its FDT.
 	 */
 	if (spl_image->os == IH_OS_U_BOOT) {
 		ret = spl_fit_append_fdt(spl_image, info, sector, fit,
 					 images, base_offset);
 		if (!IS_ENABLED(CONFIG_OF_EMBED) && ret < 0)
 			return ret;
 	}

 	firmware_node = node;
 	/* Now check if there are more images for us to load */
 	for (; ; index++) {
 		uint8_t os_type = IH_OS_INVALID;

 		node = spl_fit_get_image_node(fit, images, "loadables", index);
 		if (node < 0)
 			break;

 		/*
 		 * if the firmware is also a loadable, skip it because
 		 * it already has been loaded. This is typically the case with
 		 * u-boot.img generated by mkimage.
 		 */
 		if (firmware_node == node)
 			continue;

 		ret = spl_load_fit_image(info, sector, fit, base_offset, node,
 					 &image_info);
 		if (ret < 0) {
 			printf("%s: can't load image loadables index %d (ret = %d)\n",
 			       __func__, index, ret);
 			return ret;
 		}

 		if (!spl_fit_image_get_os(fit, node, &os_type))
 			debug("Loadable is %s\n", genimg_get_os_name(os_type));

 		if (os_type == IH_OS_U_BOOT) {
 			spl_fit_append_fdt(&image_info, info, sector,
 					   fit, images, base_offset);
 			spl_image->fdt_addr = image_info.fdt_addr;
 		}

 		/*
 		 * If the "firmware" image did not provide an entry point,
 		 * use the first valid entry point from the loadables.
 		 */
 		if (spl_image->entry_point == FDT_ERROR &&
 		    image_info.entry_point != FDT_ERROR)
 			spl_image->entry_point = image_info.entry_point;

 		/* Record our loadables into the FDT */
 		if (spl_image->fdt_addr)
 			spl_fit_record_loadable(fit, images, index,
 						spl_image->fdt_addr,
 						&image_info);
 	}

 	/*
 	 * If a platform does not provide CONFIG_SYS_UBOOT_START, U-Boot's
 	 * Makefile will set it to 0 and it will end up as the entry point
 	 * here. What it actually means is: use the load address.
 	 */
 	if (spl_image->entry_point == FDT_ERROR || spl_image->entry_point == 0)
 		spl_image->entry_point = spl_image->load_addr;

 	spl_image->flags |= SPL_FIT_FOUND;

 #ifdef CONFIG_IMX_HAB
 	board_spl_fit_post_load((ulong)fit, size);
 #endif

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2016 Google, Inc
	* Written by Simon Glass <sjg@chromium.org>
	*/

	#include <common.h>
	#include <errno.h>
	#include <fpga.h>
	#include <gzip.h>
	#include <image.h>
	#include <log.h>
	#include <malloc.h>
	#include <spl.h>
	#include <sysinfo.h>
	#include <asm/cache.h>
	#include <linux/libfdt.h>

	DECLARE_GLOBAL_DATA_PTR;

	#ifndef CONFIG_SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ
	#define CONFIG_SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ (64 * 1024)
	#endif

	#ifndef CONFIG_SYS_BOOTM_LEN
	#define CONFIG_SYS_BOOTM_LEN (64 << 20)
	#endif

	__weak void board_spl_fit_post_load(ulong load_addr, size_t length)
	{
	}

	__weak ulong board_spl_fit_size_align(ulong size)
	{
	return size;
	}

	static int find_node_from_desc(const void fit, int node, const char str)
	{
	int child;

	if (node < 0)
	return -EINVAL;

	/* iterate the FIT nodes and find a matching description */
	for (child = fdt_first_subnode(fit, node); child >= 0;
	child = fdt_next_subnode(fit, child)) {
	int len;
	const char *desc = fdt_getprop(fit, child, "description", &len);

	if (!desc)
	continue;

	if (!strcmp(desc, str))
	return child;
	}

	return -ENOENT;
	}

	/**
	* spl_fit_get_image_name(): By using the matching configuration subnode,
	* retrieve the name of an image, specified by a property name and an index
	* into that.
	* @fit: Pointer to the FDT blob.
	* @images: Offset of the /images subnode.
	* @type: Name of the property within the configuration subnode.
	* @index: Index into the list of strings in this property.
	* @outname: Name of the image
	*
	* Return: 0 on success, or a negative error number
	*/
	static int spl_fit_get_image_name(const void *fit, int images,
	const char *type, int index,
	const char **outname)
	{
	struct udevice *sysinfo;
	const char name, str;
	__maybe_unused int node;
	int conf_node;
	int len, i;
	bool found = true;

	conf_node = fit_find_config_node(fit);
	if (conf_node < 0) {
	#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
	printf("No matching DT out of these options:\n");
	for (node = fdt_first_subnode(fit, conf_node);
	node >= 0;
	node = fdt_next_subnode(fit, node)) {
	name = fdt_getprop(fit, node, "description", &len);
	printf(" %s\n", name);
	}
	#endif
	return conf_node;
	}

	name = fdt_getprop(fit, conf_node, type, &len);
	if (!name) {
	debug("cannot find property '%s': %d\n", type, len);
	return -EINVAL;
	}

	str = name;
	for (i = 0; i < index; i++) {
	str = strchr(str, '\0') + 1;
	if (!str \|\| (str - name >= len)) {
	found = false;
	break;
	}
	}

	if (!found && CONFIG_IS_ENABLED(SYSINFO) && !sysinfo_get(&sysinfo)) {
	int rc;
	/*
	* no string in the property for this index. Check if the
	* sysinfo-level code can supply one.
	*/
	rc = sysinfo_get_fit_loadable(sysinfo, index - i - 1, type,
	&str);
	if (rc && rc != -ENOENT)
	return rc;

	if (!rc) {
	/*
	* The sysinfo provided a name for a loadable.
	* Try to match it against the description properties
	* first. If no matching node is found, use it as a
	* node name.
	*/
	int node;
	int images = fdt_path_offset(fit, FIT_IMAGES_PATH);

	node = find_node_from_desc(fit, images, str);
	if (node > 0)
	str = fdt_get_name(fit, node, NULL);

	found = true;
	}
	}

	if (!found) {
	debug("no string for index %d\n", index);
	return -E2BIG;
	}

	*outname = str;
	return 0;
	}

	/**
	* spl_fit_get_image_node(): By using the matching configuration subnode,
	* retrieve the name of an image, specified by a property name and an index
	* into that.
	* @fit: Pointer to the FDT blob.
	* @images: Offset of the /images subnode.
	* @type: Name of the property within the configuration subnode.
	* @index: Index into the list of strings in this property.
	*
	* Return: the node offset of the respective image node or a negative
	* error number.
	*/
	static int spl_fit_get_image_node(const void *fit, int images,
	const char *type, int index)
	{
	const char *str;
	int err;
	int node;

	err = spl_fit_get_image_name(fit, images, type, index, &str);
	if (err)
	return err;

	debug("%s: '%s'\n", type, str);

	node = fdt_subnode_offset(fit, images, str);
	if (node < 0) {
	pr_err("cannot find image node '%s': %d\n", str, node);
	return -EINVAL;
	}

	return node;
	}

	static int get_aligned_image_offset(struct spl_load_info *info, int offset)
	{
	/*
	* If it is a FS read, get the first address before offset which is
	* aligned to ARCH_DMA_MINALIGN. If it is raw read return the
	* block number to which offset belongs.
	*/
	if (info->filename)
	return offset & ~(ARCH_DMA_MINALIGN - 1);

	return offset / info->bl_len;
	}

	static int get_aligned_image_overhead(struct spl_load_info *info, int offset)
	{
	/*
	* If it is a FS read, get the difference between the offset and
	* the first address before offset which is aligned to
	* ARCH_DMA_MINALIGN. If it is raw read return the offset within the
	* block.
	*/
	if (info->filename)
	return offset & (ARCH_DMA_MINALIGN - 1);

	return offset % info->bl_len;
	}

	static int get_aligned_image_size(struct spl_load_info *info, int data_size,
	int offset)
	{
	data_size = data_size + get_aligned_image_overhead(info, offset);

	if (info->filename)
	return data_size;

	return (data_size + info->bl_len - 1) / info->bl_len;
	}

	/**
	* spl_load_fit_image(): load the image described in a certain FIT node
	* @info: points to information about the device to load data from
	* @sector: the start sector of the FIT image on the device
	* @fit: points to the flattened device tree blob describing the FIT
	* image
	* @base_offset: the beginning of the data area containing the actual
	* image data, relative to the beginning of the FIT
	* @node: offset of the DT node describing the image to load (relative
	* to @fit)
	* @image_info: will be filled with information about the loaded image
	* If the FIT node does not contain a "load" (address) property,
	* the image gets loaded to the address pointed to by the
	* load_addr member in this struct.
	*
	* Return: 0 on success or a negative error number.
	*/
	static int spl_load_fit_image(struct spl_load_info *info, ulong sector,
	void *fit, ulong base_offset, int node,
	struct spl_image_info *image_info)
	{
	int offset;
	size_t length;
	int len;
	ulong size;
	ulong load_addr, load_ptr;
	void *src;
	ulong overhead;
	int nr_sectors;
	int align_len = ARCH_DMA_MINALIGN - 1;
	uint8_t image_comp = -1, type = -1;
	const void *data;
	bool external_data = false;

	if (IS_ENABLED(CONFIG_SPL_FPGA) \|\|
	(IS_ENABLED(CONFIG_SPL_OS_BOOT) && IS_ENABLED(CONFIG_SPL_GZIP))) {
	if (fit_image_get_type(fit, node, &type))
	puts("Cannot get image type.\n");
	else
	debug("%s ", genimg_get_type_name(type));
	}

	if (IS_ENABLED(CONFIG_SPL_GZIP)) {
	fit_image_get_comp(fit, node, &image_comp);
	debug("%s ", genimg_get_comp_name(image_comp));
	}

	if (fit_image_get_load(fit, node, &load_addr))
	load_addr = image_info->load_addr;

	if (!fit_image_get_data_position(fit, node, &offset)) {
	external_data = true;
	} else if (!fit_image_get_data_offset(fit, node, &offset)) {
	offset += base_offset;
	external_data = true;
	}

	if (external_data) {
	/* External data */
	if (fit_image_get_data_size(fit, node, &len))
	return -ENOENT;

	load_ptr = (load_addr + align_len) & ~align_len;
	length = len;

	overhead = get_aligned_image_overhead(info, offset);
	nr_sectors = get_aligned_image_size(info, length, offset);

	if (info->read(info,
	sector + get_aligned_image_offset(info, offset),
	nr_sectors, (void *)load_ptr) != nr_sectors)
	return -EIO;

	debug("External data: dst=%lx, offset=%x, size=%lx\n",
	load_ptr, offset, (unsigned long)length);
	src = (void *)load_ptr + overhead;
	} else {
	/* Embedded data */
	if (fit_image_get_data(fit, node, &data, &length)) {
	puts("Cannot get image data/size\n");
	return -ENOENT;
	}
	debug("Embedded data: dst=%lx, size=%lx\n", load_addr,
	(unsigned long)length);
	src = (void *)data;
	}

	#ifdef CONFIG_SPL_FIT_SIGNATURE
	printf("## Checking hash(es) for Image %s ... ",
	fit_get_name(fit, node, NULL));
	if (!fit_image_verify_with_data(fit, node,
	src, length))
	return -EPERM;
	puts("OK\n");
	#endif

	#ifdef CONFIG_SPL_FIT_IMAGE_POST_PROCESS
	board_fit_image_post_process(&src, &length);
	#endif

	if (IS_ENABLED(CONFIG_SPL_GZIP) && image_comp == IH_COMP_GZIP) {
	size = length;
	if (gunzip((void *)load_addr, CONFIG_SYS_BOOTM_LEN,
	src, &size)) {
	puts("Uncompressing error\n");
	return -EIO;
	}
	length = size;
	} else {
	memcpy((void *)load_addr, src, length);
	}

	if (image_info) {
	ulong entry_point;

	image_info->load_addr = load_addr;
	image_info->size = length;

	if (!fit_image_get_entry(fit, node, &entry_point))
	image_info->entry_point = entry_point;
	else
	image_info->entry_point = FDT_ERROR;
	}

	return 0;
	}

	static int spl_fit_append_fdt(struct spl_image_info *spl_image,
	struct spl_load_info *info, ulong sector,
	void *fit, int images, ulong base_offset)
	{
	struct spl_image_info image_info;
	int node, ret = 0, index = 0;

	/*
	* Use the address following the image as target address for the
	* device tree.
	*/
	image_info.load_addr = spl_image->load_addr + spl_image->size;

	/* Figure out which device tree the board wants to use */
	node = spl_fit_get_image_node(fit, images, FIT_FDT_PROP, index++);
	if (node < 0) {
	debug("%s: cannot find FDT node\n", __func__);

	/*
	* U-Boot did not find a device tree inside the FIT image. Use
	* the U-Boot device tree instead.
	*/
	if (gd->fdt_blob)
	memcpy((void *)image_info.load_addr, gd->fdt_blob,
	fdt_totalsize(gd->fdt_blob));
	else
	return node;
	} else {
	ret = spl_load_fit_image(info, sector, fit, base_offset, node,
	&image_info);
	if (ret < 0)
	return ret;
	}

	/* Make the load-address of the FDT available for the SPL framework */
	spl_image->fdt_addr = (void *)image_info.load_addr;
	#if !CONFIG_IS_ENABLED(FIT_IMAGE_TINY)
	if (CONFIG_IS_ENABLED(LOAD_FIT_APPLY_OVERLAY)) {
	void *tmpbuffer = NULL;

	for (; ; index++) {
	node = spl_fit_get_image_node(fit, images, FIT_FDT_PROP,
	index);
	if (node == -E2BIG) {
	debug("%s: No additional FDT node\n", __func__);
	break;
	} else if (node < 0) {
	debug("%s: unable to find FDT node %d\n",
	__func__, index);
	continue;
	}

	if (!tmpbuffer) {
	/*
	* allocate memory to store the DT overlay
	* before it is applied. It may not be used
	* depending on how the overlay is stored, so
	* don't fail yet if the allocation failed.
	*/
	tmpbuffer = malloc(CONFIG_SPL_LOAD_FIT_APPLY_OVERLAY_BUF_SZ);
	if (!tmpbuffer)
	debug("%s: unable to allocate space for overlays\n",
	__func__);
	}
	image_info.load_addr = (ulong)tmpbuffer;
	ret = spl_load_fit_image(info, sector, fit, base_offset,
	node, &image_info);
	if (ret < 0)
	break;

	/* Make room in FDT for changes from the overlay */
	ret = fdt_increase_size(spl_image->fdt_addr,
	image_info.size);
	if (ret < 0)
	break;

	ret = fdt_overlay_apply_verbose(spl_image->fdt_addr,
	(void *)image_info.load_addr);
	if (ret) {
	pr_err("failed to apply DT overlay %s\n",
	fit_get_name(fit, node, NULL));
	break;
	}

	debug("%s: DT overlay %s applied\n", __func__,
	fit_get_name(fit, node, NULL));
	}
	free(tmpbuffer);
	if (ret)
	return ret;
	}
	/* Try to make space, so we can inject details on the loadables */
	ret = fdt_shrink_to_minimum(spl_image->fdt_addr, 8192);
	if (ret < 0)
	return ret;
	#endif

	return ret;
	}

	static int spl_fit_record_loadable(const void *fit, int images, int index,
	void blob, struct spl_image_info image)
	{
	int ret = 0;
	#if !CONFIG_IS_ENABLED(FIT_IMAGE_TINY)
	const char *name;
	int node;

	ret = spl_fit_get_image_name(fit, images, "loadables",
	index, &name);
	if (ret < 0)
	return ret;

	node = spl_fit_get_image_node(fit, images, "loadables", index);

	ret = fdt_record_loadable(blob, index, name, image->load_addr,
	image->size, image->entry_point,
	fdt_getprop(fit, node, "type", NULL),
	fdt_getprop(fit, node, "os", NULL));
	#endif
	return ret;
	}

	static int spl_fit_image_get_os(const void fit, int noffset, uint8_t os)
	{
	#if CONFIG_IS_ENABLED(FIT_IMAGE_TINY) && !defined(CONFIG_SPL_OS_BOOT)
	const char *name = fdt_getprop(fit, noffset, FIT_OS_PROP, NULL);

	if (!name)
	return -ENOENT;

	/*
	* We don't care what the type of the image actually is,
	* only whether or not it is U-Boot. This saves some
	* space by omitting the large table of OS types.
	*/
	if (!strcmp(name, "u-boot"))
	*os = IH_OS_U_BOOT;
	else
	*os = IH_OS_INVALID;

	return 0;
	#else
	return fit_image_get_os(fit, noffset, os);
	#endif
	}

	/*
	* The purpose of the FIT load buffer is to provide a memory location that is
	* independent of the load address of any FIT component.
	*/
	static void *spl_get_fit_load_buffer(size_t size)
	{
	void *buf;

	buf = malloc(size);
	if (!buf) {
	pr_err("Could not get FIT buffer of %lu bytes\n", (ulong)size);
	pr_err("\tcheck CONFIG_SYS_SPL_MALLOC_SIZE\n");
	buf = spl_get_load_buffer(0, size);
	}
	return buf;
	}

	/*
	* Weak default function to allow customizing SPL fit loading for load-only
	* use cases by allowing to skip the parsing/processing of the FIT contents
	* (so that this can be done separately in a more customized fashion)
	*/
	__weak bool spl_load_simple_fit_skip_processing(void)
	{
	return false;
	}

	int spl_load_simple_fit(struct spl_image_info *spl_image,
	struct spl_load_info info, ulong sector, void fit)
	{
	int sectors;
	ulong size, hsize;
	unsigned long count;
	struct spl_image_info image_info;
	int node = -1;
	int images, ret;
	int base_offset;
	int index = 0;
	int firmware_node;

	/*
	* For FIT with external data, figure out where the external images
	* start. This is the base for the data-offset properties in each
	* image.
	*/
	size = fdt_totalsize(fit);
	size = (size + 3) & ~3;
	size = board_spl_fit_size_align(size);
	base_offset = (size + 3) & ~3;

	/*
	* So far we only have one block of data from the FIT. Read the entire
	* thing, including that first block.
	*
	* For FIT with data embedded, data is loaded as part of FIT image.
	* For FIT with external data, data is not loaded in this step.
	*/
	sectors = get_aligned_image_size(info, size, 0);
	hsize = sectors * info->bl_len;
	fit = spl_get_fit_load_buffer(hsize);
	count = info->read(info, sector, sectors, fit);
	debug("fit read sector %lx, sectors=%d, dst=%p, count=%lu, size=0x%lx\n",
	sector, sectors, fit, count, size);

	if (count == 0)
	return -EIO;

	/* skip further processing if requested to enable load-only use cases */
	if (spl_load_simple_fit_skip_processing())
	return 0;

	if (IS_ENABLED(CONFIG_SPL_FIT_SIGNATURE)) {
	int conf_offset = fit_find_config_node(fit);

	printf("## Checking hash(es) for config %s ... ",
	fit_get_name(fit, conf_offset, NULL));
	if (fit_config_verify(fit, conf_offset))
	return -EPERM;
	puts("OK\n");
	}

	/* find the node holding the images information */
	images = fdt_path_offset(fit, FIT_IMAGES_PATH);
	if (images < 0) {
	debug("%s: Cannot find /images node: %d\n", __func__, images);
	return -1;
	}

	#ifdef CONFIG_SPL_FPGA
	node = spl_fit_get_image_node(fit, images, "fpga", 0);
	if (node >= 0) {
	/* Load the image and set up the spl_image structure */
	ret = spl_load_fit_image(info, sector, fit, base_offset, node,
	spl_image);
	if (ret) {
	printf("%s: Cannot load the FPGA: %i\n", __func__, ret);
	return ret;
	}

	debug("FPGA bitstream at: %x, size: %x\n",
	(u32)spl_image->load_addr, spl_image->size);

	ret = fpga_load(0, (const void *)spl_image->load_addr,
	spl_image->size, BIT_FULL);
	if (ret) {
	printf("%s: Cannot load the image to the FPGA\n",
	__func__);
	return ret;
	}

	puts("FPGA image loaded from FIT\n");
	node = -1;
	}
	#endif

	/*
	* Find the U-Boot image using the following search order:
	* - start at 'firmware' (e.g. an ARM Trusted Firmware)
	* - fall back 'kernel' (e.g. a Falcon-mode OS boot
	* - fall back to using the first 'loadables' entry
	*/
	if (node < 0)
	node = spl_fit_get_image_node(fit, images, FIT_FIRMWARE_PROP,
	0);
	#ifdef CONFIG_SPL_OS_BOOT
	if (node < 0)
	node = spl_fit_get_image_node(fit, images, FIT_KERNEL_PROP, 0);
	#endif
	if (node < 0) {
	debug("could not find firmware image, trying loadables...\n");
	node = spl_fit_get_image_node(fit, images, "loadables", 0);
	/*
	* If we pick the U-Boot image from "loadables", start at
	* the second image when later loading additional images.
	*/
	index = 1;
	}
	if (node < 0) {
	debug("%s: Cannot find u-boot image node: %d\n",
	__func__, node);
	return -1;
	}

	/* Load the image and set up the spl_image structure */
	ret = spl_load_fit_image(info, sector, fit, base_offset, node,
	spl_image);
	if (ret)
	return ret;

	/*
	* For backward compatibility, we treat the first node that is
	* as a U-Boot image, if no OS-type has been declared.
	*/
	if (!spl_fit_image_get_os(fit, node, &spl_image->os))
	debug("Image OS is %s\n", genimg_get_os_name(spl_image->os));
	#if !defined(CONFIG_SPL_OS_BOOT)
	else
	spl_image->os = IH_OS_U_BOOT;
	#endif

	/*
	* Booting a next-stage U-Boot may require us to append the FDT.
	* We allow this to fail, as the U-Boot image might embed its FDT.
	*/
	if (spl_image->os == IH_OS_U_BOOT) {
	ret = spl_fit_append_fdt(spl_image, info, sector, fit,
	images, base_offset);
	if (!IS_ENABLED(CONFIG_OF_EMBED) && ret < 0)
	return ret;
	}

	firmware_node = node;
	/* Now check if there are more images for us to load */
	for (; ; index++) {
	uint8_t os_type = IH_OS_INVALID;

	node = spl_fit_get_image_node(fit, images, "loadables", index);
	if (node < 0)
	break;

	/*
	* if the firmware is also a loadable, skip it because
	* it already has been loaded. This is typically the case with
	* u-boot.img generated by mkimage.
	*/
	if (firmware_node == node)
	continue;

	ret = spl_load_fit_image(info, sector, fit, base_offset, node,
	&image_info);
	if (ret < 0) {
	printf("%s: can't load image loadables index %d (ret = %d)\n",
	__func__, index, ret);
	return ret;
	}

	if (!spl_fit_image_get_os(fit, node, &os_type))
	debug("Loadable is %s\n", genimg_get_os_name(os_type));

	if (os_type == IH_OS_U_BOOT) {
	spl_fit_append_fdt(&image_info, info, sector,
	fit, images, base_offset);
	spl_image->fdt_addr = image_info.fdt_addr;
	}

	/*
	* If the "firmware" image did not provide an entry point,
	* use the first valid entry point from the loadables.
	*/
	if (spl_image->entry_point == FDT_ERROR &&
	image_info.entry_point != FDT_ERROR)
	spl_image->entry_point = image_info.entry_point;

	/* Record our loadables into the FDT */
	if (spl_image->fdt_addr)
	spl_fit_record_loadable(fit, images, index,
	spl_image->fdt_addr,
	&image_info);
	}

	/*
	* If a platform does not provide CONFIG_SYS_UBOOT_START, U-Boot's
	* Makefile will set it to 0 and it will end up as the entry point
	* here. What it actually means is: use the load address.
	*/
	if (spl_image->entry_point == FDT_ERROR \|\| spl_image->entry_point == 0)
	spl_image->entry_point = spl_image->load_addr;

	spl_image->flags \|= SPL_FIT_FOUND;

	#ifdef CONFIG_IMX_HAB
	board_spl_fit_post_load((ulong)fit, size);
	#endif

	return 0;
	}