plat/st/common/bl2_io_storage.c - filogic/atf - Gitiles

 /*
  * Copyright (c) 2015-2023, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #include <assert.h>
 #include <string.h>

 #include <arch_helpers.h>
 #include <common/debug.h>
 #include <common/desc_image_load.h>
 #include <drivers/fwu/fwu.h>
 #include <drivers/fwu/fwu_metadata.h>
 #include <drivers/io/io_block.h>
 #include <drivers/io/io_driver.h>
 #include <drivers/io/io_encrypted.h>
 #include <drivers/io/io_fip.h>
 #include <drivers/io/io_memmap.h>
 #include <drivers/io/io_mtd.h>
 #include <drivers/io/io_storage.h>
 #include <drivers/mmc.h>
 #include <drivers/partition/efi.h>
 #include <drivers/partition/partition.h>
 #include <drivers/raw_nand.h>
 #include <drivers/spi_nand.h>
 #include <drivers/spi_nor.h>
 #include <drivers/st/stm32_fmc2_nand.h>
 #include <drivers/st/stm32_qspi.h>
 #include <drivers/st/stm32_sdmmc2.h>
 #include <drivers/usb_device.h>
 #include <lib/fconf/fconf.h>
 #include <lib/mmio.h>
 #include <lib/utils.h>
 #include <plat/common/platform.h>
 #include <tools_share/firmware_image_package.h>

 #include <platform_def.h>
 #include <stm32cubeprogrammer.h>
 #include <stm32mp_efi.h>
 #include <stm32mp_fconf_getter.h>
 #include <stm32mp_io_storage.h>
 #include <usb_dfu.h>

 /* IO devices */
 uintptr_t fip_dev_handle;
 uintptr_t storage_dev_handle;

 static const io_dev_connector_t *fip_dev_con;

 #ifndef DECRYPTION_SUPPORT_none
 static const io_dev_connector_t *enc_dev_con;
 uintptr_t enc_dev_handle;
 #endif

 #if STM32MP_SDMMC || STM32MP_EMMC
 static struct mmc_device_info mmc_info;

 static uint32_t block_buffer[MMC_BLOCK_SIZE] __aligned(MMC_BLOCK_SIZE);

 static io_block_dev_spec_t mmc_block_dev_spec = {
 	/* It's used as temp buffer in block driver */
 	.buffer = {
 		.offset = (size_t)&block_buffer,
 		.length = MMC_BLOCK_SIZE,
 	},
 	.ops = {
 		.read = mmc_read_blocks,
 		.write = NULL,
 	},
 	.block_size = MMC_BLOCK_SIZE,
 };

 static const io_dev_connector_t *mmc_dev_con;
 #endif /* STM32MP_SDMMC || STM32MP_EMMC */

 #if STM32MP_SPI_NOR
 static io_mtd_dev_spec_t spi_nor_dev_spec = {
 	.ops = {
 		.init = spi_nor_init,
 		.read = spi_nor_read,
 	},
 };
 #endif

 #if STM32MP_RAW_NAND
 static io_mtd_dev_spec_t nand_dev_spec = {
 	.ops = {
 		.init = nand_raw_init,
 		.read = nand_read,
 		.seek = nand_seek_bb
 	},
 };

 static const io_dev_connector_t *nand_dev_con;
 #endif

 #if STM32MP_SPI_NAND
 static io_mtd_dev_spec_t spi_nand_dev_spec = {
 	.ops = {
 		.init = spi_nand_init,
 		.read = nand_read,
 		.seek = nand_seek_bb
 	},
 };
 #endif

 #if STM32MP_SPI_NAND || STM32MP_SPI_NOR
 static const io_dev_connector_t *spi_dev_con;
 #endif

 #if STM32MP_UART_PROGRAMMER || STM32MP_USB_PROGRAMMER
 static const io_dev_connector_t *memmap_dev_con;
 #endif

 io_block_spec_t image_block_spec = {
 	.offset = 0U,
 	.length = 0U,
 };

 int open_fip(const uintptr_t spec)
 {
 	return io_dev_init(fip_dev_handle, (uintptr_t)FIP_IMAGE_ID);
 }

 #ifndef DECRYPTION_SUPPORT_none
 int open_enc_fip(const uintptr_t spec)
 {
 	int result;
 	uintptr_t local_image_handle;

 	result = io_dev_init(enc_dev_handle, (uintptr_t)ENC_IMAGE_ID);
 	if (result != 0) {
 		return result;
 	}

 	result = io_open(enc_dev_handle, spec, &local_image_handle);
 	if (result != 0) {
 		return result;
 	}

 	VERBOSE("Using encrypted FIP\n");
 	io_close(local_image_handle);

 	return 0;
 }
 #endif

 int open_storage(const uintptr_t spec)
 {
 	return io_dev_init(storage_dev_handle, 0);
 }

 #if STM32MP_EMMC_BOOT
 static uint32_t get_boot_part_fip_header(void)
 {
 	io_block_spec_t emmc_boot_fip_block_spec = {
 		.offset = STM32MP_EMMC_BOOT_FIP_OFFSET,
 		.length = MMC_BLOCK_SIZE, /* We are interested only in first 4 bytes */
 	};
 	uint32_t magic = 0U;
 	int io_result;
 	size_t bytes_read;
 	uintptr_t fip_hdr_handle;

 	io_result = io_open(storage_dev_handle, (uintptr_t)&emmc_boot_fip_block_spec,
 			    &fip_hdr_handle);
 	assert(io_result == 0);

 	io_result = io_read(fip_hdr_handle, (uintptr_t)&magic, sizeof(magic),
 			    &bytes_read);
 	if ((io_result != 0) || (bytes_read != sizeof(magic))) {
 		panic();
 	}

 	io_close(fip_hdr_handle);

 	VERBOSE("%s: eMMC boot magic at offset 256K: %08x\n",
 		__func__, magic);

 	return magic;
 }
 #endif

 static void print_boot_device(boot_api_context_t *boot_context)
 {
 	switch (boot_context->boot_interface_selected) {
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_SD:
 		INFO("Using SDMMC\n");
 		break;
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_EMMC:
 		INFO("Using EMMC\n");
 		break;
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NOR_QSPI:
 		INFO("Using QSPI NOR\n");
 		break;
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_FMC:
 		INFO("Using FMC NAND\n");
 		break;
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_QSPI:
 		INFO("Using SPI NAND\n");
 		break;
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_UART:
 		INFO("Using UART\n");
 		break;
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_USB:
 		INFO("Using USB\n");
 		break;
 	default:
 		ERROR("Boot interface %u not found\n",
 		      boot_context->boot_interface_selected);
 		panic();
 		break;
 	}

 	if (boot_context->boot_interface_instance != 0U) {
 		INFO("  Instance %d\n", boot_context->boot_interface_instance);
 	}
 }

 #if STM32MP_SDMMC || STM32MP_EMMC
 static void boot_mmc(enum mmc_device_type mmc_dev_type,
 		     uint16_t boot_interface_instance)
 {
 	int io_result __maybe_unused;
 	struct stm32_sdmmc2_params params;

 	zeromem(&params, sizeof(struct stm32_sdmmc2_params));

 	mmc_info.mmc_dev_type = mmc_dev_type;

 	switch (boot_interface_instance) {
 	case 1:
 		params.reg_base = STM32MP_SDMMC1_BASE;
 		break;
 	case 2:
 		params.reg_base = STM32MP_SDMMC2_BASE;
 		break;
 	case 3:
 		params.reg_base = STM32MP_SDMMC3_BASE;
 		break;
 	default:
 		WARN("SDMMC instance not found, using default\n");
 		if (mmc_dev_type == MMC_IS_SD) {
 			params.reg_base = STM32MP_SDMMC1_BASE;
 		} else {
 			params.reg_base = STM32MP_SDMMC2_BASE;
 		}
 		break;
 	}

 	if (mmc_dev_type != MMC_IS_EMMC) {
 		params.flags = MMC_FLAG_SD_CMD6;
 	}

 	params.device_info = &mmc_info;
 	if (stm32_sdmmc2_mmc_init(&params) != 0) {
 		ERROR("SDMMC%u init failed\n", boot_interface_instance);
 		panic();
 	}

 	/* Open MMC as a block device to read FIP */
 	io_result = register_io_dev_block(&mmc_dev_con);
 	if (io_result != 0) {
 		panic();
 	}

 	io_result = io_dev_open(mmc_dev_con, (uintptr_t)&mmc_block_dev_spec,
 				&storage_dev_handle);
 	assert(io_result == 0);

 #if STM32MP_EMMC_BOOT
 	if (mmc_dev_type == MMC_IS_EMMC) {
 		io_result = mmc_part_switch_current_boot();
 		assert(io_result == 0);

 		if (get_boot_part_fip_header() != TOC_HEADER_NAME) {
 			WARN("%s: Can't find FIP header on eMMC boot partition. Trying GPT\n",
 			     __func__);
 			io_result = mmc_part_switch_user();
 			assert(io_result == 0);
 			return;
 		}

 		VERBOSE("%s: FIP header found on eMMC boot partition\n",
 			__func__);
 		image_block_spec.offset = STM32MP_EMMC_BOOT_FIP_OFFSET;
 		image_block_spec.length = mmc_boot_part_size() - STM32MP_EMMC_BOOT_FIP_OFFSET;
 	}
 #endif
 }
 #endif /* STM32MP_SDMMC || STM32MP_EMMC */

 #if STM32MP_SPI_NOR
 static void boot_spi_nor(boot_api_context_t *boot_context)
 {
 	int io_result __maybe_unused;

 	io_result = stm32_qspi_init();
 	assert(io_result == 0);

 	io_result = register_io_dev_mtd(&spi_dev_con);
 	assert(io_result == 0);

 	/* Open connections to device */
 	io_result = io_dev_open(spi_dev_con,
 				(uintptr_t)&spi_nor_dev_spec,
 				&storage_dev_handle);
 	assert(io_result == 0);
 }
 #endif /* STM32MP_SPI_NOR */

 #if STM32MP_RAW_NAND
 static void boot_fmc2_nand(boot_api_context_t *boot_context)
 {
 	int io_result __maybe_unused;

 	io_result = stm32_fmc2_init();
 	assert(io_result == 0);

 	/* Register the IO device on this platform */
 	io_result = register_io_dev_mtd(&nand_dev_con);
 	assert(io_result == 0);

 	/* Open connections to device */
 	io_result = io_dev_open(nand_dev_con, (uintptr_t)&nand_dev_spec,
 				&storage_dev_handle);
 	assert(io_result == 0);
 }
 #endif /* STM32MP_RAW_NAND */

 #if STM32MP_SPI_NAND
 static void boot_spi_nand(boot_api_context_t *boot_context)
 {
 	int io_result __maybe_unused;

 	io_result = stm32_qspi_init();
 	assert(io_result == 0);

 	io_result = register_io_dev_mtd(&spi_dev_con);
 	assert(io_result == 0);

 	/* Open connections to device */
 	io_result = io_dev_open(spi_dev_con,
 				(uintptr_t)&spi_nand_dev_spec,
 				&storage_dev_handle);
 	assert(io_result == 0);
 }
 #endif /* STM32MP_SPI_NAND */

 #if STM32MP_UART_PROGRAMMER || STM32MP_USB_PROGRAMMER
 static void mmap_io_setup(void)
 {
 	int io_result __maybe_unused;

 	io_result = register_io_dev_memmap(&memmap_dev_con);
 	assert(io_result == 0);

 	io_result = io_dev_open(memmap_dev_con, (uintptr_t)NULL,
 				&storage_dev_handle);
 	assert(io_result == 0);
 }

 #if STM32MP_UART_PROGRAMMER
 static void stm32cubeprogrammer_uart(void)
 {
 	int ret __maybe_unused;
 	boot_api_context_t *boot_context =
 		(boot_api_context_t *)stm32mp_get_boot_ctx_address();
 	uintptr_t uart_base;

 	uart_base = get_uart_address(boot_context->boot_interface_instance);
 	ret = stm32cubeprog_uart_load(uart_base, DWL_BUFFER_BASE, DWL_BUFFER_SIZE);
 	assert(ret == 0);
 }
 #endif

 #if STM32MP_USB_PROGRAMMER
 static void stm32cubeprogrammer_usb(void)
 {
 	int ret __maybe_unused;
 	struct usb_handle *pdev;

 	/* Init USB on platform */
 	pdev = usb_dfu_plat_init();

 	ret = stm32cubeprog_usb_load(pdev, DWL_BUFFER_BASE, DWL_BUFFER_SIZE);
 	assert(ret == 0);
 }
 #endif
 #endif /* STM32MP_UART_PROGRAMMER || STM32MP_USB_PROGRAMMER */

 void stm32mp_io_setup(void)
 {
 	int io_result __maybe_unused;
 	boot_api_context_t *boot_context =
 		(boot_api_context_t *)stm32mp_get_boot_ctx_address();

 	print_boot_device(boot_context);

 	if ((boot_context->boot_partition_used_toboot == 1U) ||
 	    (boot_context->boot_partition_used_toboot == 2U)) {
 		INFO("Boot used partition fsbl%u\n",
 		     boot_context->boot_partition_used_toboot);
 	}

 	io_result = register_io_dev_fip(&fip_dev_con);
 	assert(io_result == 0);

 	io_result = io_dev_open(fip_dev_con, (uintptr_t)NULL,
 				&fip_dev_handle);

 #ifndef DECRYPTION_SUPPORT_none
 	io_result = register_io_dev_enc(&enc_dev_con);
 	assert(io_result == 0);

 	io_result = io_dev_open(enc_dev_con, (uintptr_t)NULL,
 				&enc_dev_handle);
 	assert(io_result == 0);
 #endif

 	switch (boot_context->boot_interface_selected) {
 #if STM32MP_SDMMC
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_SD:
 		dmbsy();
 		boot_mmc(MMC_IS_SD, boot_context->boot_interface_instance);
 		break;
 #endif
 #if STM32MP_EMMC
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_EMMC:
 		dmbsy();
 		boot_mmc(MMC_IS_EMMC, boot_context->boot_interface_instance);
 		break;
 #endif
 #if STM32MP_SPI_NOR
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NOR_QSPI:
 		dmbsy();
 		boot_spi_nor(boot_context);
 		break;
 #endif
 #if STM32MP_RAW_NAND
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_FMC:
 		dmbsy();
 		boot_fmc2_nand(boot_context);
 		break;
 #endif
 #if STM32MP_SPI_NAND
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_QSPI:
 		dmbsy();
 		boot_spi_nand(boot_context);
 		break;
 #endif
 #if STM32MP_UART_PROGRAMMER || STM32MP_USB_PROGRAMMER
 #if STM32MP_UART_PROGRAMMER
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_UART:
 #endif
 #if STM32MP_USB_PROGRAMMER
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_USB:
 #endif
 		dmbsy();
 		mmap_io_setup();
 		break;
 #endif

 	default:
 		ERROR("Boot interface %d not supported\n",
 		      boot_context->boot_interface_selected);
 		panic();
 		break;
 	}
 }

 int bl2_plat_handle_pre_image_load(unsigned int image_id)
 {
 	static bool gpt_init_done __maybe_unused;
 	uint16_t boot_itf = stm32mp_get_boot_itf_selected();

 	switch (boot_itf) {
 #if STM32MP_SDMMC || STM32MP_EMMC
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_EMMC:
 #if STM32MP_EMMC_BOOT
 		if (image_block_spec.offset == STM32MP_EMMC_BOOT_FIP_OFFSET) {
 			break;
 		}
 #endif
 		/* fallthrough */
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_SD:
 		if (!gpt_init_done) {
 /*
  * With FWU Multi Bank feature enabled, the selection of
  * the image to boot will be done by fwu_init calling the
  * platform hook, plat_fwu_set_images_source.
  */
 #if !PSA_FWU_SUPPORT
 			const partition_entry_t *entry;
 			const struct efi_guid img_type_guid = STM32MP_FIP_GUID;
 			uuid_t img_type_uuid;

 			guidcpy(&img_type_uuid, &img_type_guid);
 			partition_init(GPT_IMAGE_ID);
 			entry = get_partition_entry_by_type(&img_type_uuid);
 			if (entry == NULL) {
 				entry = get_partition_entry(FIP_IMAGE_NAME);
 				if (entry == NULL) {
 					ERROR("Could NOT find the %s partition!\n",
 					      FIP_IMAGE_NAME);

 					return -ENOENT;
 				}
 			}

 			image_block_spec.offset = entry->start;
 			image_block_spec.length = entry->length;
 #endif
 			gpt_init_done = true;
 		} else {
 			bl_mem_params_node_t *bl_mem_params = get_bl_mem_params_node(image_id);

 			assert(bl_mem_params != NULL);

 			mmc_block_dev_spec.buffer.offset = bl_mem_params->image_info.image_base;
 			mmc_block_dev_spec.buffer.length = bl_mem_params->image_info.image_max_size;
 		}

 		break;
 #endif

 #if STM32MP_RAW_NAND || STM32MP_SPI_NAND
 #if STM32MP_RAW_NAND
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_FMC:
 #endif
 #if STM32MP_SPI_NAND
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_QSPI:
 #endif
 		image_block_spec.offset = STM32MP_NAND_FIP_OFFSET;
 		break;
 #endif

 #if STM32MP_SPI_NOR
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NOR_QSPI:
 /*
  * With FWU Multi Bank feature enabled, the selection of
  * the image to boot will be done by fwu_init calling the
  * platform hook, plat_fwu_set_images_source.
  */
 #if !PSA_FWU_SUPPORT
 		image_block_spec.offset = STM32MP_NOR_FIP_OFFSET;
 #endif
 		break;
 #endif

 #if STM32MP_UART_PROGRAMMER
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_UART:
 		if (image_id == FW_CONFIG_ID) {
 			stm32cubeprogrammer_uart();
 			/* FIP loaded at DWL address */
 			image_block_spec.offset = DWL_BUFFER_BASE;
 			image_block_spec.length = DWL_BUFFER_SIZE;
 		}
 		break;
 #endif
 #if STM32MP_USB_PROGRAMMER
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_USB:
 		if (image_id == FW_CONFIG_ID) {
 			stm32cubeprogrammer_usb();
 			/* FIP loaded at DWL address */
 			image_block_spec.offset = DWL_BUFFER_BASE;
 			image_block_spec.length = DWL_BUFFER_SIZE;
 		}
 		break;
 #endif

 	default:
 		ERROR("FIP Not found\n");
 		panic();
 	}

 	return 0;
 }

 /*
  * Return an IO device handle and specification which can be used to access
  * an image. Use this to enforce platform load policy.
  */
 int plat_get_image_source(unsigned int image_id, uintptr_t *dev_handle,
 			  uintptr_t *image_spec)
 {
 	int rc;
 	const struct plat_io_policy *policy;

 	policy = FCONF_GET_PROPERTY(stm32mp, io_policies, image_id);
 	rc = policy->check(policy->image_spec);
 	if (rc == 0) {
 		*image_spec = policy->image_spec;
 		*dev_handle = *(policy->dev_handle);
 	}

 	return rc;
 }

 #if (STM32MP_SDMMC || STM32MP_EMMC || STM32MP_SPI_NOR) && PSA_FWU_SUPPORT
 /*
  * In each boot in non-trial mode, we set the BKP register to
  * FWU_MAX_TRIAL_REBOOT, and return the active_index from metadata.
  *
  * As long as the update agent didn't update the "accepted" field in metadata
  * (i.e. we are in trial mode), we select the new active_index.
  * To avoid infinite boot loop at trial boot we decrement a BKP register.
  * If this counter is 0:
  *     - an unexpected TAMPER event raised (that resets the BKP registers to 0)
  *     - a power-off occurs before the update agent was able to update the
  *       "accepted' field
  *     - we already boot FWU_MAX_TRIAL_REBOOT times in trial mode.
  * we select the previous_active_index.
  */
 #define INVALID_BOOT_IDX		0xFFFFFFFFU

 uint32_t plat_fwu_get_boot_idx(void)
 {
 	/*
 	 * Select boot index and update boot counter only once per boot
 	 * even if this function is called several times.
 	 */
 	static uint32_t boot_idx = INVALID_BOOT_IDX;
 	const struct fwu_metadata *data;

 	data = fwu_get_metadata();

 	if (boot_idx == INVALID_BOOT_IDX) {
 		boot_idx = data->active_index;
 		if (fwu_is_trial_run_state()) {
 			if (stm32_get_and_dec_fwu_trial_boot_cnt() == 0U) {
 				WARN("Trial FWU fails %u times\n",
 				     FWU_MAX_TRIAL_REBOOT);
 				boot_idx = data->previous_active_index;
 			}
 		} else {
 			stm32_set_max_fwu_trial_boot_cnt();
 		}
 	}

 	return boot_idx;
 }

 static void *stm32_get_image_spec(const uuid_t *img_type_uuid)
 {
 	unsigned int i;

 	for (i = 0U; i < MAX_NUMBER_IDS; i++) {
 		if ((guidcmp(&policies[i].img_type_guid, img_type_uuid)) == 0) {
 			return (void *)policies[i].image_spec;
 		}
 	}

 	return NULL;
 }

 void plat_fwu_set_images_source(const struct fwu_metadata *metadata)
 {
 	unsigned int i;
 	uint32_t boot_idx;
 	const partition_entry_t *entry __maybe_unused;
 	const uuid_t *img_type_uuid;
 	const uuid_t *img_uuid __maybe_unused;
 	io_block_spec_t *image_spec;
 	const uint16_t boot_itf = stm32mp_get_boot_itf_selected();

 	boot_idx = plat_fwu_get_boot_idx();
 	assert(boot_idx < NR_OF_FW_BANKS);

 	for (i = 0U; i < NR_OF_IMAGES_IN_FW_BANK; i++) {
 		img_type_uuid = &metadata->img_entry[i].img_type_uuid;

 		img_uuid = &metadata->img_entry[i].img_props[boot_idx].img_uuid;

 		image_spec = stm32_get_image_spec(img_type_uuid);
 		if (image_spec == NULL) {
 			ERROR("Unable to get image spec for the image in the metadata\n");
 			panic();
 		}

 		switch (boot_itf) {
 #if (STM32MP_SDMMC || STM32MP_EMMC)
 		case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_SD:
 		case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_EMMC:
 			entry = get_partition_entry_by_uuid(img_uuid);
 			if (entry == NULL) {
 				ERROR("No partition with the uuid mentioned in metadata\n");
 				panic();
 			}

 			image_spec->offset = entry->start;
 			image_spec->length = entry->length;
 			break;
 #endif
 #if STM32MP_SPI_NOR
 		case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NOR_QSPI:
 			if (guidcmp(img_uuid, &STM32MP_NOR_FIP_A_GUID) == 0) {
 				image_spec->offset = STM32MP_NOR_FIP_A_OFFSET;
 			} else if (guidcmp(img_uuid, &STM32MP_NOR_FIP_B_GUID) == 0) {
 				image_spec->offset = STM32MP_NOR_FIP_B_OFFSET;
 			} else {
 				ERROR("Invalid uuid mentioned in metadata\n");
 				panic();
 			}
 			break;
 #endif
 		default:
 			panic();
 			break;
 		}
 	}
 }

 static int plat_set_image_source(unsigned int image_id,
 				 uintptr_t *handle,
 				 uintptr_t *image_spec)
 {
 	struct plat_io_policy *policy;
 	io_block_spec_t *spec __maybe_unused;
 	const partition_entry_t *entry __maybe_unused;
 	const uint16_t boot_itf = stm32mp_get_boot_itf_selected();

 	policy = &policies[image_id];
 	spec = (io_block_spec_t *)policy->image_spec;

 	switch (boot_itf) {
 #if (STM32MP_SDMMC || STM32MP_EMMC)
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_SD:
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_EMMC:
 		partition_init(GPT_IMAGE_ID);

 		if (image_id == FWU_METADATA_IMAGE_ID) {
 			entry = get_partition_entry(METADATA_PART_1);
 		} else {
 			entry = get_partition_entry(METADATA_PART_2);
 		}

 		if (entry == NULL) {
 			ERROR("Unable to find a metadata partition\n");
 			return -ENOENT;
 		}

 		spec->offset = entry->start;
 		spec->length = entry->length;
 		break;
 #endif

 #if STM32MP_SPI_NOR
 	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NOR_QSPI:
 		if (image_id == FWU_METADATA_IMAGE_ID) {
 			spec->offset = STM32MP_NOR_METADATA1_OFFSET;
 		} else {
 			spec->offset = STM32MP_NOR_METADATA2_OFFSET;
 		}

 		spec->length = sizeof(struct fwu_metadata);
 		break;
 #endif
 	default:
 		panic();
 		break;
 	}

 	*image_spec = policy->image_spec;
 	*handle = *policy->dev_handle;

 	return 0;
 }

 int plat_fwu_set_metadata_image_source(unsigned int image_id,
 				       uintptr_t *handle,
 				       uintptr_t *image_spec)
 {
 	assert((image_id == FWU_METADATA_IMAGE_ID) ||
 	       (image_id == BKUP_FWU_METADATA_IMAGE_ID));

 	return plat_set_image_source(image_id, handle, image_spec);
 }
 #endif /* (STM32MP_SDMMC || STM32MP_EMMC || STM32MP_SPI_NOR) && PSA_FWU_SUPPORT */
	/*
	* Copyright (c) 2015-2023, Arm Limited and Contributors. All rights reserved.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#include <assert.h>
	#include <string.h>

	#include <arch_helpers.h>
	#include <common/debug.h>
	#include <common/desc_image_load.h>
	#include <drivers/fwu/fwu.h>
	#include <drivers/fwu/fwu_metadata.h>
	#include <drivers/io/io_block.h>
	#include <drivers/io/io_driver.h>
	#include <drivers/io/io_encrypted.h>
	#include <drivers/io/io_fip.h>
	#include <drivers/io/io_memmap.h>
	#include <drivers/io/io_mtd.h>
	#include <drivers/io/io_storage.h>
	#include <drivers/mmc.h>
	#include <drivers/partition/efi.h>
	#include <drivers/partition/partition.h>
	#include <drivers/raw_nand.h>
	#include <drivers/spi_nand.h>
	#include <drivers/spi_nor.h>
	#include <drivers/st/stm32_fmc2_nand.h>
	#include <drivers/st/stm32_qspi.h>
	#include <drivers/st/stm32_sdmmc2.h>
	#include <drivers/usb_device.h>
	#include <lib/fconf/fconf.h>
	#include <lib/mmio.h>
	#include <lib/utils.h>
	#include <plat/common/platform.h>
	#include <tools_share/firmware_image_package.h>

	#include <platform_def.h>
	#include <stm32cubeprogrammer.h>
	#include <stm32mp_efi.h>
	#include <stm32mp_fconf_getter.h>
	#include <stm32mp_io_storage.h>
	#include <usb_dfu.h>

	/* IO devices */
	uintptr_t fip_dev_handle;
	uintptr_t storage_dev_handle;

	static const io_dev_connector_t *fip_dev_con;

	#ifndef DECRYPTION_SUPPORT_none
	static const io_dev_connector_t *enc_dev_con;
	uintptr_t enc_dev_handle;
	#endif

	#if STM32MP_SDMMC \|\| STM32MP_EMMC
	static struct mmc_device_info mmc_info;

	static uint32_t block_buffer[MMC_BLOCK_SIZE] __aligned(MMC_BLOCK_SIZE);

	static io_block_dev_spec_t mmc_block_dev_spec = {
	/* It's used as temp buffer in block driver */
	.buffer = {
	.offset = (size_t)&block_buffer,
	.length = MMC_BLOCK_SIZE,
	},
	.ops = {
	.read = mmc_read_blocks,
	.write = NULL,
	},
	.block_size = MMC_BLOCK_SIZE,
	};

	static const io_dev_connector_t *mmc_dev_con;
	#endif /* STM32MP_SDMMC \|\| STM32MP_EMMC */

	#if STM32MP_SPI_NOR
	static io_mtd_dev_spec_t spi_nor_dev_spec = {
	.ops = {
	.init = spi_nor_init,
	.read = spi_nor_read,
	},
	};
	#endif

	#if STM32MP_RAW_NAND
	static io_mtd_dev_spec_t nand_dev_spec = {
	.ops = {
	.init = nand_raw_init,
	.read = nand_read,
	.seek = nand_seek_bb
	},
	};

	static const io_dev_connector_t *nand_dev_con;
	#endif

	#if STM32MP_SPI_NAND
	static io_mtd_dev_spec_t spi_nand_dev_spec = {
	.ops = {
	.init = spi_nand_init,
	.read = nand_read,
	.seek = nand_seek_bb
	},
	};
	#endif

	#if STM32MP_SPI_NAND \|\| STM32MP_SPI_NOR
	static const io_dev_connector_t *spi_dev_con;
	#endif

	#if STM32MP_UART_PROGRAMMER \|\| STM32MP_USB_PROGRAMMER
	static const io_dev_connector_t *memmap_dev_con;
	#endif

	io_block_spec_t image_block_spec = {
	.offset = 0U,
	.length = 0U,
	};

	int open_fip(const uintptr_t spec)
	{
	return io_dev_init(fip_dev_handle, (uintptr_t)FIP_IMAGE_ID);
	}

	#ifndef DECRYPTION_SUPPORT_none
	int open_enc_fip(const uintptr_t spec)
	{
	int result;
	uintptr_t local_image_handle;

	result = io_dev_init(enc_dev_handle, (uintptr_t)ENC_IMAGE_ID);
	if (result != 0) {
	return result;
	}

	result = io_open(enc_dev_handle, spec, &local_image_handle);
	if (result != 0) {
	return result;
	}

	VERBOSE("Using encrypted FIP\n");
	io_close(local_image_handle);

	return 0;
	}
	#endif

	int open_storage(const uintptr_t spec)
	{
	return io_dev_init(storage_dev_handle, 0);
	}

	#if STM32MP_EMMC_BOOT
	static uint32_t get_boot_part_fip_header(void)
	{
	io_block_spec_t emmc_boot_fip_block_spec = {
	.offset = STM32MP_EMMC_BOOT_FIP_OFFSET,
	.length = MMC_BLOCK_SIZE, /* We are interested only in first 4 bytes */
	};
	uint32_t magic = 0U;
	int io_result;
	size_t bytes_read;
	uintptr_t fip_hdr_handle;

	io_result = io_open(storage_dev_handle, (uintptr_t)&emmc_boot_fip_block_spec,
	&fip_hdr_handle);
	assert(io_result == 0);

	io_result = io_read(fip_hdr_handle, (uintptr_t)&magic, sizeof(magic),
	&bytes_read);
	if ((io_result != 0) \|\| (bytes_read != sizeof(magic))) {
	panic();
	}

	io_close(fip_hdr_handle);

	VERBOSE("%s: eMMC boot magic at offset 256K: %08x\n",
	__func__, magic);

	return magic;
	}
	#endif

	static void print_boot_device(boot_api_context_t *boot_context)
	{
	switch (boot_context->boot_interface_selected) {
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_SD:
	INFO("Using SDMMC\n");
	break;
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_EMMC:
	INFO("Using EMMC\n");
	break;
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NOR_QSPI:
	INFO("Using QSPI NOR\n");
	break;
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_FMC:
	INFO("Using FMC NAND\n");
	break;
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_QSPI:
	INFO("Using SPI NAND\n");
	break;
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_UART:
	INFO("Using UART\n");
	break;
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_USB:
	INFO("Using USB\n");
	break;
	default:
	ERROR("Boot interface %u not found\n",
	boot_context->boot_interface_selected);
	panic();
	break;
	}

	if (boot_context->boot_interface_instance != 0U) {
	INFO(" Instance %d\n", boot_context->boot_interface_instance);
	}
	}

	#if STM32MP_SDMMC \|\| STM32MP_EMMC
	static void boot_mmc(enum mmc_device_type mmc_dev_type,
	uint16_t boot_interface_instance)
	{
	int io_result __maybe_unused;
	struct stm32_sdmmc2_params params;

	zeromem(&params, sizeof(struct stm32_sdmmc2_params));

	mmc_info.mmc_dev_type = mmc_dev_type;

	switch (boot_interface_instance) {
	case 1:
	params.reg_base = STM32MP_SDMMC1_BASE;
	break;
	case 2:
	params.reg_base = STM32MP_SDMMC2_BASE;
	break;
	case 3:
	params.reg_base = STM32MP_SDMMC3_BASE;
	break;
	default:
	WARN("SDMMC instance not found, using default\n");
	if (mmc_dev_type == MMC_IS_SD) {
	params.reg_base = STM32MP_SDMMC1_BASE;
	} else {
	params.reg_base = STM32MP_SDMMC2_BASE;
	}
	break;
	}

	if (mmc_dev_type != MMC_IS_EMMC) {
	params.flags = MMC_FLAG_SD_CMD6;
	}

	params.device_info = &mmc_info;
	if (stm32_sdmmc2_mmc_init(&params) != 0) {
	ERROR("SDMMC%u init failed\n", boot_interface_instance);
	panic();
	}

	/* Open MMC as a block device to read FIP */
	io_result = register_io_dev_block(&mmc_dev_con);
	if (io_result != 0) {
	panic();
	}

	io_result = io_dev_open(mmc_dev_con, (uintptr_t)&mmc_block_dev_spec,
	&storage_dev_handle);
	assert(io_result == 0);

	#if STM32MP_EMMC_BOOT
	if (mmc_dev_type == MMC_IS_EMMC) {
	io_result = mmc_part_switch_current_boot();
	assert(io_result == 0);

	if (get_boot_part_fip_header() != TOC_HEADER_NAME) {
	WARN("%s: Can't find FIP header on eMMC boot partition. Trying GPT\n",
	__func__);
	io_result = mmc_part_switch_user();
	assert(io_result == 0);
	return;
	}

	VERBOSE("%s: FIP header found on eMMC boot partition\n",
	__func__);
	image_block_spec.offset = STM32MP_EMMC_BOOT_FIP_OFFSET;
	image_block_spec.length = mmc_boot_part_size() - STM32MP_EMMC_BOOT_FIP_OFFSET;
	}
	#endif
	}
	#endif /* STM32MP_SDMMC \|\| STM32MP_EMMC */

	#if STM32MP_SPI_NOR
	static void boot_spi_nor(boot_api_context_t *boot_context)
	{
	int io_result __maybe_unused;

	io_result = stm32_qspi_init();
	assert(io_result == 0);

	io_result = register_io_dev_mtd(&spi_dev_con);
	assert(io_result == 0);

	/* Open connections to device */
	io_result = io_dev_open(spi_dev_con,
	(uintptr_t)&spi_nor_dev_spec,
	&storage_dev_handle);
	assert(io_result == 0);
	}
	#endif /* STM32MP_SPI_NOR */

	#if STM32MP_RAW_NAND
	static void boot_fmc2_nand(boot_api_context_t *boot_context)
	{
	int io_result __maybe_unused;

	io_result = stm32_fmc2_init();
	assert(io_result == 0);

	/* Register the IO device on this platform */
	io_result = register_io_dev_mtd(&nand_dev_con);
	assert(io_result == 0);

	/* Open connections to device */
	io_result = io_dev_open(nand_dev_con, (uintptr_t)&nand_dev_spec,
	&storage_dev_handle);
	assert(io_result == 0);
	}
	#endif /* STM32MP_RAW_NAND */

	#if STM32MP_SPI_NAND
	static void boot_spi_nand(boot_api_context_t *boot_context)
	{
	int io_result __maybe_unused;

	io_result = stm32_qspi_init();
	assert(io_result == 0);

	io_result = register_io_dev_mtd(&spi_dev_con);
	assert(io_result == 0);

	/* Open connections to device */
	io_result = io_dev_open(spi_dev_con,
	(uintptr_t)&spi_nand_dev_spec,
	&storage_dev_handle);
	assert(io_result == 0);
	}
	#endif /* STM32MP_SPI_NAND */

	#if STM32MP_UART_PROGRAMMER \|\| STM32MP_USB_PROGRAMMER
	static void mmap_io_setup(void)
	{
	int io_result __maybe_unused;

	io_result = register_io_dev_memmap(&memmap_dev_con);
	assert(io_result == 0);

	io_result = io_dev_open(memmap_dev_con, (uintptr_t)NULL,
	&storage_dev_handle);
	assert(io_result == 0);
	}

	#if STM32MP_UART_PROGRAMMER
	static void stm32cubeprogrammer_uart(void)
	{
	int ret __maybe_unused;
	boot_api_context_t *boot_context =
	(boot_api_context_t *)stm32mp_get_boot_ctx_address();
	uintptr_t uart_base;

	uart_base = get_uart_address(boot_context->boot_interface_instance);
	ret = stm32cubeprog_uart_load(uart_base, DWL_BUFFER_BASE, DWL_BUFFER_SIZE);
	assert(ret == 0);
	}
	#endif

	#if STM32MP_USB_PROGRAMMER
	static void stm32cubeprogrammer_usb(void)
	{
	int ret __maybe_unused;
	struct usb_handle *pdev;

	/* Init USB on platform */
	pdev = usb_dfu_plat_init();

	ret = stm32cubeprog_usb_load(pdev, DWL_BUFFER_BASE, DWL_BUFFER_SIZE);
	assert(ret == 0);
	}
	#endif
	#endif /* STM32MP_UART_PROGRAMMER \|\| STM32MP_USB_PROGRAMMER */

	void stm32mp_io_setup(void)
	{
	int io_result __maybe_unused;
	boot_api_context_t *boot_context =
	(boot_api_context_t *)stm32mp_get_boot_ctx_address();

	print_boot_device(boot_context);

	if ((boot_context->boot_partition_used_toboot == 1U) \|\|
	(boot_context->boot_partition_used_toboot == 2U)) {
	INFO("Boot used partition fsbl%u\n",
	boot_context->boot_partition_used_toboot);
	}

	io_result = register_io_dev_fip(&fip_dev_con);
	assert(io_result == 0);

	io_result = io_dev_open(fip_dev_con, (uintptr_t)NULL,
	&fip_dev_handle);

	#ifndef DECRYPTION_SUPPORT_none
	io_result = register_io_dev_enc(&enc_dev_con);
	assert(io_result == 0);

	io_result = io_dev_open(enc_dev_con, (uintptr_t)NULL,
	&enc_dev_handle);
	assert(io_result == 0);
	#endif

	switch (boot_context->boot_interface_selected) {
	#if STM32MP_SDMMC
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_SD:
	dmbsy();
	boot_mmc(MMC_IS_SD, boot_context->boot_interface_instance);
	break;
	#endif
	#if STM32MP_EMMC
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_EMMC:
	dmbsy();
	boot_mmc(MMC_IS_EMMC, boot_context->boot_interface_instance);
	break;
	#endif
	#if STM32MP_SPI_NOR
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NOR_QSPI:
	dmbsy();
	boot_spi_nor(boot_context);
	break;
	#endif
	#if STM32MP_RAW_NAND
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_FMC:
	dmbsy();
	boot_fmc2_nand(boot_context);
	break;
	#endif
	#if STM32MP_SPI_NAND
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_QSPI:
	dmbsy();
	boot_spi_nand(boot_context);
	break;
	#endif
	#if STM32MP_UART_PROGRAMMER \|\| STM32MP_USB_PROGRAMMER
	#if STM32MP_UART_PROGRAMMER
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_UART:
	#endif
	#if STM32MP_USB_PROGRAMMER
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_USB:
	#endif
	dmbsy();
	mmap_io_setup();
	break;
	#endif

	default:
	ERROR("Boot interface %d not supported\n",
	boot_context->boot_interface_selected);
	panic();
	break;
	}
	}

	int bl2_plat_handle_pre_image_load(unsigned int image_id)
	{
	static bool gpt_init_done __maybe_unused;
	uint16_t boot_itf = stm32mp_get_boot_itf_selected();

	switch (boot_itf) {
	#if STM32MP_SDMMC \|\| STM32MP_EMMC
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_EMMC:
	#if STM32MP_EMMC_BOOT
	if (image_block_spec.offset == STM32MP_EMMC_BOOT_FIP_OFFSET) {
	break;
	}
	#endif
	/* fallthrough */
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_SD:
	if (!gpt_init_done) {
	/*
	* With FWU Multi Bank feature enabled, the selection of
	* the image to boot will be done by fwu_init calling the
	* platform hook, plat_fwu_set_images_source.
	*/
	#if !PSA_FWU_SUPPORT
	const partition_entry_t *entry;
	const struct efi_guid img_type_guid = STM32MP_FIP_GUID;
	uuid_t img_type_uuid;

	guidcpy(&img_type_uuid, &img_type_guid);
	partition_init(GPT_IMAGE_ID);
	entry = get_partition_entry_by_type(&img_type_uuid);
	if (entry == NULL) {
	entry = get_partition_entry(FIP_IMAGE_NAME);
	if (entry == NULL) {
	ERROR("Could NOT find the %s partition!\n",
	FIP_IMAGE_NAME);

	return -ENOENT;
	}
	}

	image_block_spec.offset = entry->start;
	image_block_spec.length = entry->length;
	#endif
	gpt_init_done = true;
	} else {
	bl_mem_params_node_t *bl_mem_params = get_bl_mem_params_node(image_id);

	assert(bl_mem_params != NULL);

	mmc_block_dev_spec.buffer.offset = bl_mem_params->image_info.image_base;
	mmc_block_dev_spec.buffer.length = bl_mem_params->image_info.image_max_size;
	}

	break;
	#endif

	#if STM32MP_RAW_NAND \|\| STM32MP_SPI_NAND
	#if STM32MP_RAW_NAND
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_FMC:
	#endif
	#if STM32MP_SPI_NAND
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NAND_QSPI:
	#endif
	image_block_spec.offset = STM32MP_NAND_FIP_OFFSET;
	break;
	#endif

	#if STM32MP_SPI_NOR
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NOR_QSPI:
	/*
	* With FWU Multi Bank feature enabled, the selection of
	* the image to boot will be done by fwu_init calling the
	* platform hook, plat_fwu_set_images_source.
	*/
	#if !PSA_FWU_SUPPORT
	image_block_spec.offset = STM32MP_NOR_FIP_OFFSET;
	#endif
	break;
	#endif

	#if STM32MP_UART_PROGRAMMER
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_UART:
	if (image_id == FW_CONFIG_ID) {
	stm32cubeprogrammer_uart();
	/* FIP loaded at DWL address */
	image_block_spec.offset = DWL_BUFFER_BASE;
	image_block_spec.length = DWL_BUFFER_SIZE;
	}
	break;
	#endif
	#if STM32MP_USB_PROGRAMMER
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_USB:
	if (image_id == FW_CONFIG_ID) {
	stm32cubeprogrammer_usb();
	/* FIP loaded at DWL address */
	image_block_spec.offset = DWL_BUFFER_BASE;
	image_block_spec.length = DWL_BUFFER_SIZE;
	}
	break;
	#endif

	default:
	ERROR("FIP Not found\n");
	panic();
	}

	return 0;
	}

	/*
	* Return an IO device handle and specification which can be used to access
	* an image. Use this to enforce platform load policy.
	*/
	int plat_get_image_source(unsigned int image_id, uintptr_t *dev_handle,
	uintptr_t *image_spec)
	{
	int rc;
	const struct plat_io_policy *policy;

	policy = FCONF_GET_PROPERTY(stm32mp, io_policies, image_id);
	rc = policy->check(policy->image_spec);
	if (rc == 0) {
	*image_spec = policy->image_spec;
	dev_handle = (policy->dev_handle);
	}

	return rc;
	}

	#if (STM32MP_SDMMC \|\| STM32MP_EMMC \|\| STM32MP_SPI_NOR) && PSA_FWU_SUPPORT
	/*
	* In each boot in non-trial mode, we set the BKP register to
	* FWU_MAX_TRIAL_REBOOT, and return the active_index from metadata.
	*
	* As long as the update agent didn't update the "accepted" field in metadata
	* (i.e. we are in trial mode), we select the new active_index.
	* To avoid infinite boot loop at trial boot we decrement a BKP register.
	* If this counter is 0:
	* - an unexpected TAMPER event raised (that resets the BKP registers to 0)
	* - a power-off occurs before the update agent was able to update the
	* "accepted' field
	* - we already boot FWU_MAX_TRIAL_REBOOT times in trial mode.
	* we select the previous_active_index.
	*/
	#define INVALID_BOOT_IDX 0xFFFFFFFFU

	uint32_t plat_fwu_get_boot_idx(void)
	{
	/*
	* Select boot index and update boot counter only once per boot
	* even if this function is called several times.
	*/
	static uint32_t boot_idx = INVALID_BOOT_IDX;
	const struct fwu_metadata *data;

	data = fwu_get_metadata();

	if (boot_idx == INVALID_BOOT_IDX) {
	boot_idx = data->active_index;
	if (fwu_is_trial_run_state()) {
	if (stm32_get_and_dec_fwu_trial_boot_cnt() == 0U) {
	WARN("Trial FWU fails %u times\n",
	FWU_MAX_TRIAL_REBOOT);
	boot_idx = data->previous_active_index;
	}
	} else {
	stm32_set_max_fwu_trial_boot_cnt();
	}
	}

	return boot_idx;
	}

	static void stm32_get_image_spec(const uuid_t img_type_uuid)
	{
	unsigned int i;

	for (i = 0U; i < MAX_NUMBER_IDS; i++) {
	if ((guidcmp(&policies[i].img_type_guid, img_type_uuid)) == 0) {
	return (void *)policies[i].image_spec;
	}
	}

	return NULL;
	}

	void plat_fwu_set_images_source(const struct fwu_metadata *metadata)
	{
	unsigned int i;
	uint32_t boot_idx;
	const partition_entry_t *entry __maybe_unused;
	const uuid_t *img_type_uuid;
	const uuid_t *img_uuid __maybe_unused;
	io_block_spec_t *image_spec;
	const uint16_t boot_itf = stm32mp_get_boot_itf_selected();

	boot_idx = plat_fwu_get_boot_idx();
	assert(boot_idx < NR_OF_FW_BANKS);

	for (i = 0U; i < NR_OF_IMAGES_IN_FW_BANK; i++) {
	img_type_uuid = &metadata->img_entry[i].img_type_uuid;

	img_uuid = &metadata->img_entry[i].img_props[boot_idx].img_uuid;

	image_spec = stm32_get_image_spec(img_type_uuid);
	if (image_spec == NULL) {
	ERROR("Unable to get image spec for the image in the metadata\n");
	panic();
	}

	switch (boot_itf) {
	#if (STM32MP_SDMMC \|\| STM32MP_EMMC)
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_SD:
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_EMMC:
	entry = get_partition_entry_by_uuid(img_uuid);
	if (entry == NULL) {
	ERROR("No partition with the uuid mentioned in metadata\n");
	panic();
	}

	image_spec->offset = entry->start;
	image_spec->length = entry->length;
	break;
	#endif
	#if STM32MP_SPI_NOR
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NOR_QSPI:
	if (guidcmp(img_uuid, &STM32MP_NOR_FIP_A_GUID) == 0) {
	image_spec->offset = STM32MP_NOR_FIP_A_OFFSET;
	} else if (guidcmp(img_uuid, &STM32MP_NOR_FIP_B_GUID) == 0) {
	image_spec->offset = STM32MP_NOR_FIP_B_OFFSET;
	} else {
	ERROR("Invalid uuid mentioned in metadata\n");
	panic();
	}
	break;
	#endif
	default:
	panic();
	break;
	}
	}
	}

	static int plat_set_image_source(unsigned int image_id,
	uintptr_t *handle,
	uintptr_t *image_spec)
	{
	struct plat_io_policy *policy;
	io_block_spec_t *spec __maybe_unused;
	const partition_entry_t *entry __maybe_unused;
	const uint16_t boot_itf = stm32mp_get_boot_itf_selected();

	policy = &policies[image_id];
	spec = (io_block_spec_t *)policy->image_spec;

	switch (boot_itf) {
	#if (STM32MP_SDMMC \|\| STM32MP_EMMC)
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_SD:
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_EMMC:
	partition_init(GPT_IMAGE_ID);

	if (image_id == FWU_METADATA_IMAGE_ID) {
	entry = get_partition_entry(METADATA_PART_1);
	} else {
	entry = get_partition_entry(METADATA_PART_2);
	}

	if (entry == NULL) {
	ERROR("Unable to find a metadata partition\n");
	return -ENOENT;
	}

	spec->offset = entry->start;
	spec->length = entry->length;
	break;
	#endif

	#if STM32MP_SPI_NOR
	case BOOT_API_CTX_BOOT_INTERFACE_SEL_FLASH_NOR_QSPI:
	if (image_id == FWU_METADATA_IMAGE_ID) {
	spec->offset = STM32MP_NOR_METADATA1_OFFSET;
	} else {
	spec->offset = STM32MP_NOR_METADATA2_OFFSET;
	}

	spec->length = sizeof(struct fwu_metadata);
	break;
	#endif
	default:
	panic();
	break;
	}

	*image_spec = policy->image_spec;
	handle = policy->dev_handle;

	return 0;
	}

	int plat_fwu_set_metadata_image_source(unsigned int image_id,
	uintptr_t *handle,
	uintptr_t *image_spec)
	{
	assert((image_id == FWU_METADATA_IMAGE_ID) \|\|
	(image_id == BKUP_FWU_METADATA_IMAGE_ID));

	return plat_set_image_source(image_id, handle, image_spec);
	}
	#endif /* (STM32MP_SDMMC \|\| STM32MP_EMMC \|\| STM32MP_SPI_NOR) && PSA_FWU_SUPPORT */