cmd: nandbcb: Reconstruct the nandbcb tool for all platforms

The original nandbcb tool was designed for imx6 only, when trying to
leverage it to replace the kobs-ng tool, we found the design is not
friendly for supporting all platforms. To support all iMX6/7/8 platforms
and for easy further maintain, I reconstruct the structure of the tool.

The main changes including:

1. Use platform_data to determine the logic branches rather than simply
   use SOC name.
2. More data structures as parameter for functions.
3. Global variables to define the FCB/DBBT/FW locations.
4. Implement the kobs-ng default 4 FCB/4 DBBT/2 FW layout.
5. Support Hamming coding/ 40bit BCH/ 62bit BCH coding FCB.
6. Dump and compare all written FCB/DBBT to verify data integrity.

The tool has been verified on iMX6Q/DL, 6SX, 7D, 6ULL, iMX8QX, iMX8MM.

Signed-off-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>

1 files changed, 952 insertions, 351 deletions

diff --git a/arch/arm/mach-imx/cmd_nandbcb.c b/arch/arm/mach-imx/cmd_nandbcb.c
index a8531def35..ab12b1f1cf 100644
--- a/arch/arm/mach-imx/cmd_nandbcb.c
+++ b/arch/arm/mach-imx/cmd_nandbcb.c
@@ -1,11 +1,13 @@
 /*
- * i.MX6 nand boot control block(bcb).
+ * i.MX nand boot control block(bcb).
  *
  * Based on the common/imx-bbu-nand-fcb.c from barebox and imx kobs-ng
  *
  * Copyright (C) 2017 Jagan Teki <jagan@amarulasolutions.com>
  * Copyright (C) 2016 Sergey Kubushyn <ksi@koi8.net>
  *
+ * Reconstucted by Han Xu <han.xu@nxp.com>
+ *
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
@@ -25,24 +27,295 @@
 #include <mxs_nand.h>
 #include <linux/mtd/mtd.h>
 #include <nand.h>
-#include <div64.h>
 
 #include "../../../cmd/legacy-mtd-utils.h"
 
-#define BF_VAL(v, bf)		(((v) & bf##_MASK) >> bf##_OFFSET)
+/* FCB related flags */
+/* FCB layout with leading 12B reserved */
+#define FCB_LAYOUT_RESV_12B		BIT(0)
+/* FCB layout with leading 32B meta data */
+#define FCB_LAYOUT_META_32B		BIT(1)
+/* FCB encrypted by Hamming code */
+#define FCB_ENCODE_HAMMING		BIT(2)
+/* FCB encrypted by 40bit BCH */
+#define FCB_ENCODE_BCH_40b		BIT(3)
+/* FCB encrypted by 62bit BCH */
+#define FCB_ENCODE_BCH_62b		BIT(4)
+/* FCB encrypted by BCH */
+#define FCB_ENCODE_BCH			(FCB_ENCODE_BCH_40b | FCB_ENCODE_BCH_62b)
+/* FCB data was randomized */
+#define FCB_RANDON_ENABLED		BIT(5)
+
+/* Firmware related flags */
+/* No 1K padding */
+#define FIRMWARE_NEED_PADDING		BIT(8)
+/* Extra firmware*/
+#define FIRMWARE_EXTRA_ONE		BIT(9)
+/* Secondary firmware on fixed address */
+#define FIRMWARE_SECONDARY_FIXED_ADDR	BIT(10)
+
+/* Boot search related flags */
+#define BT_SEARCH_CNT_FROM_FUSE		BIT(16)
+
+struct platform_config {
+	int misc_flags;
+};
+
+static struct platform_config plat_config;
+
+/* imx6q/dl/solo */
+static struct platform_config imx6qdl_plat_config = {
+	.misc_flags = FCB_LAYOUT_RESV_12B |
+		     FCB_ENCODE_HAMMING |
+		     FIRMWARE_NEED_PADDING,
+};
+
+static struct platform_config imx6sx_plat_config = {
+	.misc_flags = FCB_LAYOUT_META_32B |
+		     FCB_ENCODE_BCH_62b |
+		     FIRMWARE_NEED_PADDING |
+		     FCB_RANDON_ENABLED,
+};
+
+static struct platform_config imx7d_plat_config = {
+	.misc_flags = FCB_LAYOUT_META_32B |
+		     FCB_ENCODE_BCH_62b |
+		     FIRMWARE_NEED_PADDING |
+		     FCB_RANDON_ENABLED,
+};
+
+/* imx6ul/ull/ulz */
+static struct platform_config imx6ul_plat_config = {
+	.misc_flags = FCB_LAYOUT_META_32B |
+		     FCB_ENCODE_BCH_40b |
+		     FIRMWARE_NEED_PADDING,
+};
+
+static struct platform_config imx8mq_plat_config = {
+	.misc_flags = FCB_LAYOUT_META_32B |
+		     FCB_ENCODE_BCH_62b |
+		     FIRMWARE_NEED_PADDING |
+		     FCB_RANDON_ENABLED |
+		     FIRMWARE_EXTRA_ONE,
+};
+
+/* all other imx8mm */
+static struct platform_config imx8mm_plat_config = {
+	.misc_flags = FCB_LAYOUT_META_32B |
+		     FCB_ENCODE_BCH_62b |
+		     FIRMWARE_NEED_PADDING |
+		     FCB_RANDON_ENABLED,
+};
+
+/* imx8mn */
+static struct platform_config imx8mn_plat_config = {
+	.misc_flags = FCB_LAYOUT_META_32B |
+		     FCB_ENCODE_BCH_62b |
+		     FCB_RANDON_ENABLED |
+		     FIRMWARE_SECONDARY_FIXED_ADDR |
+		     BT_SEARCH_CNT_FROM_FUSE,
+};
+
+/* imx8qx/qm */
+static struct platform_config imx8q_plat_config = {
+	.misc_flags = FCB_LAYOUT_META_32B |
+		     FCB_ENCODE_BCH_62b |
+		     FCB_RANDON_ENABLED |
+		     FIRMWARE_SECONDARY_FIXED_ADDR |
+		     BT_SEARCH_CNT_FROM_FUSE,
+};
+
+/* boot search related variables and definitions */
+static int g_boot_search_count = 4;
+static int g_boot_search_stride;
+static int g_pages_per_stride;
+
+/* mtd config structure */
+struct boot_config {
+	int dev;
+	struct mtd_info *mtd;
+	loff_t maxsize;
+	loff_t input_size;
+	loff_t offset;
+	loff_t boot_stream1_address;
+	loff_t boot_stream2_address;
+	size_t boot_stream1_size;
+	size_t boot_stream2_size;
+	size_t max_boot_stream_size;
+	int stride_size_in_byte;
+	int search_area_size_in_bytes;
+	int search_area_size_in_pages;
+	int secondary_boot_stream_off_in_MB;
+};
+
+/* boot_stream config structure */
+struct boot_stream_config {
+	char bs_label[32];
+	loff_t bs_addr;
+	size_t bs_size;
+	void *bs_buf;
+	loff_t next_bs_addr;
+	bool need_padding;
+};
+
+/* FW index */
+#define FW1_ONLY	1
+#define FW2_ONLY	2
+#define FW_ALL		FW1_ONLY | FW2_ONLY
+#define FW_INX(x)	(1 << (x))
+
+/* NAND convert macros */
+#define CONV_TO_PAGES(x)	((u32)(x) / (u32)(mtd->writesize))
+#define CONV_TO_BLOCKS(x)	((u32)(x) / (u32)(mtd->erasesize))
+
 #define GETBIT(v, n)		(((v) >> (n)) & 0x1)
 #define IMX8MQ_SPL_SZ 0x3e000
 #define IMX8MQ_HDMI_FW_SZ 0x19c00
-#define BOOT_SEARCH_COUNT 2
 
-struct mtd_info *dump_mtd;
-static loff_t dump_nandboot_size;
-static struct fcb_block dump_fill_fcb;
-static struct dbbt_block dump_fill_dbbt;
-static struct fcb_block dump_nand_fcb[BOOT_SEARCH_COUNT];
-static struct dbbt_block dump_nand_dbbt[BOOT_SEARCH_COUNT];
-static u32 dump_fcb_off[BOOT_SEARCH_COUNT];
-static u32 dump_dbbt_off[BOOT_SEARCH_COUNT];
+static int nandbcb_get_info(int argc, char * const argv[],
+			    struct boot_config *boot_cfg)
+{
+	int dev;
+	struct mtd_info *mtd;
+
+	dev = nand_curr_device;
+	if (dev < 0) {
+		printf("failed to get nand_curr_device, run nand device\n");
+		return CMD_RET_FAILURE;
+	}
+
+	mtd = get_nand_dev_by_index(dev);
+	if (!mtd) {
+		printf("failed to get mtd info\n");
+		return CMD_RET_FAILURE;
+	}
+
+	boot_cfg->dev = dev;
+	boot_cfg->mtd = mtd;
+
+	return CMD_RET_SUCCESS;
+}
+
+static int nandbcb_get_size(int argc, char * const argv[], int num,
+			    struct boot_config *boot_cfg)
+{
+	int dev;
+	loff_t offset, size, maxsize;
+	struct mtd_info *mtd;
+
+	dev = boot_cfg->dev;
+	mtd = boot_cfg->mtd;
+	size = 0;
+
+	if (mtd_arg_off_size(argc - num, argv + num, &dev, &offset, &size,
+			     &maxsize, MTD_DEV_TYPE_NAND, mtd->size))
+		return CMD_RET_FAILURE;
+
+	boot_cfg->maxsize = maxsize;
+	boot_cfg->offset = offset;
+
+	debug("max: %llx, offset: %llx\n", maxsize, offset);
+
+	if (size && size != maxsize)
+		boot_cfg->input_size = size;
+
+	return CMD_RET_SUCCESS;
+}
+
+static int nandbcb_set_boot_config(int argc, char * const argv[],
+				   struct boot_config *boot_cfg)
+{
+	struct mtd_info *mtd;
+	loff_t maxsize;
+	loff_t boot_stream1_address, boot_stream2_address, max_boot_stream_size;
+
+	if (!boot_cfg->mtd) {
+		printf("Didn't get the mtd info, quit\n");
+		return CMD_RET_FAILURE;
+	}
+	mtd = boot_cfg->mtd;
+
+	/*
+	 * By default
+	 * set the search count as 4
+	 * set each FCB/DBBT/Firmware offset at the beginning of blocks
+	 * customers may change the value as needed
+	 */
+
+	/* if need more compact layout, change these values */
+	/* g_boot_search_count was set as 4 at the definition*/
+	/* g_pages_per_stride was set as block size */
+
+	g_pages_per_stride = mtd->erasesize / mtd->writesize;
+
+	g_boot_search_stride = mtd->writesize * g_pages_per_stride;
+
+	boot_cfg->stride_size_in_byte = g_boot_search_stride * mtd->writesize;
+	boot_cfg->search_area_size_in_bytes =
+		g_boot_search_count * g_boot_search_stride;
+	boot_cfg->search_area_size_in_pages =
+		boot_cfg->search_area_size_in_bytes / mtd->writesize;
+
+	/* after FCB/DBBT, split the rest of area for two Firmwares */
+	if (!boot_cfg->maxsize) {
+		printf("Didn't get the maxsize, quit\n");
+		return CMD_RET_FAILURE;
+	}
+	maxsize = boot_cfg->maxsize;
+	/* align to page boundary */
+	maxsize = ((u32)(maxsize + mtd->writesize - 1)) / (u32)mtd->writesize
+			* mtd->writesize;
+
+	boot_stream1_address = 2 * boot_cfg->search_area_size_in_bytes;
+	boot_stream2_address = ((maxsize - boot_stream1_address) / 2 +
+			       boot_stream1_address);
+
+	if (boot_cfg->secondary_boot_stream_off_in_MB)
+		boot_stream2_address = boot_cfg->secondary_boot_stream_off_in_MB * 1024 * 1024;
+
+	max_boot_stream_size = boot_stream2_address - boot_stream1_address;
+
+	/* sanity check */
+	if (max_boot_stream_size <= 0) {
+		debug("st1_addr: %llx, st2_addr: %llx, max: %llx\n",
+		      boot_stream1_address, boot_stream2_address,
+		      max_boot_stream_size);
+		printf("something wrong with firmware address settings\n");
+		return CMD_RET_FAILURE;
+	}
+	boot_cfg->boot_stream1_address = boot_stream1_address;
+	boot_cfg->boot_stream2_address = boot_stream2_address;
+	boot_cfg->max_boot_stream_size = max_boot_stream_size;
+
+	/* set the boot_stream size as the input size now */
+	if (boot_cfg->input_size) {
+		boot_cfg->boot_stream1_size = boot_cfg->input_size;
+		boot_cfg->boot_stream2_size = boot_cfg->input_size;
+	}
+
+	return CMD_RET_SUCCESS;
+}
+
+static int nandbcb_check_space(struct boot_config *boot_cfg)
+{
+	size_t maxsize = boot_cfg->maxsize;
+	size_t max_boot_stream_size = boot_cfg->max_boot_stream_size;
+	loff_t boot_stream2_address = boot_cfg->boot_stream2_address;
+
+	if (boot_cfg->boot_stream1_size &&
+	    boot_cfg->boot_stream1_size > max_boot_stream_size) {
+		printf("boot stream1 doesn't fit, check partition size or settings\n");
+		return CMD_RET_FAILURE;
+	}
+
+	if (boot_cfg->boot_stream2_size &&
+	    boot_cfg->boot_stream2_size > maxsize - boot_stream2_address) {
+		printf("boot stream2 doesn't fit, check partition size or settings\n");
+		return CMD_RET_FAILURE;
+	}
+
+	return CMD_RET_SUCCESS;
+}
 
 #if defined(CONFIG_MX6UL) || defined(CONFIG_MX6ULL)
 static uint8_t reverse_bit(uint8_t b)
@@ -145,9 +418,9 @@ static u32 calc_chksum(void *buf, size_t size)
 	return ~chksum;
 }
 
-static void fill_fcb(struct fcb_block *fcb, struct mtd_info *mtd,
-		     u32 fw1_start, u32 fw2_start, u32 fw_pages)
+static void fill_fcb(struct fcb_block *fcb, struct boot_config *boot_cfg)
 {
+	struct mtd_info *mtd = boot_cfg->mtd;
 	struct nand_chip *chip = mtd_to_nand(mtd);
 	struct mxs_nand_info *nand_info = nand_get_controller_data(chip);
 	struct mxs_nand_layout l;
@@ -157,6 +430,11 @@ static void fill_fcb(struct fcb_block *fcb, struct mtd_info *mtd,
 	fcb->fingerprint = FCB_FINGERPRINT;
 	fcb->version = FCB_VERSION_1;
 
+	fcb->datasetup = 80;
+	fcb->datahold = 60;
+	fcb->addr_setup = 25;
+	fcb->dsample_time = 6;
+
 	fcb->pagesize = mtd->writesize;
 	fcb->oob_pagesize = mtd->writesize + mtd->oobsize;
 	fcb->sectors = mtd->erasesize / mtd->writesize;
@@ -169,41 +447,25 @@ static void fill_fcb(struct fcb_block *fcb, struct mtd_info *mtd,
 	fcb->ecc_type = l.eccn;
 	fcb->bchtype = l.gf_len;
 
-	/* Also hardcoded in kobs-ng */
-	if (is_mx6() || is_imx8m()) {
-		fcb->datasetup = 80;
-		fcb->datahold = 60;
-		fcb->addr_setup = 25;
-		fcb->dsample_time = 6;
-	} else if (is_mx7()) {
-		fcb->datasetup = 10;
-		fcb->datahold = 7;
-		fcb->addr_setup = 15;
-		fcb->dsample_time = 6;
-	}
-
-	/* DBBT search area starts at second page on first block */
-	fcb->dbbt_start = 1;
+	/* DBBT search area starts from the next block after all FCB */
+	fcb->dbbt_start = boot_cfg->search_area_size_in_pages;
 
 	fcb->bb_byte = nand_info->bch_geometry.block_mark_byte_offset;
 	fcb->bb_start_bit = nand_info->bch_geometry.block_mark_bit_offset;
 
 	fcb->phy_offset = mtd->writesize;
 
-	fcb->nr_blocks = mtd->writesize / fcb->ecc_nr - 1;
-
 	fcb->disbbm = 0;
-	fcb->disbbm_search = 0;
 
-	fcb->fw1_start = fw1_start; /* Firmware image starts on this sector */
-	fcb->fw2_start = fw2_start; /* Secondary FW Image starting Sector */
-	fcb->fw1_pages = fw_pages; /* Number of sectors in firmware image */
-	fcb->fw2_pages = fw_pages; /* Number of sector in secondary FW image */
+	fcb->fw1_start = CONV_TO_PAGES(boot_cfg->boot_stream1_address);
+	fcb->fw2_start = CONV_TO_PAGES(boot_cfg->boot_stream2_address);
+	fcb->fw1_pages = CONV_TO_PAGES(boot_cfg->boot_stream1_size);
+	fcb->fw2_pages = CONV_TO_PAGES(boot_cfg->boot_stream2_size);
 
 	fcb->checksum = calc_chksum((void *)fcb + 4, sizeof(*fcb) - 4);
 }
 
-static int dbbt_fill_data(struct mtd_info *mtd, void *buf, int num_blocks)
+static int fill_dbbt_data(struct mtd_info *mtd, void *buf, int num_blocks)
 {
 	int n, n_bad_blocks = 0;
 	u32 *bb = buf + 0x8;
@@ -223,21 +485,92 @@ static int dbbt_fill_data(struct mtd_info *mtd, void *buf, int num_blocks)
 	return n_bad_blocks;
 }
 
-static int write_fcb_dbbt_and_readback(struct mtd_info *mtd,
-				       struct fcb_block *fcb,
-				       struct dbbt_block *dbbt,
-				       void *dbbt_data_page, loff_t off)
+/*
+ * return 1	- bad block
+ * return 0	- read successfully
+ * return < 0	- read failed
+ */
+static int read_fcb(struct boot_config *boot_cfg, struct fcb_block *fcb,
+		    loff_t off)
 {
-	void *fcb_raw_page = 0;
+	struct mtd_info *mtd;
+	void *fcb_raw_page;
+	size_t size;
+	int ret = 0;
+
+	mtd = boot_cfg->mtd;
+	fcb_raw_page = kzalloc(mtd->writesize + mtd->oobsize, GFP_KERNEL);
+
+	if (mtd_block_isbad(mtd, off)) {
+		printf("Block %d is bad, skipped\n", (int)CONV_TO_BLOCKS(off));
+		return 1;
+	}
+
+	/*
+	 * User BCH hardware to decode ECC for FCB
+	 */
+	if (plat_config.misc_flags & FCB_ENCODE_BCH) {
+		size = sizeof(struct fcb_block);
+
+		/* switch nand BCH to FCB compatible settings */
+		if (plat_config.misc_flags & FCB_ENCODE_BCH_62b)
+			mxs_nand_mode_fcb_62bit(mtd);
+		else if (plat_config.misc_flags & FCB_ENCODE_BCH_40b)
+			mxs_nand_mode_fcb_40bit(mtd);
+
+		ret = nand_read(mtd, off, &size, (u_char *)fcb);
+
+		/* switch BCH back */
+		mxs_nand_mode_normal(mtd);
+		printf("NAND FCB read from 0x%llx offset 0x%zx read: %s\n",
+		       off, size, ret ? "ERROR" : "OK");
+
+	} else if (plat_config.misc_flags & FCB_ENCODE_HAMMING) {
+		/* raw read*/
+		mtd_oob_ops_t ops = {
+			.datbuf = (u8 *)fcb_raw_page,
+			.oobbuf = ((u8 *)fcb_raw_page) + mtd->writesize,
+			.len = mtd->writesize,
+			.ooblen = mtd->oobsize,
+			.mode = MTD_OPS_RAW
+			};
+
+		ret = mtd_read_oob(mtd, off, &ops);
+		printf("NAND FCB read from 0x%llx offset 0x%zx read: %s\n",
+		       off, ops.len, ret ? "ERROR" : "OK");
+	}
+
+	if (ret)
+		goto fcb_raw_page_err;
+
+	if ((plat_config.misc_flags & FCB_ENCODE_HAMMING) &&
+	    (plat_config.misc_flags & FCB_LAYOUT_RESV_12B))
+		memcpy(fcb, fcb_raw_page + 12, sizeof(struct fcb_block));
+
+/* TODO: check if it can pass Hamming check */
+
+fcb_raw_page_err:
+	kfree(fcb_raw_page);
+
+	return ret;
+}
+
+static int write_fcb(struct boot_config *boot_cfg, struct fcb_block *fcb)
+{
+	struct mtd_info *mtd;
+	void *fcb_raw_page = NULL;
 	int i, ret;
-	size_t dummy;
+	loff_t off;
+	size_t size;
+
+	mtd = boot_cfg->mtd;
 
 	/*
 	 * We prepare raw page only for i.MX6, for i.MX7 we
 	 * leverage BCH hw module instead
 	 */
-	if (is_mx6()) {
-		/* write fcb/dbbt */
+	if ((plat_config.misc_flags & FCB_ENCODE_HAMMING) &&
+	    (plat_config.misc_flags & FCB_LAYOUT_RESV_12B)) {
 		fcb_raw_page = kzalloc(mtd->writesize + mtd->oobsize,
 				       GFP_KERNEL);
 		if (!fcb_raw_page) {
@@ -265,34 +598,36 @@ static int write_fcb_dbbt_and_readback(struct mtd_info *mtd,
 		 */
 		memset(fcb_raw_page + mtd->writesize, 0xFF, 2);
 	}
-	for (i = 0; i < 2; i++) {
+
+	/* start writing FCB from the very beginning */
+	off = 0;
+
+	for (i = 0; i < g_boot_search_count; i++) {
 		if (mtd_block_isbad(mtd, off)) {
 			printf("Block %d is bad, skipped\n", i);
 			continue;
 		}
 
 		/*
-		 * User BCH ECC hardware module for i.MX7
+		 * User BCH hardware module to generate ECC for FCB
 		 */
-		if (is_mx7() || is_imx8m()) {
-			u32 off = i * mtd->erasesize;
-			size_t rwsize = sizeof(*fcb);
-
-			printf("Writing %zd bytes to 0x%x: ", rwsize, off);
+		if (plat_config.misc_flags & FCB_ENCODE_BCH) {
+			size = sizeof(struct fcb_block);
 
 			/* switch nand BCH to FCB compatible settings */
-			mxs_nand_mode_fcb(mtd);
-			ret = nand_write(mtd, off, &rwsize,
-					 (unsigned char *)fcb);
+			if (plat_config.misc_flags & FCB_ENCODE_BCH_62b)
+				mxs_nand_mode_fcb_62bit(mtd);
+			else if (plat_config.misc_flags & FCB_ENCODE_BCH_40b)
+				mxs_nand_mode_fcb_40bit(mtd);
 
-			dump_fcb_off[i] = off;
-			nand_read(mtd, off, &rwsize,
-				  (unsigned char *)(dump_nand_fcb + i));
+			ret = nand_write(mtd, off, &size, (u_char *)fcb);
 
+			/* switch BCH back */
 			mxs_nand_mode_normal(mtd);
+			printf("NAND FCB write to 0x%zx offset 0x%llx written: %s\n",
+			       size, off, ret ? "ERROR" : "OK");
 
-			printf("%s\n", ret ? "ERROR" : "OK");
-		} else if (is_mx6()) {
+		} else if (plat_config.misc_flags & FCB_ENCODE_HAMMING) {
 			/* raw write */
 			mtd_oob_ops_t ops = {
 				.datbuf = (u8 *)fcb_raw_page,
@@ -303,65 +638,327 @@ static int write_fcb_dbbt_and_readback(struct mtd_info *mtd,
 				.mode = MTD_OPS_RAW
 			};
 
-			ret = mtd_write_oob(mtd, mtd->erasesize * i, &ops);
-			if (ret)
-				goto fcb_raw_page_err;
-			debug("NAND fcb write: 0x%x offset 0x%zx written: %s\n",
-			      mtd->erasesize * i, ops.len, ret ?
-			      "ERROR" : "OK");
-
-			ops.datbuf = (u8 *)(dump_nand_fcb + i);
-			ops.oobbuf = ((u8 *)(dump_nand_fcb + i)) + mtd->writesize;
-			mtd_read_oob(mtd, mtd->erasesize * i, &ops);
+			ret = mtd_write_oob(mtd, off, &ops);
+			printf("NAND FCB write to 0x%llxx offset 0x%zx written: %s\n", off, ops.len, ret ? "ERROR" : "OK");
 		}
 
-		ret = mtd_write(mtd, mtd->erasesize * i + mtd->writesize,
-				mtd->writesize, &dummy, (void *)dbbt);
 		if (ret)
 			goto fcb_raw_page_err;
-		debug("NAND dbbt write: 0x%x offset, 0x%zx bytes written: %s\n",
-		      mtd->erasesize * i + mtd->writesize, dummy,
-		      ret ? "ERROR" : "OK");
 
-		dump_dbbt_off[i] = mtd->erasesize * i + mtd->writesize;
-		size_t rwsize = sizeof(*dbbt);
+		/* next writing location */
+		off += g_boot_search_stride;
+	}
+
+	return 0;
+
+fcb_raw_page_err:
+	kfree(fcb_raw_page);
+
+	return ret;
+}
+
+/*
+ * return 1	- bad block
+ * return 0	- read successfully
+ * return < 0	- read failed
+ */
+static int read_dbbt(struct boot_config *boot_cfg, struct dbbt_block *dbbt,
+		      void *dbbt_data_page, loff_t off)
+{
+	size_t size;
+	struct mtd_info *mtd;
+	loff_t to;
+	int ret;
+
+	mtd = boot_cfg->mtd;
+
+	if (mtd_block_isbad(mtd, off)) {
+		printf("Block %d is bad, skipped\n",
+		       (int)CONV_TO_BLOCKS(off));
+		return 1;
+	}
+
+	size = sizeof(struct dbbt_block);
+	ret = nand_read(mtd, off, &size, (u_char *)dbbt);
+	printf("NAND DBBT read from 0x%llx offset 0x%zx read: %s\n",
+	       off, size, ret ? "ERROR" : "OK");
+	if (ret)
+		return ret;
+
+	/* dbbtpages == 0 if no bad blocks */
+	if (dbbt->dbbtpages > 0) {
+		to = off + 4 * mtd->writesize;
+		size = mtd->writesize;
+		ret = nand_read(mtd, to, &size, dbbt_data_page);
+		printf("DBBT data read from 0x%llx offset 0x%zx read: %s\n",
+		       to, size, ret ? "ERROR" : "OK");
+
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int write_dbbt(struct boot_config *boot_cfg, struct dbbt_block *dbbt,
+		      void *dbbt_data_page)
+{
+	int i;
+	loff_t off, to;
+	size_t size;
+	struct mtd_info *mtd;
+	int ret;
+
+	mtd = boot_cfg->mtd;
+
+	/* start writing DBBT after all FCBs */
+	off = boot_cfg->search_area_size_in_bytes;
+	size = mtd->writesize;
 
-		nand_read(mtd, dump_dbbt_off[i], &rwsize,
-			  (unsigned char *)(dump_nand_dbbt + i));
+	for (i = 0; i < g_boot_search_count; i++) {
+		if (mtd_block_isbad(mtd, off)) {
+			printf("Block %d is bad, skipped\n",
+			       (int)(i + CONV_TO_BLOCKS(off)));
+			continue;
+		}
+
+		ret = nand_write(mtd, off, &size, (u_char *)dbbt);
+		printf("NAND DBBT write to 0x%llx offset 0x%zx written: %s\n",
+		       off, size, ret ? "ERROR" : "OK");
+		if (ret)
+			return ret;
 
 		/* dbbtpages == 0 if no bad blocks */
 		if (dbbt->dbbtpages > 0) {
-			loff_t to = (mtd->erasesize * i + mtd->writesize * 5);
+			to = off + 4 * mtd->writesize;
+			ret = nand_write(mtd, to, &size, dbbt_data_page);
+			printf("DBBT data write to 0x%llx offset 0x%zx written: %s\n",
+			       to, size, ret ? "ERROR" : "OK");
 
-			ret = mtd_write(mtd, to, mtd->writesize, &dummy,
-					dbbt_data_page);
-			if (ret)
-				goto fcb_raw_page_err;
+		if (ret)
+			return ret;
 		}
+
+		/* next writing location */
+		off += g_boot_search_stride;
 	}
 
-fcb_raw_page_err:
-	if (is_mx6())
-		kfree(fcb_raw_page);
+	return 0;
+}
+
+/* reuse the check_skip_len from nand_util.c with minor change*/
+static int check_skip_length(struct boot_config *boot_cfg, loff_t offset,
+			     size_t length, size_t *used)
+{
+	struct mtd_info *mtd = boot_cfg->mtd;
+	size_t maxsize = boot_cfg->maxsize;
+	size_t len_excl_bad = 0;
+	int ret = 0;
+
+	while (len_excl_bad < length) {
+		size_t block_len, block_off;
+		loff_t block_start;
+
+		if (offset >= maxsize)
+			return -1;
+
+		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))
+			len_excl_bad += block_len;
+		else
+			ret = 1;
+
+		offset += block_len;
+		*used += block_len;
+	}
+
+	/* If the length is not a multiple of block_len, adjust. */
+	if (len_excl_bad > length)
+		*used -= (len_excl_bad - length);
 
 	return ret;
 }
 
-static int nandbcb_update(struct mtd_info *mtd, loff_t off, size_t size,
-			  size_t maxsize, const u_char *buf)
+static int nandbcb_get_next_good_blk_addr(struct boot_config *boot_cfg,
+					  struct boot_stream_config *bs_cfg)
 {
+	struct mtd_info *mtd = boot_cfg->mtd;
+	loff_t offset = bs_cfg->bs_addr;
+	size_t length = bs_cfg->bs_size;
+	size_t used = 0;
+	int ret;
+
+	ret = check_skip_length(boot_cfg, offset, length, &used);
+
+	if (ret < 0)
+		return ret;
+
+	/* get next image address */
+	bs_cfg->next_bs_addr = (u32)(offset + used + mtd->erasesize - 1)
+				 / (u32)mtd->erasesize * mtd->erasesize;
+
+	return ret;
+}
+
+static int nandbcb_write_bs_skip_bad(struct boot_config *boot_cfg,
+				     struct boot_stream_config *bs_cfg)
+{
+	struct mtd_info *mtd;
+	void *buf;
+	loff_t offset, maxsize;
+	size_t size;
+	size_t length;
+	int ret;
+	bool padding_flag = false;
+
+	mtd = boot_cfg->mtd;
+	offset = bs_cfg->bs_addr;
+	maxsize = boot_cfg->maxsize;
+	size = bs_cfg->bs_size;
+
+	/* some boot images may need leading offset */
+	if (bs_cfg->need_padding &&
+	    (plat_config.misc_flags & FIRMWARE_NEED_PADDING))
+		padding_flag = 1;
+
+	if (padding_flag)
+		length = ALIGN(size + FLASH_OFFSET_STANDARD, mtd->writesize);
+	else
+		length = ALIGN(size, mtd->writesize);
+
+	buf = kzalloc(length, GFP_KERNEL);
+	if (!buf) {
+		printf("failed to allocate buffer for firmware\n");
+		ret = -ENOMEM;
+		return ret;
+	}
+
+	if (padding_flag)
+		memcpy(buf + FLASH_OFFSET_STANDARD, bs_cfg->bs_buf, size);
+	else
+		memcpy(buf, bs_cfg->bs_buf, size);
+
+	ret = nand_write_skip_bad(mtd, offset, &length, NULL, maxsize,
+				  (u_char *)buf, WITH_WR_VERIFY);
+	printf("Write %s @0x%llx offset, 0x%zx bytes written: %s\n",
+	       bs_cfg->bs_label, offset, length, ret ? "ERROR" : "OK");
+
+	if (ret)
+		/* write image failed, quit */
+		goto err;
+
+	/* get next good blk address if needed */
+	if (bs_cfg->need_padding) {
+		ret = nandbcb_get_next_good_blk_addr(boot_cfg, bs_cfg);
+		if (ret < 0) {
+			printf("Next image cannot fit in NAND partition\n");
+			goto err;
+		}
+	}
+
+	/* now we know how the exact image size written to NAND */
+	bs_cfg->bs_size = length;
+	return 0;
+err:
+	kfree(buf);
+	return ret;
+}
+
+static int nandbcb_write_fw(struct boot_config *boot_cfg, u_char *buf,
+			    int index)
+{
+	int i;
+	loff_t offset;
+	size_t size;
+	loff_t next_bs_addr;
+	struct boot_stream_config bs_cfg;
+	int ret;
+
+	for (i = 0; i < 2; ++i) {
+		if (!(FW_INX(i) & index))
+			continue;
+
+		if (i == 0) {
+			offset = boot_cfg->boot_stream1_address;
+			size = boot_cfg->boot_stream1_size;
+		} else {
+			offset = boot_cfg->boot_stream2_address;
+			size = boot_cfg->boot_stream2_size;
+		}
+
+		/* write Firmware*/
+		if (!(plat_config.misc_flags & FIRMWARE_EXTRA_ONE)) {
+			memset(&bs_cfg, 0, sizeof(struct boot_stream_config));
+			sprintf(bs_cfg.bs_label, "firmware%d", i);
+			bs_cfg.bs_addr = offset;
+			bs_cfg.bs_size = size;
+			bs_cfg.bs_buf = buf;
+			bs_cfg.need_padding = 1;
+
+			ret = nandbcb_write_bs_skip_bad(boot_cfg, &bs_cfg);
+			if (ret)
+				return ret;
+
+			/* update the boot stream size */
+			if (i == 0)
+				boot_cfg->boot_stream1_size = bs_cfg.bs_size;
+			else
+				boot_cfg->boot_stream2_size = bs_cfg.bs_size;
+
+		} else {
+		/* some platforms need extra firmware */
+			memset(&bs_cfg, 0, sizeof(struct boot_stream_config));
+			sprintf(bs_cfg.bs_label, "fw%d_part%d", i, 1);
+			bs_cfg.bs_addr = offset;
+			bs_cfg.bs_size = IMX8MQ_HDMI_FW_SZ;
+			bs_cfg.bs_buf = buf;
+			bs_cfg.need_padding = 1;
+
+			ret = nandbcb_write_bs_skip_bad(boot_cfg, &bs_cfg);
+			if (ret)
+				return ret;
+
+			/* update the boot stream size */
+			if (i == 0)
+				boot_cfg->boot_stream1_size = bs_cfg.bs_size;
+			else
+				boot_cfg->boot_stream2_size = bs_cfg.bs_size;
+
+			/* get next image address */
+			next_bs_addr = bs_cfg.next_bs_addr;
+
+			memset(&bs_cfg, 0, sizeof(struct boot_stream_config));
+			sprintf(bs_cfg.bs_label, "fw%d_part%d", i, 2);
+			bs_cfg.bs_addr = next_bs_addr;
+			bs_cfg.bs_size = IMX8MQ_SPL_SZ;
+			bs_cfg.bs_buf = (u_char *)(buf + IMX8MQ_HDMI_FW_SZ);
+			bs_cfg.need_padding = 0;
+
+			ret = nandbcb_write_bs_skip_bad(boot_cfg, &bs_cfg);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int nandbcb_init(struct boot_config *boot_cfg, u_char *buf)
+{
+	struct mtd_info *mtd;
 	nand_erase_options_t opts;
 	struct fcb_block *fcb;
 	struct dbbt_block *dbbt;
-	loff_t fw1_off;
-	void *fwbuf, *dbbt_page, *dbbt_data_page;
-	u32 fw1_start, fw1_pages;
-	int nr_blks, nr_blks_fcb, fw1_blk;
-	size_t fwsize;
+	void *dbbt_page, *dbbt_data_page;
 	int ret;
-	size_t extra_fwsize;
-	void *extra_fwbuf;
-	loff_t extra_fw1_off;
+	loff_t maxsize, off;
+
+	mtd = boot_cfg->mtd;
+	maxsize = boot_cfg->maxsize;
+	off = boot_cfg->offset;
 
 	/* erase */
 	memset(&opts, 0, sizeof(opts));
@@ -391,85 +988,24 @@ static int nandbcb_update(struct mtd_info *mtd, loff_t off, size_t size,
 	 * - two firmware blocks, primary and secondary
 	 * - first 4 block for FCB/DBBT
 	 * - rest split in half for primary and secondary firmware
-	 * - same firmware will write two times
+	 * - same firmware write twice
 	 */
-	nr_blks_fcb = BOOT_SEARCH_COUNT;
-	nr_blks = maxsize / mtd->erasesize;
-	fw1_blk = nr_blks_fcb;
-
-	/* write fw */
-	fwbuf = NULL;
-	if (is_mx6() || is_mx7()) {
-		fwsize = ALIGN(size + FLASH_OFFSET_STANDARD + mtd->writesize,
-			       mtd->writesize);
-		fwbuf = kzalloc(fwsize, GFP_KERNEL);
-		if (!fwbuf) {
-			debug("failed to allocate fwbuf\n");
-			ret = -ENOMEM;
-			goto err;
-		}
-
-		memcpy(fwbuf + FLASH_OFFSET_STANDARD, buf, size);
-		fw1_off = fw1_blk * mtd->erasesize;
-		ret = nand_write_skip_bad(mtd, fw1_off, &fwsize, NULL, maxsize,
-					  (u_char *)fwbuf, WITH_WR_VERIFY);
-		printf("NAND fw write: 0x%llx offset, 0x%zx bytes written: %s\n",
-		       fw1_off, fwsize, ret ? "ERROR" : "OK");
-		if (ret)
-			goto fwbuf_err;
-	} else if (is_imx8m()) {
-		fwsize = ALIGN(IMX8MQ_SPL_SZ + FLASH_OFFSET_STANDARD + mtd->writesize, mtd->writesize);
-		fwbuf = kzalloc(fwsize, GFP_KERNEL);
-		if (!fwbuf) {
-			printf("failed to allocate fwbuf\n");
-			ret = -ENOMEM;
-			goto err;
-		}
 
-		memcpy(fwbuf + FLASH_OFFSET_STANDARD, buf, IMX8MQ_SPL_SZ);
-		fw1_off = fw1_blk * mtd->erasesize;
-		ret = nand_write_skip_bad(mtd, fw1_off, &fwsize, NULL, maxsize,
-					  (u_char *)fwbuf, WITH_WR_VERIFY);
-		printf("NAND fw write: 0x%llx offset, 0x%zx bytes written: %s\n",
-		       fw1_off, fwsize, ret ? "ERROR" : "OK");
-		if (ret)
-			goto fwbuf_err;
-
-		extra_fwsize = ALIGN(IMX8MQ_SPL_SZ + mtd->writesize, mtd->writesize);
-		extra_fwbuf = kzalloc(extra_fwsize, GFP_KERNEL);
-		extra_fw1_off = fw1_off + mtd->erasesize * ((IMX8MQ_SPL_SZ + mtd->erasesize - 1) / mtd->erasesize);
-		if (!extra_fwbuf) {
-			printf("failed to allocate fwbuf\n");
-			ret = -ENOMEM;
-			goto fwbuf_err;
-		}
-
-		memcpy(extra_fwbuf, buf + IMX8MQ_HDMI_FW_SZ, IMX8MQ_SPL_SZ);
-		ret = nand_write_skip_bad(mtd, extra_fw1_off, &extra_fwsize, NULL, maxsize,
-					  (u_char *)extra_fwbuf, WITH_WR_VERIFY);
-		printf("NAND extra_fw write: 0x%llx offset, 0x%zx bytes written: %s\n",
-		       extra_fw1_off, extra_fwsize, ret ? "ERROR" : "OK");
-		if (ret) {
-			kfree(extra_fwbuf);
-			goto fwbuf_err;
-		}
-	}
+	/* write Firmware*/
+	ret = nandbcb_write_fw(boot_cfg, buf, FW_ALL);
+	if (ret)
+		goto err;
 
 	/* fill fcb */
 	fcb = kzalloc(sizeof(*fcb), GFP_KERNEL);
 	if (!fcb) {
 		debug("failed to allocate fcb\n");
 		ret = -ENOMEM;
-		goto fwbuf_err;
+		return ret;
 	}
+	fill_fcb(fcb, boot_cfg);
 
-	fw1_start = (fw1_blk * mtd->erasesize) / mtd->writesize;
-	fw1_pages = size / mtd->writesize + 1;
-	if (is_imx8m())
-		fw1_pages = (IMX8MQ_SPL_SZ + (mtd->writesize - 1)) / mtd->writesize;
-	fill_fcb(fcb, mtd, fw1_start, 0, fw1_pages);
-
-	dump_fill_fcb = *fcb;
+	ret = write_fcb(boot_cfg, fcb);
 
 	/* fill dbbt */
 	dbbt_page = kzalloc(mtd->writesize, GFP_KERNEL);
@@ -488,18 +1024,16 @@ static int nandbcb_update(struct mtd_info *mtd, loff_t off, size_t size,
 
 	dbbt = dbbt_page;
 	dbbt->checksum = 0;
-	dbbt->fingerprint = DBBT_FINGERPRINT2;
+	dbbt->fingerprint = DBBT_FINGERPRINT;
 	dbbt->version = DBBT_VERSION_1;
-	ret = dbbt_fill_data(mtd, dbbt_data_page, nr_blks);
+	ret = fill_dbbt_data(mtd, dbbt_data_page, CONV_TO_BLOCKS(maxsize));
 	if (ret < 0)
 		goto dbbt_data_page_err;
 	else if (ret > 0)
 		dbbt->dbbtpages = 1;
 
-	dump_fill_dbbt = *dbbt;
-
-	/* write fcb and dbbt to nand */
-	ret = write_fcb_dbbt_and_readback(mtd, fcb, dbbt, dbbt_data_page, off);
+	/* write dbbt */
+	ret = write_dbbt(boot_cfg, dbbt, dbbt_data_page);
 	if (ret < 0)
 		printf("failed to write FCB/DBBT\n");
 
@@ -509,8 +1043,6 @@ dbbt_page_err:
 	kfree(dbbt_page);
 fcb_err:
 	kfree(fcb);
-fwbuf_err:
-	kfree(fwbuf);
 err:
 	return ret;
 }
@@ -519,69 +1051,98 @@ static int do_nandbcb_bcbonly(int argc, char * const argv[])
 {
 	struct fcb_block *fcb;
 	struct dbbt_block *dbbt;
-	u32 fw_len, fw1_off, fw2_off;
 	struct mtd_info *mtd;
+	nand_erase_options_t opts;
+	size_t maxsize;
+	loff_t off;
 	void *dbbt_page, *dbbt_data_page;
-	int dev, ret;
+	int ret;
+	struct boot_config cfg;
 
-	dev = nand_curr_device;
-	if ((dev < 0) || (dev >= CONFIG_SYS_MAX_NAND_DEVICE) ||
-	    (!get_nand_dev_by_index(dev))) {
-		puts("No devices available\n");
+	if (argc < 4)
+		return CMD_RET_USAGE;
+
+	memset(&cfg, 0, sizeof(struct boot_config));
+	if (nandbcb_get_info(argc, argv, &cfg))
 		return CMD_RET_FAILURE;
-	}
 
-	mtd = get_nand_dev_by_index(dev);
+	/* only get the partition info */
+	if (nandbcb_get_size(2, argv, 1, &cfg))
+		return CMD_RET_FAILURE;
 
-	if (argc < 3)
+	if (nandbcb_set_boot_config(argc, argv, &cfg))
 		return CMD_RET_FAILURE;
 
-	fw_len = simple_strtoul(argv[1], NULL, 16);
-	fw1_off = simple_strtoul(argv[2], NULL, 16);
+	mtd = cfg.mtd;
 
-	if (argc > 3)
-		fw2_off = simple_strtoul(argv[3], NULL, 16);
-	else
-		fw2_off = fw1_off;
+	cfg.boot_stream1_address = simple_strtoul(argv[2], NULL, 16);
+	cfg.boot_stream1_size = simple_strtoul(argv[3], NULL, 16);
+	cfg.boot_stream1_size = ALIGN(cfg.boot_stream1_size, mtd->writesize);
+
+	if (argc > 5) {
+		cfg.boot_stream2_address = simple_strtoul(argv[4], NULL, 16);
+		cfg.boot_stream2_size = simple_strtoul(argv[5], NULL, 16);
+		cfg.boot_stream2_size = ALIGN(cfg.boot_stream2_size,
+					      mtd->writesize);
+	}
+
+	/* sanity check */
+	nandbcb_check_space(&cfg);
+
+	maxsize = cfg.maxsize;
+	off = cfg.offset;
+
+	/* erase the previous FCB/DBBT */
+	memset(&opts, 0, sizeof(opts));
+	opts.offset = off;
+	opts.length = g_boot_search_stride * 2;
+	ret = nand_erase_opts(mtd, &opts);
+	if (ret) {
+		printf("%s: erase failed (ret = %d)\n", __func__, ret);
+		return CMD_RET_FAILURE;
+	}
 
 	/* fill fcb */
 	fcb = kzalloc(sizeof(*fcb), GFP_KERNEL);
 	if (!fcb) {
-		debug("failed to allocate fcb\n");
+		printf("failed to allocate fcb\n");
 		ret = -ENOMEM;
 		return CMD_RET_FAILURE;
 	}
 
-	fill_fcb(fcb, mtd, fw1_off / mtd->writesize,
-		 fw2_off / mtd->writesize, fw_len / mtd->writesize);
+	fill_fcb(fcb, &cfg);
+
+	/* write fcb */
+	ret = write_fcb(&cfg, fcb);
 
 	/* fill dbbt */
 	dbbt_page = kzalloc(mtd->writesize, GFP_KERNEL);
 	if (!dbbt_page) {
-		debug("failed to allocate dbbt_page\n");
+		printf("failed to allocate dbbt_page\n");
 		ret = -ENOMEM;
 		goto fcb_err;
 	}
 
 	dbbt_data_page = kzalloc(mtd->writesize, GFP_KERNEL);
 	if (!dbbt_data_page) {
-		debug("failed to allocate dbbt_data_page\n");
+		printf("failed to allocate dbbt_data_page\n");
 		ret = -ENOMEM;
 		goto dbbt_page_err;
 	}
 
 	dbbt = dbbt_page;
 	dbbt->checksum = 0;
-	dbbt->fingerprint = DBBT_FINGERPRINT2;
+	dbbt->fingerprint = DBBT_FINGERPRINT;
 	dbbt->version = DBBT_VERSION_1;
-	ret = dbbt_fill_data(mtd, dbbt_data_page, 0);
+	ret = fill_dbbt_data(mtd, dbbt_data_page, CONV_TO_BLOCKS(maxsize));
 	if (ret < 0)
 		goto dbbt_data_page_err;
 	else if (ret > 0)
 		dbbt->dbbtpages = 1;
 
-	/* write fcb and dbbt to nand */
-	ret = write_fcb_dbbt_and_readback(mtd, fcb, dbbt, dbbt_data_page, 0);
+	/* write dbbt */
+	ret = write_dbbt(&cfg, dbbt, dbbt_data_page);
+
 dbbt_data_page_err:
 	kfree(dbbt_data_page);
 dbbt_page_err:
@@ -597,49 +1158,20 @@ fcb_err:
 	return CMD_RET_SUCCESS;
 }
 
-/* dump data which is planned to be encoded and written to NAND chip */
-void mtd_cfg_dump(void)
-{
-	u64 blocks;
-
-	printf("MTD CONFIG:\n");
-	printf("  %s = %d\n", "data_setup_time", dump_fill_fcb.datasetup);
-	printf("  %s = %d\n", "data_hold_time", dump_fill_fcb.datahold);
-	printf("  %s = %d\n", "address_setup_time", dump_fill_fcb.addr_setup);
-	printf("  %s = %d\n", "data_sample_time", dump_fill_fcb.dsample_time);
-
-	printf("NFC geometry :\n");
-	printf("\tECC Strength       : %d\n", dump_mtd->ecc_strength);
-	printf("\tPage Size in Bytes : %d\n", dump_fill_fcb.oob_pagesize);
-	printf("\tMetadata size      : %d\n", dump_fill_fcb.meta_size);
-	printf("\tECC Chunk Size in byte : %d\n", dump_fill_fcb.ecc_size);
-	printf("\tECC Chunk count        : %d\n", dump_fill_fcb.nr_blocks + 1);
-	printf("\tBlock Mark Byte Offset : %d\n", dump_fill_fcb.bb_byte);
-	printf("\tBlock Mark Bit Offset  : %d\n", dump_fill_fcb.bb_start_bit);
-	printf("====================================================\n");
-
-	printf("mtd: partition #0\n");
-	printf("  %s = %d\n", "type", dump_mtd->type);
-	printf("  %s = %d\n", "flags", dump_mtd->flags);
-	printf("  %s = %llu\n", "size", dump_nandboot_size);
-	printf("  %s = %d\n", "erasesize", dump_mtd->erasesize);
-	printf("  %s = %d\n", "writesize", dump_mtd->writesize);
-	printf("  %s = %d\n", "oobsize", dump_mtd->oobsize);
-	blocks = dump_nandboot_size;
-	do_div(blocks, dump_mtd->erasesize);
-	printf("  %s = %llu\n", "blocks", blocks);
-}
-
 /* dump data which is read from NAND chip */
-void mtd_dump_structure(int i)
+void dump_structure(struct boot_config *boot_cfg, struct fcb_block *fcb,
+		    struct dbbt_block *dbbt, void *dbbt_data_page)
 {
-	#define P1(x) printf("  %s = 0x%08x\n", #x, dump_nand_fcb[i].x)
-		printf("FCB %d:\n", i);
+	int i;
+	struct mtd_info *mtd = boot_cfg->mtd;
+
+	#define P1(x) printf("  %s = 0x%08x\n", #x, fcb->x)
+		printf("FCB\n");
 		P1(checksum);
 		P1(fingerprint);
 		P1(version);
 	#undef P1
-	#define P1(x)	printf("  %s = %d\n", #x, dump_nand_fcb[i].x)
+	#define P1(x)	printf("  %s = %d\n", #x, fcb->x)
 		P1(datasetup);
 		P1(datahold);
 		P1(addr_setup);
@@ -684,161 +1216,206 @@ void mtd_dump_structure(int i)
 		P1(busytimeout);
 		P1(disbbm);
 		P1(spare_offset);
+#if !defined(CONFIG_MX6) || defined(CONFIG_MX6SX) || \
+	defined(CONFIG_MX6UL) || defined(CONFIG_MX6ULL)
 		P1(onfi_sync_enable);
 		P1(onfi_sync_speed);
 		P1(onfi_sync_nand_data);
 		P1(disbbm_search);
 		P1(disbbm_search_limit);
 		P1(read_retry_enable);
+#endif
 	#undef P1
-	#define P1(x)	printf("  %s = 0x%08x\n", #x, dump_nand_dbbt[i].x)
-		printf("DBBT %d:\n", i);
+	#define P1(x)	printf("  %s = 0x%08x\n", #x, dbbt->x)
+		printf("DBBT :\n");
 		P1(checksum);
 		P1(fingerprint);
 		P1(version);
 	#undef P1
-	#define P1(x)	printf("  %s = %d\n", #x, dump_nand_dbbt[i].x)
-		P1(numberbb);
+	#define P1(x)	printf("  %s = %d\n", #x, dbbt->x)
+		P1(dbbtpages);
 	#undef P1
 
-	printf("Firmware: image #0 @ 0x%x size 0x%x - available 0x%llx\n",
-	       dump_nand_fcb[i].fw1_start * dump_nand_fcb[i].pagesize,
-	       dump_nand_fcb[i].fw1_pages * dump_nand_fcb[i].pagesize,
-	       dump_nandboot_size - dump_nand_fcb[i].fw1_start *
-	       dump_nand_fcb[i].pagesize);
-	if (is_imx8m()) {
-		printf("Extra Firmware: image #0 @ 0x%x size 0x%x - available 0x%llx\n",
-		       dump_nand_fcb[i].fw1_start *
-		       dump_nand_fcb[i].pagesize + dump_mtd->erasesize *
-		       ((IMX8MQ_SPL_SZ + dump_mtd->erasesize - 1) /
-			dump_mtd->erasesize),
-		       dump_nand_fcb[i].fw1_pages * dump_nand_fcb[i].pagesize,
-		       dump_nandboot_size -
-		       (dump_nand_fcb[i].fw1_start *
-			dump_nand_fcb[i].pagesize + dump_mtd->erasesize *
-			((IMX8MQ_SPL_SZ + dump_mtd->erasesize - 1) /
-			 dump_mtd->erasesize)));
+	for (i = 0; i < dbbt->dbbtpages; ++i)
+		printf("%d ", *((u32 *)(dbbt_data_page + i)));
+
+	if (!(plat_config.misc_flags & FIRMWARE_EXTRA_ONE)) {
+		printf("Firmware: image #0 @ 0x%x size 0x%x\n",
+		       fcb->fw1_start, fcb->fw1_pages * mtd->writesize);
+		printf("Firmware: image #1 @ 0x%x size 0x%x\n",
+		       fcb->fw2_start, fcb->fw2_pages * mtd->writesize);
+	} else {
+		printf("Firmware: image #0 @ 0x%x size 0x%x\n",
+		       fcb->fw1_start, fcb->fw1_pages * mtd->writesize);
+		printf("Firmware: image #1 @ 0x%x size 0x%x\n",
+		       fcb->fw2_start, fcb->fw2_pages * mtd->writesize);
+		/* TODO: Add extra image information */
 	}
 }
 
-static int do_nandbcb_dump(int argc, char * const argv[])
+static bool check_fingerprint(void *data, int fingerprint)
 {
-	int num;
-	int stride;
-	int search_area_sz;
-	bool bab_block_table[BOOT_SEARCH_COUNT];
-	int bab_block_flag;
+	int off = 4;
 
-	if (argc != 2)
-		return CMD_RET_USAGE;
+	return (*(int *)(data + off) == fingerprint);
+}
 
-	switch (argv[1][0]) {
-	case '0':
-		num = 0;
-		break;
-	case '1':
-		num = 1;
-		break;
-	default:
-		return CMD_RET_USAGE;
-	}
+static int nandbcb_dump(struct boot_config *boot_cfg)
+{
+	int i;
+	loff_t off;
+	struct mtd_info *mtd = boot_cfg->mtd;
+	struct fcb_block fcb, fcb_copy;
+	struct dbbt_block dbbt, dbbt_copy;
+	void *dbbt_data_page, *dbbt_data_page_copy;
+	bool fcb_not_found, dbbt_not_found;
+	int ret = 0;
 
-	/* dump data which is planned to be encoded and written to NAND chip */
-	mtd_cfg_dump();
+	dbbt_data_page = kzalloc(mtd->writesize, GFP_KERNEL);
+	if (!dbbt_data_page) {
+		printf("failed to allocate dbbt_data_page\n");
+		ret = -ENOMEM;
+		return ret;
+	}
 
-	stride = dump_mtd->erasesize;
-	search_area_sz = BOOT_SEARCH_COUNT * stride;
-	printf("stride: %x, search_area_sz: %x\n", stride, search_area_sz);
+	dbbt_data_page_copy = kzalloc(mtd->writesize, GFP_KERNEL);
+	if (!dbbt_data_page_copy) {
+		printf("failed to allocate dbbt_data_page\n");
+		ret = -ENOMEM;
+		goto dbbt_page_err;
+	}
 
-	bab_block_flag = 0;
-	for (int i = 0; i < BOOT_SEARCH_COUNT; i++) {
-		if (mtd_block_isbad(dump_mtd,
-				    (loff_t)(dump_mtd->erasesize * i))) {
-			bab_block_table[i] = 1;
-			bab_block_flag = 1;
-			continue;
-		}
-		bab_block_table[i] = 0;
-		if (!memcmp(dump_nand_fcb + i, &dump_fill_fcb,
-			    sizeof(dump_fill_fcb))) {
-			printf("mtd: found FCB%d candidate version %08x @%d:0x%x\n",
-			       i, dump_nand_fcb[i].version, i, dump_fcb_off[i]);
+	/* read fcb */
+	fcb_not_found = 1;
+	off = 0;
+	for (i = 0; i < g_boot_search_count; ++i) {
+		if (fcb_not_found) {
+			ret = read_fcb(boot_cfg, &fcb, off);
+
+			if (ret < 0)
+				goto dbbt_page_copy_err;
+			else if (ret == 1)
+				continue;
+			else if (ret == 0)
+				if (check_fingerprint(&fcb, FCB_FINGERPRINT))
+					fcb_not_found = 0;
 		} else {
-			printf("mtd: FCB%d not found\n", i);
+			ret = read_fcb(boot_cfg, &fcb_copy, off);
+
+			if (ret < 0)
+				goto dbbt_page_copy_err;
+			if (memcmp(&fcb, &fcb_copy,
+				   sizeof(struct fcb_block))) {
+				printf("FCB copies are not identical\n");
+				ret = -EINVAL;
+				goto dbbt_page_copy_err;
+			}
 		}
-	}
-
-	for (int i = 0; i < BOOT_SEARCH_COUNT; i++) {
-		if (mtd_block_isbad(dump_mtd,
-				    (loff_t)(dump_mtd->erasesize * i)))
-			continue;
 
-		if (!memcmp(dump_nand_dbbt + i, &dump_fill_dbbt,
-			    sizeof(dump_fill_dbbt))) {
-			printf("mtd: DBBT%d found\n", i);
-			printf("mtd: Valid DBBT%d found @%d:0x%x\n",
-			       i, i, dump_dbbt_off[i]);
+		/* next read location */
+		off += g_boot_search_stride;
+	}
 
+	/* read dbbt*/
+	dbbt_not_found = 1;
+	off = boot_cfg->search_area_size_in_bytes;
+	for (i = 0; i < g_boot_search_count; ++i) {
+		if (dbbt_not_found) {
+			ret = read_dbbt(boot_cfg, &dbbt, dbbt_data_page, off);
+
+			if (ret < 0)
+				goto dbbt_page_copy_err;
+			else if (ret == 1)
+				continue;
+			else if (ret == 0)
+				if (check_fingerprint(&dbbt, DBBT_FINGERPRINT))
+					dbbt_not_found = 0;
 		} else {
-			printf("mtd: DBBT%d not found\n", i);
-		}
-	}
-	if (bab_block_flag == 0) {
-		printf("no bad block found, dbbt: %08x\n",
-		       dump_fill_dbbt.fingerprint);
-	} else {
-		for (int i = 0; i < BOOT_SEARCH_COUNT; i++) {
-			if (bab_block_table[i] == 1)
-				printf("mtd: bad block @ 0x%llx\n",
-				       (loff_t)(dump_mtd->erasesize * i));
+			ret = read_dbbt(boot_cfg, &dbbt_copy,
+					dbbt_data_page_copy, off);
+
+			if (ret < 0)
+				goto dbbt_page_copy_err;
+			if (memcmp(&dbbt, &dbbt_copy,
+				   sizeof(struct dbbt_block))) {
+				printf("DBBT copies are not identical\n");
+				ret = -EINVAL;
+				goto dbbt_page_copy_err;
+			}
+			if (dbbt.dbbtpages > 0 &&
+			    memcmp(dbbt_data_page, dbbt_data_page_copy,
+				   mtd->writesize)) {
+				printf("DBBT data copies are not identical\n");
+				ret = -EINVAL;
+				goto dbbt_page_copy_err;
+			}
 		}
+
+		/* next read location */
+		off += g_boot_search_stride;
 	}
 
-	/* dump data which is read from NAND chip */
-	if (num > (BOOT_SEARCH_COUNT - 1))
-		return CMD_RET_USAGE;
+	dump_structure(boot_cfg, &fcb, &dbbt, dbbt_data_page);
+
+dbbt_page_copy_err:
+	kfree(dbbt_data_page_copy);
+dbbt_page_err:
+	kfree(dbbt_data_page);
+
+	return ret;
+}
+
+static int do_nandbcb_dump(int argc, char * const argv[])
+{
+	struct boot_config cfg;
+	int ret;
 
-	if (bab_block_table[num] == 1) {
-		printf("mtd: bad block @ 0x%llx (FCB - DBBT)\n",
-		       (loff_t)(dump_mtd->erasesize * num));
+	if (argc != 2)
 		return CMD_RET_USAGE;
-	}
 
-	mtd_dump_structure(num);
+	memset(&cfg, 0, sizeof(struct boot_config));
+	if (nandbcb_get_info(argc, argv, &cfg))
+		return CMD_RET_FAILURE;
+
+	if (nandbcb_get_size(argc, argv, 1, &cfg))
+		return CMD_RET_FAILURE;
 
-	return 0;
+	if (nandbcb_set_boot_config(argc, argv, &cfg))
+		return CMD_RET_FAILURE;
+
+	ret = nandbcb_dump(&cfg);
+	if (ret)
+		return ret;
+
+	return ret;
 }
 
-static int do_nandbcb_update(int argc, char * const argv[])
+static int do_nandbcb_init(int argc, char * const argv[])
 {
-	struct mtd_info *mtd;
-	loff_t addr, offset, size, maxsize;
-	char *endp;
 	u_char *buf;
-	int dev;
+	size_t size;
+	loff_t addr;
+	char *endp;
 	int ret;
+	struct boot_config cfg;
 
 	if (argc != 4)
 		return CMD_RET_USAGE;
 
-	dev = nand_curr_device;
-	if (dev < 0) {
-		printf("failed to get nand_curr_device, run nand device\n");
+	memset(&cfg, 0, sizeof(struct boot_config));
+	if (nandbcb_get_info(argc, argv, &cfg))
 		return CMD_RET_FAILURE;
-	}
 
-	addr = simple_strtoul(argv[1], &endp, 16);
-	if (*argv[1] == 0 || *endp != 0)
+	if (nandbcb_get_size(argc, argv, 2, &cfg))
 		return CMD_RET_FAILURE;
+	size = cfg.boot_stream1_size;
 
-	mtd = get_nand_dev_by_index(dev);
-	if (mtd_arg_off_size(argc - 2, argv + 2, &dev, &offset, &size,
-			     &maxsize, MTD_DEV_TYPE_NAND, mtd->size))
+	if (nandbcb_set_boot_config(argc, argv, &cfg))
 		return CMD_RET_FAILURE;
 
-	/* dump_mtd and dump_nandboot_size are used for "nandbcb dump [-v]" */
-	dump_mtd = mtd;
-	dump_nandboot_size = maxsize;
+	addr = simple_strtoul(argv[1], &endp, 16);
+	if (*argv[1] == 0 || *endp != 0)
+		return CMD_RET_FAILURE;
 
 	buf = map_physmem(addr, size, MAP_WRBACK);
 	if (!buf) {
@@ -846,7 +1423,7 @@ static int do_nandbcb_update(int argc, char * const argv[])
 		return CMD_RET_FAILURE;
 	}
 
-	ret = nandbcb_update(mtd, offset, size, maxsize, buf);
+	ret = nandbcb_init(&cfg, buf);
 
 	return ret == 0 ? CMD_RET_SUCCESS : CMD_RET_FAILURE;
 }
@@ -860,12 +1437,36 @@ static int do_nandbcb(cmd_tbl_t *cmdtp, int flag, int argc,
 	if (argc < 3)
 		goto usage;
 
+	/* check the platform config first */
+	if (is_mx6sx()) {
+		plat_config = imx6sx_plat_config;
+	} else if (is_mx7()) {
+		plat_config = imx7d_plat_config;
+	} else if (is_mx6ul() || is_mx6ull()) {
+		plat_config = imx6ul_plat_config;
+	} else if (is_mx6() && !is_mx6sx() && !is_mx6ul() && !is_mx6ull()) {
+		plat_config = imx6qdl_plat_config;
+	} else if (is_imx8mq()) {
+		plat_config = imx8mq_plat_config;
+	} else if (is_imx8mm()) {
+		plat_config = imx8mm_plat_config;
+	} else if (is_imx8mn()) {
+		plat_config = imx8mn_plat_config;
+	} else if (is_imx8qm() || is_imx8qxp()) {
+		plat_config = imx8q_plat_config;
+	} else {
+		printf("ERROR: Unknown platform\n");
+		return CMD_RET_FAILURE;
+	}
+
+	/* TODO: set the boot search count if need to read from fuse */
+
 	cmd = argv[1];
 	--argc;
 	++argv;
 
-	if (strcmp(cmd, "update") == 0) {
-		ret = do_nandbcb_update(argc, argv);
+	if (strcmp(cmd, "init") == 0) {
+		ret = do_nandbcb_init(argc, argv);
 		goto done;
 	}
 
@@ -888,19 +1489,19 @@ usage:
 
 #ifdef CONFIG_SYS_LONGHELP
 static char nandbcb_help_text[] =
-	"update addr off|partition len	- update 'len' bytes starting at\n"
+	"init addr off|partition len - update 'len' bytes starting at\n"
 	"       'off|part' to memory address 'addr', skipping  bad blocks\n"
-	"bcbonly fw-size fw1-off [fw2-off] - write only BCB (FCB and DBBT)\n"
-	"       where `fw-size` is fw sizes in bytes, `fw1-off`\n"
+	"nandbcb bcbonly off|partition fw1-off fw1-size [fw2-off fw2-size]\n"
+	"	    - write BCB only (FCB and DBBT)\n"
+	"       where `fwx-size` is fw sizes in bytes, `fw1-off`\n"
 	"       and `fw2-off` - firmware offsets\n"
 	"       FIY, BCB isn't erased automatically, so mtd erase should\n"
 	"       be called in advance before writing new BCB:\n"
 	"           > mtd erase mx7-bcb\n"
-	"nandbcb dump num - verify/dump boot structures\n"
-	"	'num' can be set to 0 and 1";
+	"nandbcb dump off|partition - dump/verify boot structures\n";
 #endif
 
-U_BOOT_CMD(nandbcb, 5, 1, do_nandbcb,
-	   "i.MX6/i.MX7 NAND Boot Control Blocks write",
+U_BOOT_CMD(nandbcb, 7, 1, do_nandbcb,
+	   "i.MX NAND Boot Control Blocks write",
 	   nandbcb_help_text
 );