common/fb_mmc.c - u-boot - Git at Google

 /*
  * Copyright 2014 Broadcom Corporation.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <config.h>
 #include <common.h>
 #include <emmc_partitions.h>
 #include <fb_mmc.h>
 #include <part.h>
 #include <aboot.h>
 #include <sparse_format.h>
 #include <mmc.h>
 #include <fb_fastboot.h>
 #include <amlogic/aml_mmc.h>
 #include <amlogic/storage_if.h>
 #include <lz4_wrapper.h>

 #ifndef CONFIG_FASTBOOT_GPT_NAME
 #define CONFIG_FASTBOOT_GPT_NAME GPT_ENTRY_NAME
 #endif

 #ifndef CONFIG_FASTBOOT_MBR_NAME
 #define CONFIG_FASTBOOT_MBR_NAME "mbr"
 #endif


 /* The 64 defined bytes plus the '\0' */
 struct fb_mmc_sparse {
 	block_dev_desc_t	*dev_desc;
 };
 #ifdef CONFIG_EFI_PARTITION
 static int part_get_info_efi_by_name_or_alias(block_dev_desc_t *dev_desc,
 		const char *name, disk_partition_t *info)
 {
 	int ret;

 	ret = get_partition_info_efi_by_name(dev_desc, name, info);
 	if (ret) {
 		/* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
 		char env_alias_name[25 + 32 + 1];
 		char *aliased_part_name;

 		/* check for alias */
 		strcpy(env_alias_name, "fastboot_partition_alias_");
 		strncat(env_alias_name, name, 32);
 		aliased_part_name = getenv(env_alias_name);
 		if (aliased_part_name != NULL)
 			ret = get_partition_info_efi_by_name(dev_desc,
 					aliased_part_name, info);
 	}
 	return ret;
 }
 #endif

 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
 		lbaint_t blk, lbaint_t blkcnt, const void *buffer)
 {
 	struct fb_mmc_sparse *sparse = info->priv;
 	block_dev_desc_t *dev_desc = sparse->dev_desc;

 	return dev_desc->block_write(dev_desc->dev, blk, blkcnt,
 				     buffer);
 }

 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
 		lbaint_t blk, lbaint_t blkcnt)
 {
 	return blkcnt;
 }

 static void write_raw_image(block_dev_desc_t *dev_desc, disk_partition_t *info,
 		const char *part_name, void *buffer,
 		unsigned int download_bytes)
 {
 	lbaint_t blkcnt;
 	lbaint_t blks;

 	/* determine number of blocks to write */
 	blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
 	blkcnt = blkcnt / info->blksz;

 	if (blkcnt > info->size) {
 		error("too large for partition: '%s'\n", part_name);
 		fastboot_fail("too large for partition");
 		return;
 	}

 	puts("Flashing Raw Image\n");

 	blks = dev_desc->block_write(dev_desc->dev, info->start, blkcnt,
 				     buffer);
 	if (blks != blkcnt) {
 		error("failed writing to device %d\n", dev_desc->dev);
 		fastboot_fail("failed writing to device");
 		return;
 	}

 	printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
 	       part_name);
 	fastboot_okay("");
 }

 // The maximum decompressed block size for lz4 is 4MB.
 static uint8_t lz4_image_decompress_buffer[4 * 1024 * 1024];

 static int write_lz4_compressed_image(disk_partition_t *info,
 				      const char *part_name,
 				      void *download_buffer,
 				      unsigned int download_bytes)
 {
 	int ret = 0;
 	struct lz4_frame_header lz4_header;
 	size_t lz4_data_offset;
 	if ((ret = check_and_extract_lz4_frame_header(
 		     download_buffer, download_bytes, &lz4_header,
 		     &lz4_data_offset))) {
 		printf("Failed to extract lz4 frame header\n");
 		return -1;
 	}

 	const uint8_t *compressed_end = download_buffer + download_bytes;
 	const uint8_t *compressed_curr =
 		(uint8_t *)download_buffer + lz4_data_offset;

 	printf("Flashing lz4 compressed image to partition %s\n", part_name);

 	size_t write_offset = 0;
 	bool has_more_data = true;
 	while (has_more_data) {
 		size_t decompressed_size = sizeof(lz4_image_decompress_buffer);
 		size_t compressed_size = compressed_end - compressed_curr;
 		if ((ret = lz4_decompress(
 			     &lz4_header, compressed_curr, &compressed_size,
 			     lz4_image_decompress_buffer, &decompressed_size,
 			     &has_more_data))) {
 			printf("Failed to decompress, %d\n", ret);
 			return -1;
 		}
 		compressed_curr += compressed_size;

 		if ((decompressed_size % info->blksz) && has_more_data) {
 			printf("Decompressed size %zu is not a multiple of "
 			       "partition block size %lu\n",
 			       decompressed_size, info->blksz);
 			return -1;
 		}

 		if (store_write_ops((unsigned char *)part_name,
 				    lz4_image_decompress_buffer, write_offset,
 				    decompressed_size)) {
 			printf("Failed to write to storage\n");
 			return -1;
 		}
 		write_offset += decompressed_size;
 	}
 	return 0;
 }

 /* erase or flash, when buffer is not NULL, it's write */
 static void fb_mmc_bootloader_ops(const char *cmd,
 			block_dev_desc_t *dev_desc, void *buffer,
 			unsigned int bytes)
 {
 	char *delim = "-";
 	char *hwpart;
 	int map = 0, ret = 0;
 	char *scmd = (char *) cmd;
 	char *ops[] = {"erase", "write"};

 	hwpart = strchr(scmd, (int)*delim);

     if (!hwpart) {
 		map = AML_BL_BOOT0 | AML_BL_BOOT1;
 	} else if (!strcmp(hwpart, "-boot0")) {
 		map = AML_BL_BOOT0;
 	} else if (!strcmp(hwpart, "-boot1")) {
 		map = AML_BL_BOOT1;
 	}
     if (map) {
 		if (buffer)
             ret = amlmmc_write_bootloader(CONFIG_FASTBOOT_FLASH_MMC_DEV, map,
 				bytes, buffer);
         else
 			ret = amlmmc_erase_bootloader(CONFIG_FASTBOOT_FLASH_MMC_DEV, map);
 		if (ret) {
 			error("failed %s %s from device %d", (buffer? ops[1]: ops[0]),
 				cmd, dev_desc->dev);
 			fastboot_fail("failed bootloader operating to device");
 			return;
 		}
 		printf("........ %s  %s\n", (buffer? ops[1]: ops[0]), cmd);
 		fastboot_okay("");
 	} else
 		fastboot_fail("failed opearting from device");
 	return;
 }

 /**
  * write bootloader on user/boot0/boot1
  * according to bootloader name.
  */
 static void fb_mmc_write_bootloader(const char *cmd,
 		block_dev_desc_t *dev_desc, void *buffer, unsigned int bytes)
 {
 	return fb_mmc_bootloader_ops(cmd, dev_desc, buffer, bytes);
 }

 /**
  * erase bootloader on user/boot0/boot1
  * according to bootloader name.
  */
 static void fb_mmc_erase_bootloader(const char *cmd, block_dev_desc_t *dev_desc)
 {
 	return fb_mmc_bootloader_ops(cmd, dev_desc, NULL, 0);
 }

 const char *partitions_override_gpt[] = {
 	MMC_BOOT_NAME,
 	MMC_BOOT_NAME0,
 	MMC_BOOT_NAME1,
 	MMC_DTB_NAME,
 };

 bool is_partition_override_gpt(const char *part)
 {
 	for (size_t i = 0; i < ARRAY_SIZE(partitions_override_gpt); i++) {
 		if (strcmp(part, partitions_override_gpt[i]) == 0) {
 			return true;
 		}
 	}
 	return false;
 }

 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
 			unsigned int download_bytes)
 {
 	block_dev_desc_t *dev_desc;
 	disk_partition_t info;
 	int ret = 0;
 	dev_desc = get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 	if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 		error("invalid mmc device\n");
 		fastboot_fail("invalid mmc device");
 		return;
 	}
 #ifdef CONFIG_EFI_PARTITION
 	if (dev_desc->part_type == PART_TYPE_EFI) {
 		if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 			printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 			       __func__);
 			if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 				printf("%s: invalid GPT - refusing to write to flash\n",
 				       __func__);
 				fastboot_fail("invalid GPT partition");
 				return;
 			}
 			if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 				printf("%s: writing GPT partitions failed\n", __func__);
 				fastboot_fail("writing GPT partitions failed");
 				return;
 			}
 			printf("........ success\n");
 			fastboot_okay("");
 			return;
 		} else if (!is_partition_override_gpt(cmd) &&
 			   get_partition_info_efi_by_name(dev_desc, cmd,
 							  &info)) {
 			error("cannot find partition: '%s'\n", cmd);
 			fastboot_fail("cannot find partition");
 			return;
 		}
 	}
 #endif

 #ifdef CONFIG_AML_PARTITION
 	if ((dev_desc->part_type == PART_TYPE_AML)
 		|| (dev_desc->part_type == PART_TYPE_DOS)
 		|| (!strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME))) {
 		if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
 			printf("%s: updating MBR\n", __func__);
 			ret = emmc_update_mbr(download_buffer);
 			if (ret)
 				fastboot_fail("fastboot update mbr fail");
 			else
 				fastboot_okay("");
 			return;
 		}
 		if (get_partition_info_aml_by_name(dev_desc, cmd, &info)) {
 			error("cannot find partition: '%s'\n", cmd);
 			fastboot_fail("cannot find partition");
 			return;
 		}
 	}
 #endif
 	if (strcmp(cmd, "dtb") == 0) {
 #ifndef DTB_BIND_KERNEL
 		ret = dtb_write(download_buffer);
 		if (ret)
 			fastboot_fail("fastboot write dtb fail");
 		else {
 			/* renew partition table @ once*/
 			if (renew_partition_tbl(download_buffer))
 				fastboot_fail("fastboot write dtb fail");
 			fastboot_okay("");
 		}
 #else
 	fastboot_fail("dtb is bind in kernel, return");
 #endif
 	} else if (!strncmp(cmd, "bootloader", strlen("bootloader"))) {
 		fb_mmc_write_bootloader(cmd, dev_desc, download_buffer, download_bytes);
 		return;
 	} else {
 		if (is_sparse_image(download_buffer)) {
 			struct fb_mmc_sparse sparse_priv;
 			struct sparse_storage sparse;

 			sparse_priv.dev_desc = dev_desc;

 			sparse.blksz = info.blksz;
 			sparse.start = info.start;
 			sparse.size = info.size;
 			sparse.write = fb_mmc_sparse_write;
 			sparse.reserve = fb_mmc_sparse_reserve;

 			printf("Flashing sparse image at offset " LBAFU "\n",
 			       sparse.start);
 			sparse.priv = &sparse_priv;
 			write_sparse_image(&sparse, cmd, download_buffer,
 					   download_bytes);
 		} else if (is_data_lz4_compressed(download_buffer, download_bytes)) {
 			if ((write_lz4_compressed_image(&info, cmd,
 							download_buffer,
 							download_bytes))) {
 				fastboot_fail(
 					"failed to write lz4 compressed image");
 			}
 			fastboot_okay("");
 		} else
 			write_raw_image(dev_desc, &info, cmd, download_buffer,
 					download_bytes);
 	}
 }

 inline lbaint_t lba_max(lbaint_t a, lbaint_t b)
 {
 	return a > b ? a : b;
 }

 void fb_mmc_erase_write(const char *cmd, void *download_buffer)
 {
 	int ret = 0;
 	block_dev_desc_t *dev_desc;
 	disk_partition_t info;
 	lbaint_t blks, blks_start, blks_size, grp_size;
 	struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);

 	if (mmc == NULL) {
 		error("invalid mmc device");
 		fastboot_fail("invalid mmc device");
 		return;
 	}

 	dev_desc = get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 	if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 		error("invalid mmc device");
 		fastboot_fail("invalid mmc device");
 		return;
 	}
 #ifdef CONFIG_EFI_PARTITION
 	if (dev_desc->part_type == PART_TYPE_EFI &&
 	    !is_partition_override_gpt(cmd))
 		ret = part_get_info_efi_by_name_or_alias(dev_desc, cmd, &info);
 #endif
 #ifdef CONFIG_AML_PARTITION
 	if ((dev_desc->part_type == PART_TYPE_AML)
 		|| (dev_desc->part_type == PART_TYPE_DOS))
 		ret = get_partition_info_aml_by_name(dev_desc, cmd, &info);
 #endif
 	if (ret) {
 		error("cannot find partition: '%s'", cmd);
 		fastboot_fail("cannot find partition");
 		return;
 	}
 	/* special operation for bootloader */
 	if (!strncmp(cmd, "bootloader", strlen("bootloader"))) {
 		fb_mmc_erase_bootloader(cmd, dev_desc);
 		return;
 	} else {
 		/* Align blocks to erase group size to avoid erasing other partitions */
 		grp_size = mmc->erase_grp_size;
 		blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 		if (info.size >= grp_size)
 			blks_size = (info.size - (blks_start - info.start)) &
 				    (~(grp_size - 1));
 		else
 			blks_size = 0;

 		lbaint_t unaligned_header_blks =
 			(info.start + info.size >= blks_start) ?
 				blks_start - info.start :
 				info.size;
 		lbaint_t unaligned_footer_blks =
 			info.size - blks_size - unaligned_header_blks;
 		lbaint_t unaligned_buffer_blks =
 			lba_max(unaligned_header_blks, unaligned_footer_blks);
 		if (unaligned_buffer_blks) {
 			size_t unaligned_buffer_size_bytes =
 				unaligned_buffer_blks * info.blksz;
 			void *unaligned_write_buffer =
 				calloc(1, unaligned_buffer_size_bytes);
 			if (unaligned_header_blks) {
 				printf("%s: writing zeroes to unaligned header starting at %lu for %lu blocks\n",
 				       __func__, info.start,
 				       unaligned_header_blks);
 				blks = dev_desc->block_write(
 					dev_desc->dev, info.start,
 					unaligned_header_blks,
 					unaligned_write_buffer);
 				if (blks != unaligned_header_blks) {
 					printf("%s: unaligned header write failed\n",
 					       __func__);
 				}
 			}
 			if (unaligned_footer_blks) {
 				lbaint_t footer_start = blks_start + blks_size;
 				printf("%s: writing zeroes to unaligned footer starting at %lu for %lu blocks\n",
 				       __func__, footer_start,
 				       unaligned_footer_blks);
 				blks = dev_desc->block_write(
 					dev_desc->dev, footer_start,
 					unaligned_footer_blks,
 					unaligned_write_buffer);
 				if (blks != unaligned_footer_blks) {
 					printf("%s: unaligned footer write failed\n",
 					       __func__);
 				}
 			}
 			free(unaligned_write_buffer);
 		}

 		printf("Erasing blocks " LBAFU " to " LBAFU
 		       " due to alignment\n",
 		       blks_start, blks_start + blks_size);
 		blks = dev_desc->block_erase(dev_desc->dev, blks_start,
 					     blks_size);
 		if (blks != 0) {
 			error("failed erasing from device %d", dev_desc->dev);
 			fastboot_fail("failed erasing from device");
 			return;
 		}

 		printf("........ erased " LBAFU " bytes from '%s'\n",
 		       blks_size * info.blksz, cmd);
 		fastboot_okay("");

 	}
 }
	/*
	* Copyright 2014 Broadcom Corporation.
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <config.h>
	#include <common.h>
	#include <emmc_partitions.h>
	#include <fb_mmc.h>
	#include <part.h>
	#include <aboot.h>
	#include <sparse_format.h>
	#include <mmc.h>
	#include <fb_fastboot.h>
	#include <amlogic/aml_mmc.h>
	#include <amlogic/storage_if.h>
	#include <lz4_wrapper.h>

	#ifndef CONFIG_FASTBOOT_GPT_NAME
	#define CONFIG_FASTBOOT_GPT_NAME GPT_ENTRY_NAME
	#endif

	#ifndef CONFIG_FASTBOOT_MBR_NAME
	#define CONFIG_FASTBOOT_MBR_NAME "mbr"
	#endif


	/* The 64 defined bytes plus the '\0' */
	struct fb_mmc_sparse {
	block_dev_desc_t *dev_desc;
	};
	#ifdef CONFIG_EFI_PARTITION
	static int part_get_info_efi_by_name_or_alias(block_dev_desc_t *dev_desc,
	const char name, disk_partition_t info)
	{
	int ret;

	ret = get_partition_info_efi_by_name(dev_desc, name, info);
	if (ret) {
	/* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
	char env_alias_name[25 + 32 + 1];
	char *aliased_part_name;

	/* check for alias */
	strcpy(env_alias_name, "fastboot_partition_alias_");
	strncat(env_alias_name, name, 32);
	aliased_part_name = getenv(env_alias_name);
	if (aliased_part_name != NULL)
	ret = get_partition_info_efi_by_name(dev_desc,
	aliased_part_name, info);
	}
	return ret;
	}
	#endif

	static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
	lbaint_t blk, lbaint_t blkcnt, const void *buffer)
	{
	struct fb_mmc_sparse *sparse = info->priv;
	block_dev_desc_t *dev_desc = sparse->dev_desc;

	return dev_desc->block_write(dev_desc->dev, blk, blkcnt,
	buffer);
	}

	static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
	lbaint_t blk, lbaint_t blkcnt)
	{
	return blkcnt;
	}

	static void write_raw_image(block_dev_desc_t dev_desc, disk_partition_t info,
	const char part_name, void buffer,
	unsigned int download_bytes)
	{
	lbaint_t blkcnt;
	lbaint_t blks;

	/* determine number of blocks to write */
	blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
	blkcnt = blkcnt / info->blksz;

	if (blkcnt > info->size) {
	error("too large for partition: '%s'\n", part_name);
	fastboot_fail("too large for partition");
	return;
	}

	puts("Flashing Raw Image\n");

	blks = dev_desc->block_write(dev_desc->dev, info->start, blkcnt,
	buffer);
	if (blks != blkcnt) {
	error("failed writing to device %d\n", dev_desc->dev);
	fastboot_fail("failed writing to device");
	return;
	}

	printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
	part_name);
	fastboot_okay("");
	}

	// The maximum decompressed block size for lz4 is 4MB.
	static uint8_t lz4_image_decompress_buffer[4 * 1024 * 1024];

	static int write_lz4_compressed_image(disk_partition_t *info,
	const char *part_name,
	void *download_buffer,
	unsigned int download_bytes)
	{
	int ret = 0;
	struct lz4_frame_header lz4_header;
	size_t lz4_data_offset;
	if ((ret = check_and_extract_lz4_frame_header(
	download_buffer, download_bytes, &lz4_header,
	&lz4_data_offset))) {
	printf("Failed to extract lz4 frame header\n");
	return -1;
	}

	const uint8_t *compressed_end = download_buffer + download_bytes;
	const uint8_t *compressed_curr =
	(uint8_t *)download_buffer + lz4_data_offset;

	printf("Flashing lz4 compressed image to partition %s\n", part_name);

	size_t write_offset = 0;
	bool has_more_data = true;
	while (has_more_data) {
	size_t decompressed_size = sizeof(lz4_image_decompress_buffer);
	size_t compressed_size = compressed_end - compressed_curr;
	if ((ret = lz4_decompress(
	&lz4_header, compressed_curr, &compressed_size,
	lz4_image_decompress_buffer, &decompressed_size,
	&has_more_data))) {
	printf("Failed to decompress, %d\n", ret);
	return -1;
	}
	compressed_curr += compressed_size;

	if ((decompressed_size % info->blksz) && has_more_data) {
	printf("Decompressed size %zu is not a multiple of "
	"partition block size %lu\n",
	decompressed_size, info->blksz);
	return -1;
	}

	if (store_write_ops((unsigned char *)part_name,
	lz4_image_decompress_buffer, write_offset,
	decompressed_size)) {
	printf("Failed to write to storage\n");
	return -1;
	}
	write_offset += decompressed_size;
	}
	return 0;
	}

	/* erase or flash, when buffer is not NULL, it's write */
	static void fb_mmc_bootloader_ops(const char *cmd,
	block_dev_desc_t dev_desc, void buffer,
	unsigned int bytes)
	{
	char *delim = "-";
	char *hwpart;
	int map = 0, ret = 0;
	char scmd = (char ) cmd;
	char *ops[] = {"erase", "write"};

	hwpart = strchr(scmd, (int)*delim);

	if (!hwpart) {
	map = AML_BL_BOOT0 \| AML_BL_BOOT1;
	} else if (!strcmp(hwpart, "-boot0")) {
	map = AML_BL_BOOT0;
	} else if (!strcmp(hwpart, "-boot1")) {
	map = AML_BL_BOOT1;
	}
	if (map) {
	if (buffer)
	ret = amlmmc_write_bootloader(CONFIG_FASTBOOT_FLASH_MMC_DEV, map,
	bytes, buffer);
	else
	ret = amlmmc_erase_bootloader(CONFIG_FASTBOOT_FLASH_MMC_DEV, map);
	if (ret) {
	error("failed %s %s from device %d", (buffer? ops[1]: ops[0]),
	cmd, dev_desc->dev);
	fastboot_fail("failed bootloader operating to device");
	return;
	}
	printf("........ %s %s\n", (buffer? ops[1]: ops[0]), cmd);
	fastboot_okay("");
	} else
	fastboot_fail("failed opearting from device");
	return;
	}

	/**
	* write bootloader on user/boot0/boot1
	* according to bootloader name.
	*/
	static void fb_mmc_write_bootloader(const char *cmd,
	block_dev_desc_t dev_desc, void buffer, unsigned int bytes)
	{
	return fb_mmc_bootloader_ops(cmd, dev_desc, buffer, bytes);
	}

	/**
	* erase bootloader on user/boot0/boot1
	* according to bootloader name.
	*/
	static void fb_mmc_erase_bootloader(const char cmd, block_dev_desc_t dev_desc)
	{
	return fb_mmc_bootloader_ops(cmd, dev_desc, NULL, 0);
	}

	const char *partitions_override_gpt[] = {
	MMC_BOOT_NAME,
	MMC_BOOT_NAME0,
	MMC_BOOT_NAME1,
	MMC_DTB_NAME,
	};

	bool is_partition_override_gpt(const char *part)
	{
	for (size_t i = 0; i < ARRAY_SIZE(partitions_override_gpt); i++) {
	if (strcmp(part, partitions_override_gpt[i]) == 0) {
	return true;
	}
	}
	return false;
	}

	void fb_mmc_flash_write(const char cmd, void download_buffer,
	unsigned int download_bytes)
	{
	block_dev_desc_t *dev_desc;
	disk_partition_t info;
	int ret = 0;
	dev_desc = get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
	if (!dev_desc \|\| dev_desc->type == DEV_TYPE_UNKNOWN) {
	error("invalid mmc device\n");
	fastboot_fail("invalid mmc device");
	return;
	}
	#ifdef CONFIG_EFI_PARTITION
	if (dev_desc->part_type == PART_TYPE_EFI) {
	if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
	printf("%s: updating MBR, Primary and Backup GPT(s)\n",
	__func__);
	if (is_valid_gpt_buf(dev_desc, download_buffer)) {
	printf("%s: invalid GPT - refusing to write to flash\n",
	__func__);
	fastboot_fail("invalid GPT partition");
	return;
	}
	if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
	printf("%s: writing GPT partitions failed\n", __func__);
	fastboot_fail("writing GPT partitions failed");
	return;
	}
	printf("........ success\n");
	fastboot_okay("");
	return;
	} else if (!is_partition_override_gpt(cmd) &&
	get_partition_info_efi_by_name(dev_desc, cmd,
	&info)) {
	error("cannot find partition: '%s'\n", cmd);
	fastboot_fail("cannot find partition");
	return;
	}
	}
	#endif

	#ifdef CONFIG_AML_PARTITION
	if ((dev_desc->part_type == PART_TYPE_AML)
	\|\| (dev_desc->part_type == PART_TYPE_DOS)
	\|\| (!strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME))) {
	if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
	printf("%s: updating MBR\n", __func__);
	ret = emmc_update_mbr(download_buffer);
	if (ret)
	fastboot_fail("fastboot update mbr fail");
	else
	fastboot_okay("");
	return;
	}
	if (get_partition_info_aml_by_name(dev_desc, cmd, &info)) {
	error("cannot find partition: '%s'\n", cmd);
	fastboot_fail("cannot find partition");
	return;
	}
	}
	#endif
	if (strcmp(cmd, "dtb") == 0) {
	#ifndef DTB_BIND_KERNEL
	ret = dtb_write(download_buffer);
	if (ret)
	fastboot_fail("fastboot write dtb fail");
	else {
	/* renew partition table @ once*/
	if (renew_partition_tbl(download_buffer))
	fastboot_fail("fastboot write dtb fail");
	fastboot_okay("");
	}
	#else
	fastboot_fail("dtb is bind in kernel, return");
	#endif
	} else if (!strncmp(cmd, "bootloader", strlen("bootloader"))) {
	fb_mmc_write_bootloader(cmd, dev_desc, download_buffer, download_bytes);
	return;
	} else {
	if (is_sparse_image(download_buffer)) {
	struct fb_mmc_sparse sparse_priv;
	struct sparse_storage sparse;

	sparse_priv.dev_desc = dev_desc;

	sparse.blksz = info.blksz;
	sparse.start = info.start;
	sparse.size = info.size;
	sparse.write = fb_mmc_sparse_write;
	sparse.reserve = fb_mmc_sparse_reserve;

	printf("Flashing sparse image at offset " LBAFU "\n",
	sparse.start);
	sparse.priv = &sparse_priv;
	write_sparse_image(&sparse, cmd, download_buffer,
	download_bytes);
	} else if (is_data_lz4_compressed(download_buffer, download_bytes)) {
	if ((write_lz4_compressed_image(&info, cmd,
	download_buffer,
	download_bytes))) {
	fastboot_fail(
	"failed to write lz4 compressed image");
	}
	fastboot_okay("");
	} else
	write_raw_image(dev_desc, &info, cmd, download_buffer,
	download_bytes);
	}
	}

	inline lbaint_t lba_max(lbaint_t a, lbaint_t b)
	{
	return a > b ? a : b;
	}

	void fb_mmc_erase_write(const char cmd, void download_buffer)
	{
	int ret = 0;
	block_dev_desc_t *dev_desc;
	disk_partition_t info;
	lbaint_t blks, blks_start, blks_size, grp_size;
	struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);

	if (mmc == NULL) {
	error("invalid mmc device");
	fastboot_fail("invalid mmc device");
	return;
	}

	dev_desc = get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
	if (!dev_desc \|\| dev_desc->type == DEV_TYPE_UNKNOWN) {
	error("invalid mmc device");
	fastboot_fail("invalid mmc device");
	return;
	}
	#ifdef CONFIG_EFI_PARTITION
	if (dev_desc->part_type == PART_TYPE_EFI &&
	!is_partition_override_gpt(cmd))
	ret = part_get_info_efi_by_name_or_alias(dev_desc, cmd, &info);
	#endif
	#ifdef CONFIG_AML_PARTITION
	if ((dev_desc->part_type == PART_TYPE_AML)
	\|\| (dev_desc->part_type == PART_TYPE_DOS))
	ret = get_partition_info_aml_by_name(dev_desc, cmd, &info);
	#endif
	if (ret) {
	error("cannot find partition: '%s'", cmd);
	fastboot_fail("cannot find partition");
	return;
	}
	/* special operation for bootloader */
	if (!strncmp(cmd, "bootloader", strlen("bootloader"))) {
	fb_mmc_erase_bootloader(cmd, dev_desc);
	return;
	} else {
	/* Align blocks to erase group size to avoid erasing other partitions */
	grp_size = mmc->erase_grp_size;
	blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
	if (info.size >= grp_size)
	blks_size = (info.size - (blks_start - info.start)) &
	(~(grp_size - 1));
	else
	blks_size = 0;

	lbaint_t unaligned_header_blks =
	(info.start + info.size >= blks_start) ?
	blks_start - info.start :
	info.size;
	lbaint_t unaligned_footer_blks =
	info.size - blks_size - unaligned_header_blks;
	lbaint_t unaligned_buffer_blks =
	lba_max(unaligned_header_blks, unaligned_footer_blks);
	if (unaligned_buffer_blks) {
	size_t unaligned_buffer_size_bytes =
	unaligned_buffer_blks * info.blksz;
	void *unaligned_write_buffer =
	calloc(1, unaligned_buffer_size_bytes);
	if (unaligned_header_blks) {
	printf("%s: writing zeroes to unaligned header starting at %lu for %lu blocks\n",
	__func__, info.start,
	unaligned_header_blks);
	blks = dev_desc->block_write(
	dev_desc->dev, info.start,
	unaligned_header_blks,
	unaligned_write_buffer);
	if (blks != unaligned_header_blks) {
	printf("%s: unaligned header write failed\n",
	__func__);
	}
	}
	if (unaligned_footer_blks) {
	lbaint_t footer_start = blks_start + blks_size;
	printf("%s: writing zeroes to unaligned footer starting at %lu for %lu blocks\n",
	__func__, footer_start,
	unaligned_footer_blks);
	blks = dev_desc->block_write(
	dev_desc->dev, footer_start,
	unaligned_footer_blks,
	unaligned_write_buffer);
	if (blks != unaligned_footer_blks) {
	printf("%s: unaligned footer write failed\n",
	__func__);
	}
	}
	free(unaligned_write_buffer);
	}

	printf("Erasing blocks " LBAFU " to " LBAFU
	" due to alignment\n",
	blks_start, blks_start + blks_size);
	blks = dev_desc->block_erase(dev_desc->dev, blks_start,
	blks_size);
	if (blks != 0) {
	error("failed erasing from device %d", dev_desc->dev);
	fastboot_fail("failed erasing from device");
	return;
	}

	printf("........ erased " LBAFU " bytes from '%s'\n",
	blks_size * info.blksz, cmd);
	fastboot_okay("");

	}
	}