drivers/fastboot/fb_nand.c - manifest_repos/u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2014 Broadcom Corporation.
  * Copyright 2015 Free Electrons.
  */

 #include <config.h>
 #include <common.h>

 #include <fastboot.h>
 #include <image-sparse.h>

 #include <linux/mtd/mtd.h>
 #include <jffs2/jffs2.h>
 #include <nand.h>
 #include <amlogic/storage.h>
 #include <amlogic/aml_mtd.h>
 #include <amlogic/aml_nand.h>
 #include <amlogic/aml_rsv.h>
 #include <amlogic/storage.h>
 #include <amlogic/cpu_id.h>

 struct fb_nand_sparse {
 	struct mtd_info		*mtd;
 	struct part_info	*part;
 };

 __weak int board_fastboot_erase_partition_setup(char *name)
 {
 	return 0;
 }

 __weak int board_fastboot_write_partition_setup(char *name)
 {
 	return 0;
 }

 static int fb_nand_lookup(const char *partname,
 			  struct mtd_info **mtd,
 			  struct part_info **part,
 			  char *response)
 {
 	struct mtd_device *dev;
 	int ret;
 	u8 pnum;

 	ret = mtdparts_init();
 	if (ret) {
 		pr_err("Cannot initialize MTD partitions\n");
 		fastboot_fail("cannot init mtdparts", response);
 		return ret;
 	}

 	if (strcmp(partname, "dtb") == 0)
 		return 0;
 	ret = find_dev_and_part(partname, &dev, &pnum, part);
 	if (ret) {
 		pr_err("cannot find partition: '%s'", partname);
 		fastboot_fail("cannot find partition", response);
 		return ret;
 	}

 	if (dev->id->type != MTD_DEV_TYPE_NAND) {
 		pr_err("partition '%s' is not stored on a NAND device",
 		      partname);
 		fastboot_fail("not a NAND device", response);
 		return -EINVAL;
 	}

 	*mtd = get_nand_dev_by_index(dev->id->num);

 	return 0;
 }

 static int _fb_nand_erase(struct mtd_info *mtd, struct part_info *part)
 {
 	nand_erase_options_t opts;
 	int ret;

 	memset(&opts, 0, sizeof(opts));
 	opts.offset = part->offset;
 	opts.length = part->size;
 	opts.quiet = 1;

 	printf("Erasing blocks 0x%llx to 0x%llx\n",
 	       part->offset, part->offset + part->size);

 	ret = nand_erase_opts(mtd, &opts);
 	if (ret)
 		return ret;

 	printf("........ erased 0x%llx bytes from '%s'\n",
 	       part->size, part->name);

 	return 0;
 }

 static int _fb_nand_write(struct mtd_info *mtd, struct part_info *part,
 			  void *buffer, u32 offset,
 			  size_t length, size_t *written)
 {
 	int flags = WITH_WR_VERIFY;

 #ifdef CONFIG_FASTBOOT_FLASH_NAND_TRIMFFS
 	flags |= WITH_DROP_FFS;
 #endif

 	return nand_write_skip_bad(mtd, offset, &length, written,
 				   part->size - (offset - part->offset),
 				   buffer, flags);
 }

 static lbaint_t fb_nand_sparse_write(struct sparse_storage *info,
 		lbaint_t blk, lbaint_t blkcnt, const void *buffer)
 {
 	struct fb_nand_sparse *sparse = info->priv;
 	size_t written;
 	int ret;

 	ret = _fb_nand_write(sparse->mtd, sparse->part, (void *)buffer,
 			     blk * info->blksz,
 			     blkcnt * info->blksz, &written);
 	if (ret < 0) {
 		printf("Failed to write sparse chunk\n");
 		return ret;
 	}

 /* TODO - verify that the value "written" includes the "bad-blocks" ... */

 	/*
 	 * the return value must be 'blkcnt' ("good-blocks") plus the
 	 * number of "bad-blocks" encountered within this space...
 	 */
 	return written / info->blksz;
 }

 static lbaint_t fb_nand_sparse_reserve(struct sparse_storage *info,
 		lbaint_t blk, lbaint_t blkcnt)
 {
 	int bad_blocks = 0;

 /*
  * TODO - implement a function to determine the total number
  * of blocks which must be used in order to reserve the specified
  * number ("blkcnt") of "good-blocks", starting at "blk"...
  * ( possibly something like the "check_skip_len()" function )
  */

 	/*
 	 * the return value must be 'blkcnt' ("good-blocks") plus the
 	 * number of "bad-blocks" encountered within this space...
 	 */
 	return blkcnt + bad_blocks;
 }

 /**
  * fastboot_nand_get_part_info() - Lookup NAND partion by name
  *
  * @part_name: Named device to lookup
  * @part_info: Pointer to returned part_info pointer
  * @response: Pointer to fastboot response buffer
  */
 int fastboot_nand_get_part_info(char *part_name, struct part_info **part_info,
 				char *response)
 {
 	struct mtd_info *mtd = NULL;

 	return fb_nand_lookup(part_name, &mtd, part_info, response);
 }

 int get_bootnum(struct mtd_info *mtd, size_t rwsize)
 {
 	size_t bad_blk_len_low = 0, bad_blk_len_up = 0, skip;
 	size_t aviable_space;
 	size_t block_len, block_off;
 	loff_t block_start;
 	loff_t offset = 0;
 	int ret = 1; /*inital for only one copy*/

 	if (!rwsize) { /*not need to policy call, only one */
 		ret = 1;
 		return ret;
 	}

 	/* algin with page size */
 	rwsize = ((rwsize + mtd->writesize - 1)/mtd->writesize)*mtd->writesize;

 	while (offset < mtd->size) {
 		block_start = offset & ~(loff_t)(mtd->erasesize - 1);
 		block_off = offset & (mtd->erasesize - 1);
 		block_len = mtd->erasesize - block_off;

 		if (nand_block_isbad(mtd, block_start)) {
 			if ( offset < mtd->size / 2)   /*no understand*/
 				bad_blk_len_low += block_len;
 			else if (offset > mtd->size / 2)
 				bad_blk_len_up += block_len;
 			else {
 				bad_blk_len_up = offset;
 			}
 		}
 		offset += block_len;
 	}

 	printk("rwsize:0x%zx skip_low:0x%zx skip_up:0x%zx\n",
 		rwsize, bad_blk_len_low, bad_blk_len_up);

 	skip = bad_blk_len_low + bad_blk_len_up;
 	aviable_space = mtd->size - skip - 2 * mtd->writesize; /*no understand*/

 	if (rwsize*2 <= aviable_space) {
 		ret = 1;
 		if (rwsize + mtd->writesize + bad_blk_len_low > mtd->size / 2)
 			return 1; /*1st must be write*/
 		if (rwsize + mtd->writesize + bad_blk_len_up <= mtd->size / 2)
 			ret ++;
 	} else /*needn't consider bad block length, unlikly so many bad blocks*/
 		ret = 1;

 	printk("self-adaption boot count:%d\n", ret);

 	return ret;
 }

 /**
  * fastboot_nand_flash_write() - Write image to NAND for fastboot
  *
  * @cmd: Named device to write image to
  * @download_buffer: Pointer to image data
  * @download_bytes: Size of image data
  * @response: Pointer to fastboot response buffer
  */
 void fastboot_nand_flash_write(const char *cmd, void *download_buffer,
 			       u32 download_bytes, char *response)
 {
 	struct part_info *part;
 	struct mtd_info *mtd = NULL;
 	int ret, err;
 	int copy_num = 0, i = 0;
 	u64 off = 0;
 	size_t rwsize = 0, limit = 0;

 	enum boot_type_e medium_type = store_get_type();

 	ret = fb_nand_lookup(cmd, &mtd, &part, response);
 	if (ret) {
 		pr_err("invalid NAND device");
 		fastboot_fail("invalid NAND device", response);
 		return;
 	}

 	if (strcmp(cmd, "bootloader") == 0) {
 		rwsize = download_bytes;
 		if (store_get_device_bootloader_mode() == DISCRETE_BOOTLOADER) {
 			copy_num = CONFIG_BL2_COPY_NUM;
 			limit = mtd->size / copy_num;
 		} else {
 			copy_num = get_bootnum(mtd, rwsize);
 			limit = mtd->size / copy_num;
 		}

 		for (i = 0; i < copy_num; i++) {
 			printf("off = 0x%llx,wsize = 0x%lx\n",
 				off, rwsize);
 			err = nand_write_skip_bad(mtd, off, &rwsize,
 						NULL, limit,
 						(u_char *)download_buffer, 0);
 			if (err) {
 				rwsize = download_bytes;
 				printf("bootloader write err,code = %d\n",err);
 			}
 			off += limit;
 		}
 		fastboot_okay("write bootloader", response);
 		return;
 	}

 	if (store_get_device_bootloader_mode() == DISCRETE_BOOTLOADER) {
 			if (strcmp(cmd, "tpl") == 0) {
 				if (BOOT_SNAND == medium_type ||
 				   BOOT_NAND_MTD == medium_type)
 					copy_num = CONFIG_NAND_TPL_COPY_NUM;
 				else if (medium_type == BOOT_SNOR)
 					copy_num = CONFIG_NOR_TPL_COPY_NUM;
 				rwsize = download_bytes;
 				limit = CONFIG_TPL_SIZE_PER_COPY;
 				off = 1024 * mtd->writesize +
 					NAND_RSV_BLOCK_NUM * mtd->erasesize;

 				for (i = 0; i < copy_num; i++) {
 					printf("off = 0x%llx,wsize = 0x%lx\n", off, rwsize);
 					err = nand_write_skip_bad(mtd, off, &rwsize,
 								NULL, limit,
 								(u_char *)download_buffer, 0);
 					if (err) {
 						rwsize = download_bytes;
 						printf("tpl write err,code = %d\n",err);
 					}
 					off += CONFIG_TPL_SIZE_PER_COPY;
 				}
 				fastboot_okay("write tpl", response);
 				return;
 			}
 		}

 	if (strcmp(cmd, "dtb") == 0) {
 		ret = store_rsv_write("dtb", download_bytes, (u8 *)download_buffer);
 		printf("Flashing dtb...len:0x%x\n", download_bytes);
 		if (ret) {
 			printf("write dtb fail,result code %d\n", ret);
 			fastboot_fail("write dtb", response);
 		} else {
 			fastboot_okay("write dtb", response);
 		}
 		return;
 	}

 	ret = board_fastboot_write_partition_setup(part->name);
 	if (ret)
 		return;

 	if (is_sparse_image(download_buffer)) {
 		struct fb_nand_sparse sparse_priv;
 		struct sparse_storage sparse;

 		sparse_priv.mtd = mtd;
 		sparse_priv.part = part;

 		sparse.blksz = mtd->writesize;
 		sparse.start = part->offset / sparse.blksz;
 		sparse.size = part->size / sparse.blksz;
 		sparse.write = fb_nand_sparse_write;
 		sparse.reserve = fb_nand_sparse_reserve;
 		sparse.mssg = fastboot_fail;

 		printf("Flashing sparse image at offset " LBAFU "\n",
 		       sparse.start);

 		sparse.priv = &sparse_priv;
 		ret = write_sparse_image(&sparse, cmd, download_buffer,
 					 response);
 		if (!ret)
 			fastboot_okay(NULL, response);
 	} else {
 		printf("Flashing raw image at offset 0x%llx\n",
 		       part->offset);

 		ret = _fb_nand_write(mtd, part, download_buffer, part->offset,
 				     download_bytes, NULL);

 		printf("........ wrote %u bytes to '%s'\n",
 		       download_bytes, part->name);
 	}

 	if (ret) {
 		fastboot_fail("error writing the image", response);
 		return;
 	}

 	fastboot_okay(NULL, response);
 }

 /**
  * fastboot_nand_flash_erase() - Erase NAND for fastboot
  *
  * @cmd: Named device to erase
  * @response: Pointer to fastboot response buffer
  */
 void fastboot_nand_erase(const char *cmd, char *response)
 {
 	struct part_info *part;
 	struct mtd_info *mtd = NULL;
 	int ret;

 	ret = fb_nand_lookup(cmd, &mtd, &part, response);
 	if (ret) {
 		pr_err("invalid NAND device");
 		fastboot_fail("invalid NAND device", response);
 		return;
 	}

 	if (strcmp(cmd, "dtb") == 0) {
 		ret = store_rsv_erase("dtb");
 		if (ret) {
 			pr_err("erase dtb fail,ret = %d\n", ret);
 			fastboot_fail("erase dtb",
 				response);
 		} else {
 			fastboot_okay("erase dtb", response);
 		}
 		return;
 	}

 	ret = board_fastboot_erase_partition_setup(part->name);
 	if (ret)
 		return;

 	ret = _fb_nand_erase(mtd, part);
 	if (ret) {
 		pr_err("failed erasing from device %s", mtd->name);
 		fastboot_fail("failed erasing from device", response);
 		return;
 	}

 	fastboot_okay(NULL, response);
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright 2014 Broadcom Corporation.
	* Copyright 2015 Free Electrons.
	*/

	#include <config.h>
	#include <common.h>

	#include <fastboot.h>
	#include <image-sparse.h>

	#include <linux/mtd/mtd.h>
	#include <jffs2/jffs2.h>
	#include <nand.h>
	#include <amlogic/storage.h>
	#include <amlogic/aml_mtd.h>
	#include <amlogic/aml_nand.h>
	#include <amlogic/aml_rsv.h>
	#include <amlogic/storage.h>
	#include <amlogic/cpu_id.h>

	struct fb_nand_sparse {
	struct mtd_info *mtd;
	struct part_info *part;
	};

	__weak int board_fastboot_erase_partition_setup(char *name)
	{
	return 0;
	}

	__weak int board_fastboot_write_partition_setup(char *name)
	{
	return 0;
	}

	static int fb_nand_lookup(const char *partname,
	struct mtd_info **mtd,
	struct part_info **part,
	char *response)
	{
	struct mtd_device *dev;
	int ret;
	u8 pnum;

	ret = mtdparts_init();
	if (ret) {
	pr_err("Cannot initialize MTD partitions\n");
	fastboot_fail("cannot init mtdparts", response);
	return ret;
	}

	if (strcmp(partname, "dtb") == 0)
	return 0;
	ret = find_dev_and_part(partname, &dev, &pnum, part);
	if (ret) {
	pr_err("cannot find partition: '%s'", partname);
	fastboot_fail("cannot find partition", response);
	return ret;
	}

	if (dev->id->type != MTD_DEV_TYPE_NAND) {
	pr_err("partition '%s' is not stored on a NAND device",
	partname);
	fastboot_fail("not a NAND device", response);
	return -EINVAL;
	}

	*mtd = get_nand_dev_by_index(dev->id->num);

	return 0;
	}

	static int _fb_nand_erase(struct mtd_info mtd, struct part_info part)
	{
	nand_erase_options_t opts;
	int ret;

	memset(&opts, 0, sizeof(opts));
	opts.offset = part->offset;
	opts.length = part->size;
	opts.quiet = 1;

	printf("Erasing blocks 0x%llx to 0x%llx\n",
	part->offset, part->offset + part->size);

	ret = nand_erase_opts(mtd, &opts);
	if (ret)
	return ret;

	printf("........ erased 0x%llx bytes from '%s'\n",
	part->size, part->name);

	return 0;
	}

	static int _fb_nand_write(struct mtd_info mtd, struct part_info part,
	void *buffer, u32 offset,
	size_t length, size_t *written)
	{
	int flags = WITH_WR_VERIFY;

	#ifdef CONFIG_FASTBOOT_FLASH_NAND_TRIMFFS
	flags \|= WITH_DROP_FFS;
	#endif

	return nand_write_skip_bad(mtd, offset, &length, written,
	part->size - (offset - part->offset),
	buffer, flags);
	}

	static lbaint_t fb_nand_sparse_write(struct sparse_storage *info,
	lbaint_t blk, lbaint_t blkcnt, const void *buffer)
	{
	struct fb_nand_sparse *sparse = info->priv;
	size_t written;
	int ret;

	ret = _fb_nand_write(sparse->mtd, sparse->part, (void *)buffer,
	blk * info->blksz,
	blkcnt * info->blksz, &written);
	if (ret < 0) {
	printf("Failed to write sparse chunk\n");
	return ret;
	}

	/* TODO - verify that the value "written" includes the "bad-blocks" ... */

	/*
	* the return value must be 'blkcnt' ("good-blocks") plus the
	* number of "bad-blocks" encountered within this space...
	*/
	return written / info->blksz;
	}

	static lbaint_t fb_nand_sparse_reserve(struct sparse_storage *info,
	lbaint_t blk, lbaint_t blkcnt)
	{
	int bad_blocks = 0;

	/*
	* TODO - implement a function to determine the total number
	* of blocks which must be used in order to reserve the specified
	* number ("blkcnt") of "good-blocks", starting at "blk"...
	* ( possibly something like the "check_skip_len()" function )
	*/

	/*
	* the return value must be 'blkcnt' ("good-blocks") plus the
	* number of "bad-blocks" encountered within this space...
	*/
	return blkcnt + bad_blocks;
	}

	/**
	* fastboot_nand_get_part_info() - Lookup NAND partion by name
	*
	* @part_name: Named device to lookup
	* @part_info: Pointer to returned part_info pointer
	* @response: Pointer to fastboot response buffer
	*/
	int fastboot_nand_get_part_info(char part_name, struct part_info *part_info,
	char *response)
	{
	struct mtd_info *mtd = NULL;

	return fb_nand_lookup(part_name, &mtd, part_info, response);
	}

	int get_bootnum(struct mtd_info *mtd, size_t rwsize)
	{
	size_t bad_blk_len_low = 0, bad_blk_len_up = 0, skip;
	size_t aviable_space;
	size_t block_len, block_off;
	loff_t block_start;
	loff_t offset = 0;
	int ret = 1; /inital for only one copy/

	if (!rwsize) { /not need to policy call, only one /
	ret = 1;
	return ret;
	}

	/* algin with page size */
	rwsize = ((rwsize + mtd->writesize - 1)/mtd->writesize)*mtd->writesize;

	while (offset < mtd->size) {
	block_start = offset & ~(loff_t)(mtd->erasesize - 1);
	block_off = offset & (mtd->erasesize - 1);
	block_len = mtd->erasesize - block_off;

	if (nand_block_isbad(mtd, block_start)) {
	if ( offset < mtd->size / 2) /no understand/
	bad_blk_len_low += block_len;
	else if (offset > mtd->size / 2)
	bad_blk_len_up += block_len;
	else {
	bad_blk_len_up = offset;
	}
	}
	offset += block_len;
	}

	printk("rwsize:0x%zx skip_low:0x%zx skip_up:0x%zx\n",
	rwsize, bad_blk_len_low, bad_blk_len_up);

	skip = bad_blk_len_low + bad_blk_len_up;
	aviable_space = mtd->size - skip - 2 * mtd->writesize; /no understand/

	if (rwsize*2 <= aviable_space) {
	ret = 1;
	if (rwsize + mtd->writesize + bad_blk_len_low > mtd->size / 2)
	return 1; /1st must be write/
	if (rwsize + mtd->writesize + bad_blk_len_up <= mtd->size / 2)
	ret ++;
	} else /needn't consider bad block length, unlikly so many bad blocks/
	ret = 1;

	printk("self-adaption boot count:%d\n", ret);

	return ret;
	}

	/**
	* fastboot_nand_flash_write() - Write image to NAND for fastboot
	*
	* @cmd: Named device to write image to
	* @download_buffer: Pointer to image data
	* @download_bytes: Size of image data
	* @response: Pointer to fastboot response buffer
	*/
	void fastboot_nand_flash_write(const char cmd, void download_buffer,
	u32 download_bytes, char *response)
	{
	struct part_info *part;
	struct mtd_info *mtd = NULL;
	int ret, err;
	int copy_num = 0, i = 0;
	u64 off = 0;
	size_t rwsize = 0, limit = 0;

	enum boot_type_e medium_type = store_get_type();

	ret = fb_nand_lookup(cmd, &mtd, &part, response);
	if (ret) {
	pr_err("invalid NAND device");
	fastboot_fail("invalid NAND device", response);
	return;
	}

	if (strcmp(cmd, "bootloader") == 0) {
	rwsize = download_bytes;
	if (store_get_device_bootloader_mode() == DISCRETE_BOOTLOADER) {
	copy_num = CONFIG_BL2_COPY_NUM;
	limit = mtd->size / copy_num;
	} else {
	copy_num = get_bootnum(mtd, rwsize);
	limit = mtd->size / copy_num;
	}

	for (i = 0; i < copy_num; i++) {
	printf("off = 0x%llx,wsize = 0x%lx\n",
	off, rwsize);
	err = nand_write_skip_bad(mtd, off, &rwsize,
	NULL, limit,
	(u_char *)download_buffer, 0);
	if (err) {
	rwsize = download_bytes;
	printf("bootloader write err,code = %d\n",err);
	}
	off += limit;
	}
	fastboot_okay("write bootloader", response);
	return;
	}

	if (store_get_device_bootloader_mode() == DISCRETE_BOOTLOADER) {
	if (strcmp(cmd, "tpl") == 0) {
	if (BOOT_SNAND == medium_type \|\|
	BOOT_NAND_MTD == medium_type)
	copy_num = CONFIG_NAND_TPL_COPY_NUM;
	else if (medium_type == BOOT_SNOR)
	copy_num = CONFIG_NOR_TPL_COPY_NUM;
	rwsize = download_bytes;
	limit = CONFIG_TPL_SIZE_PER_COPY;
	off = 1024 * mtd->writesize +
	NAND_RSV_BLOCK_NUM * mtd->erasesize;

	for (i = 0; i < copy_num; i++) {
	printf("off = 0x%llx,wsize = 0x%lx\n", off, rwsize);
	err = nand_write_skip_bad(mtd, off, &rwsize,
	NULL, limit,
	(u_char *)download_buffer, 0);
	if (err) {
	rwsize = download_bytes;
	printf("tpl write err,code = %d\n",err);
	}
	off += CONFIG_TPL_SIZE_PER_COPY;
	}
	fastboot_okay("write tpl", response);
	return;
	}
	}

	if (strcmp(cmd, "dtb") == 0) {
	ret = store_rsv_write("dtb", download_bytes, (u8 *)download_buffer);
	printf("Flashing dtb...len:0x%x\n", download_bytes);
	if (ret) {
	printf("write dtb fail,result code %d\n", ret);
	fastboot_fail("write dtb", response);
	} else {
	fastboot_okay("write dtb", response);
	}
	return;
	}

	ret = board_fastboot_write_partition_setup(part->name);
	if (ret)
	return;

	if (is_sparse_image(download_buffer)) {
	struct fb_nand_sparse sparse_priv;
	struct sparse_storage sparse;

	sparse_priv.mtd = mtd;
	sparse_priv.part = part;

	sparse.blksz = mtd->writesize;
	sparse.start = part->offset / sparse.blksz;
	sparse.size = part->size / sparse.blksz;
	sparse.write = fb_nand_sparse_write;
	sparse.reserve = fb_nand_sparse_reserve;
	sparse.mssg = fastboot_fail;

	printf("Flashing sparse image at offset " LBAFU "\n",
	sparse.start);

	sparse.priv = &sparse_priv;
	ret = write_sparse_image(&sparse, cmd, download_buffer,
	response);
	if (!ret)
	fastboot_okay(NULL, response);
	} else {
	printf("Flashing raw image at offset 0x%llx\n",
	part->offset);

	ret = _fb_nand_write(mtd, part, download_buffer, part->offset,
	download_bytes, NULL);

	printf("........ wrote %u bytes to '%s'\n",
	download_bytes, part->name);
	}

	if (ret) {
	fastboot_fail("error writing the image", response);
	return;
	}

	fastboot_okay(NULL, response);
	}

	/**
	* fastboot_nand_flash_erase() - Erase NAND for fastboot
	*
	* @cmd: Named device to erase
	* @response: Pointer to fastboot response buffer
	*/
	void fastboot_nand_erase(const char cmd, char response)
	{
	struct part_info *part;
	struct mtd_info *mtd = NULL;
	int ret;

	ret = fb_nand_lookup(cmd, &mtd, &part, response);
	if (ret) {
	pr_err("invalid NAND device");
	fastboot_fail("invalid NAND device", response);
	return;
	}

	if (strcmp(cmd, "dtb") == 0) {
	ret = store_rsv_erase("dtb");
	if (ret) {
	pr_err("erase dtb fail,ret = %d\n", ret);
	fastboot_fail("erase dtb",
	response);
	} else {
	fastboot_okay("erase dtb", response);
	}
	return;
	}

	ret = board_fastboot_erase_partition_setup(part->name);
	if (ret)
	return;

	ret = _fb_nand_erase(mtd, part);
	if (ret) {
	pr_err("failed erasing from device %s", mtd->name);
	fastboot_fail("failed erasing from device", response);
	return;
	}

	fastboot_okay(NULL, response);
	}