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u-boot/arch/arm/mach-imx/cmd_nandbcb.c
Michael Trimarchi 37a7c374a6 arm: mach-imx: cmd_nandbcb fix bad block handling 
The badblock should be skipped properly in reading and writing.
Fix the logic. The bcb struct is written, skipping the bad block,
so we need to read using the same logic. This was tested create
bad block in the area and then flash it and read it back.

Acked-by: Han Xu <han.xu@nxp.com>
Tested-By: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
2022-05-20 12:36:48 +02:00

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/*
* 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+
*/
#include <common.h>
#include <command.h>
#include <log.h>
#include <malloc.h>
#include <nand.h>
#include <dm/devres.h>
#include <linux/bug.h>
#include <asm/io.h>
#include <jffs2/jffs2.h>
#include <linux/bch.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/rawnand.h>
#include <asm/arch/sys_proto.h>
#include <asm/mach-imx/imx-nandbcb.h>
#include <asm/mach-imx/imximage.cfg>
#include <mxs_nand.h>
#include <linux/mtd/mtd.h>
#include <nand.h>
#include <fuse.h>
#include "../../../cmd/legacy-mtd-utils.h"
/* 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_secondary_offset;
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
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 (g_boot_secondary_offset)
boot_stream2_address =
(loff_t)g_boot_secondary_offset * 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)
{
b = (b & 0xf0) >> 4 | (b & 0x0f) << 4;
b = (b & 0xcc) >> 2 | (b & 0x33) << 2;
b = (b & 0xaa) >> 1 | (b & 0x55) << 1;
return b;
}
static void encode_bch_ecc(void *buf, struct fcb_block *fcb, int eccbits)
{
int i, j, m = 13;
int blocksize = 128;
int numblocks = 8;
int ecc_buf_size = (m * eccbits + 7) / 8;
struct bch_control *bch = init_bch(m, eccbits, 0);
u8 *ecc_buf = kzalloc(ecc_buf_size, GFP_KERNEL);
u8 *tmp_buf = kzalloc(blocksize * numblocks, GFP_KERNEL);
u8 *psrc, *pdst;
/*
* The blocks here are bit aligned. If eccbits is a multiple of 8,
* we just can copy bytes. Otherwiese we must move the blocks to
* the next free bit position.
*/
WARN_ON(eccbits % 8);
memcpy(tmp_buf, fcb, sizeof(*fcb));
for (i = 0; i < numblocks; i++) {
memset(ecc_buf, 0, ecc_buf_size);
psrc = tmp_buf + i * blocksize;
pdst = buf + i * (blocksize + ecc_buf_size);
/* copy data byte aligned to destination buf */
memcpy(pdst, psrc, blocksize);
/*
* imx-kobs use a modified encode_bch which reverse the
* bit order of the data before calculating bch.
* Do this in the buffer and use the bch lib here.
*/
for (j = 0; j < blocksize; j++)
psrc[j] = reverse_bit(psrc[j]);
encode_bch(bch, psrc, blocksize, ecc_buf);
/* reverse ecc bit */
for (j = 0; j < ecc_buf_size; j++)
ecc_buf[j] = reverse_bit(ecc_buf[j]);
/* Here eccbuf is byte aligned and we can just copy it */
memcpy(pdst + blocksize, ecc_buf, ecc_buf_size);
}
kfree(ecc_buf);
kfree(tmp_buf);
free_bch(bch);
}
#else
static u8 calculate_parity_13_8(u8 d)
{
u8 p = 0;
p |= (GETBIT(d, 6) ^ GETBIT(d, 5) ^ GETBIT(d, 3) ^ GETBIT(d, 2)) << 0;
p |= (GETBIT(d, 7) ^ GETBIT(d, 5) ^ GETBIT(d, 4) ^ GETBIT(d, 2) ^
GETBIT(d, 1)) << 1;
p |= (GETBIT(d, 7) ^ GETBIT(d, 6) ^ GETBIT(d, 5) ^ GETBIT(d, 1) ^
GETBIT(d, 0)) << 2;
p |= (GETBIT(d, 7) ^ GETBIT(d, 4) ^ GETBIT(d, 3) ^ GETBIT(d, 0)) << 3;
p |= (GETBIT(d, 6) ^ GETBIT(d, 4) ^ GETBIT(d, 3) ^ GETBIT(d, 2) ^
GETBIT(d, 1) ^ GETBIT(d, 0)) << 4;
return p;
}
static void encode_hamming_13_8(void *_src, void *_ecc, size_t size)
{
int i;
u8 *src = _src;
u8 *ecc = _ecc;
for (i = 0; i < size; i++)
ecc[i] = calculate_parity_13_8(src[i]);
}
#endif
static u32 calc_chksum(void *buf, size_t size)
{
u32 chksum = 0;
u8 *bp = buf;
size_t i;
for (i = 0; i < size; i++)
chksum += bp[i];
return ~chksum;
}
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;
mxs_nand_get_layout(mtd, &l);
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;
fcb->meta_size = l.meta_size;
fcb->nr_blocks = l.nblocks;
fcb->ecc_nr = l.data0_size;
fcb->ecc_level = l.ecc0;
fcb->ecc_size = l.datan_size;
fcb->ecc_type = l.eccn;
fcb->bchtype = l.gf_len;
/* 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->disbbm = 0;
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 fill_dbbt_data(struct mtd_info *mtd, void *buf, int num_blocks)
{
int n, n_bad_blocks = 0;
u32 *bb = buf + 0x8;
u32 *n_bad_blocksp = buf + 0x4;
for (n = 0; n < num_blocks; n++) {
loff_t offset = (loff_t)n * mtd->erasesize;
if (mtd_block_isbad(mtd, offset)) {
n_bad_blocks++;
*bb = n;
bb++;
}
}
*n_bad_blocksp = n_bad_blocks;
return n_bad_blocks;
}
/*
* 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)
{
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 (!fcb_raw_page) {
debug("failed to allocate fcb_raw_page\n");
ret = -ENOMEM;
return ret;
}
/*
* 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_skip_bad(mtd, off, &size, NULL, mtd->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 = 0;
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 ((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) {
debug("failed to allocate fcb_raw_page\n");
ret = -ENOMEM;
return ret;
}
#if defined(CONFIG_MX6UL) || defined(CONFIG_MX6ULL)
/* 40 bit BCH, for i.MX6UL(L) */
encode_bch_ecc(fcb_raw_page + 32, fcb, 40);
#else
memcpy(fcb_raw_page + 12, fcb, sizeof(struct fcb_block));
encode_hamming_13_8(fcb_raw_page + 12,
fcb_raw_page + 12 + 512, 512);
#endif
/*
* Set the first and second byte of OOB data to 0xFF,
* not 0x00. These bytes are used as the Manufacturers Bad
* Block Marker (MBBM). Since the FCB is mostly written to
* the first page in a block, a scan for
* factory bad blocks will detect these blocks as bad, e.g.
* when function nand_scan_bbt() is executed to build a new
* bad block table.
*/
memset(fcb_raw_page + mtd->writesize, 0xFF, 2);
}
/* 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);
off += mtd->erasesize;
continue;
}
/*
* User BCH hardware module to generate 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_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");
} else if (plat_config.misc_flags & FCB_ENCODE_HAMMING) {
/* raw write */
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_write_oob(mtd, off, &ops);
printf("NAND FCB write to 0x%llx offset 0x%zx written: %s\n", off, ops.len, ret ? "ERROR" : "OK");
}
if (ret)
goto fcb_raw_page_err;
/* next writing location */
off += g_boot_search_stride;
}
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;
size_t actual_size;
struct mtd_info *mtd;
loff_t to;
int ret;
mtd = boot_cfg->mtd;
size = sizeof(struct dbbt_block);
ret = nand_read_skip_bad(mtd, off, &size, &actual_size, mtd->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 + actual_size - size;
size = mtd->writesize;
ret = nand_read_skip_bad(mtd, to, &size, NULL, mtd->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;
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)));
off += mtd->erasesize;
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) {
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");
if (ret)
return ret;
}
/* next writing location */
off += g_boot_search_stride;
}
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_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;
void *dbbt_page, *dbbt_data_page;
int ret;
loff_t maxsize, off;
mtd = boot_cfg->mtd;
maxsize = boot_cfg->maxsize;
off = boot_cfg->offset;
/* erase */
memset(&opts, 0, sizeof(opts));
opts.offset = off;
opts.length = maxsize - 1;
ret = nand_erase_opts(mtd, &opts);
if (ret) {
printf("%s: erase failed (ret = %d)\n", __func__, ret);
return ret;
}
/*
* Reference documentation from i.MX6DQRM section 8.5.2.2
*
* Nand Boot Control Block(BCB) contains two data structures,
* - Firmware Configuration Block(FCB)
* - Discovered Bad Block Table(DBBT)
*
* FCB contains,
* - nand timings
* - DBBT search page address,
* - start page address of primary firmware
* - start page address of secondary firmware
*
* setup fcb:
* - number of blocks = mtd partition size / mtd erasesize
* - two firmware blocks, primary and secondary
* - first 4 block for FCB/DBBT
* - rest split in half for primary and secondary firmware
* - same firmware write twice
*/
/* 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;
return ret;
}
fill_fcb(fcb, boot_cfg);
ret = write_fcb(boot_cfg, fcb);
/* fill dbbt */
dbbt_page = kzalloc(mtd->writesize, GFP_KERNEL);
if (!dbbt_page) {
debug("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");
ret = -ENOMEM;
goto dbbt_page_err;
}
dbbt = dbbt_page;
dbbt->checksum = 0;
dbbt->fingerprint = DBBT_FINGERPRINT;
dbbt->version = DBBT_VERSION_1;
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 dbbt */
ret = write_dbbt(boot_cfg, dbbt, dbbt_data_page);
if (ret < 0)
printf("failed to write FCB/DBBT\n");
dbbt_data_page_err:
kfree(dbbt_data_page);
dbbt_page_err:
kfree(dbbt_page);
fcb_err:
kfree(fcb);
err:
return ret;
}
static int do_nandbcb_bcbonly(int argc, char *const argv[])
{
struct fcb_block *fcb;
struct dbbt_block *dbbt;
struct mtd_info *mtd;
nand_erase_options_t opts;
size_t maxsize;
loff_t off;
void *dbbt_page, *dbbt_data_page;
int ret;
struct boot_config cfg;
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;
/* only get the partition info */
if (nandbcb_get_size(2, argv, 1, &cfg))
return CMD_RET_FAILURE;
if (nandbcb_set_boot_config(argc, argv, &cfg))
return CMD_RET_FAILURE;
mtd = cfg.mtd;
cfg.boot_stream1_address = hextoul(argv[2], NULL);
cfg.boot_stream1_size = hextoul(argv[3], NULL);
cfg.boot_stream1_size = ALIGN(cfg.boot_stream1_size, mtd->writesize);
if (argc > 5) {
cfg.boot_stream2_address = hextoul(argv[4], NULL);
cfg.boot_stream2_size = hextoul(argv[5], NULL);
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) {
printf("failed to allocate fcb\n");
ret = -ENOMEM;
return CMD_RET_FAILURE;
}
fill_fcb(fcb, &cfg);
/* write fcb */
ret = write_fcb(&cfg, fcb);
/* fill dbbt */
dbbt_page = kzalloc(mtd->writesize, GFP_KERNEL);
if (!dbbt_page) {
printf("failed to allocate dbbt_page\n");
ret = -ENOMEM;
goto fcb_err;
}
dbbt_data_page = kzalloc(mtd->writesize, GFP_KERNEL);
if (!dbbt_data_page) {
printf("failed to allocate dbbt_data_page\n");
ret = -ENOMEM;
goto dbbt_page_err;
}
dbbt = dbbt_page;
dbbt->checksum = 0;
dbbt->fingerprint = DBBT_FINGERPRINT;
dbbt->version = DBBT_VERSION_1;
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 dbbt */
ret = write_dbbt(&cfg, dbbt, dbbt_data_page);
dbbt_data_page_err:
kfree(dbbt_data_page);
dbbt_page_err:
kfree(dbbt_page);
fcb_err:
kfree(fcb);
if (ret < 0) {
printf("failed to write FCB/DBBT\n");
return CMD_RET_FAILURE;
}
return CMD_RET_SUCCESS;
}
/* dump data which is read from NAND chip */
void dump_structure(struct boot_config *boot_cfg, struct fcb_block *fcb,
struct dbbt_block *dbbt, void *dbbt_data_page)
{
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, fcb->x)
P1(datasetup);
P1(datahold);
P1(addr_setup);
P1(dsample_time);
P1(pagesize);
P1(oob_pagesize);
P1(sectors);
P1(nr_nand);
P1(nr_die);
P1(celltype);
P1(ecc_type);
P1(ecc_nr);
P1(ecc_size);
P1(ecc_level);
P1(meta_size);
P1(nr_blocks);
P1(ecc_type_sdk);
P1(ecc_nr_sdk);
P1(ecc_size_sdk);
P1(ecc_level_sdk);
P1(nr_blocks_sdk);
P1(meta_size_sdk);
P1(erase_th);
P1(bootpatch);
P1(patch_size);
P1(fw1_start);
P1(fw2_start);
P1(fw1_pages);
P1(fw2_pages);
P1(dbbt_start);
P1(bb_byte);
P1(bb_start_bit);
P1(phy_offset);
P1(bchtype);
P1(readlatency);
P1(predelay);
P1(cedelay);
P1(postdelay);
P1(cmdaddpause);
P1(datapause);
P1(tmspeed);
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, dbbt->x)
printf("DBBT :\n");
P1(checksum);
P1(fingerprint);
P1(version);
#undef P1
#define P1(x) printf(" %s = %d\n", #x, dbbt->x)
P1(dbbtpages);
#undef P1
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 bool check_fingerprint(void *data, int fingerprint)
{
int off = 4;
return (*(int *)(data + off) == fingerprint);
}
static int fuse_secondary_boot(u32 bank, u32 word, u32 mask, u32 off)
{
int err;
u32 val;
int ret;
err = fuse_read(bank, word, &val);
if (err)
return 0;
val = (val & mask) >> off;
if (val > 10)
return 0;
switch (val) {
case 0:
ret = 4;
break;
case 1:
ret = 1;
break;
default:
ret = 2 << val;
break;
}
return ret;
};
static int fuse_to_search_count(u32 bank, u32 word, u32 mask, u32 off)
{
int err;
u32 val;
int ret;
/* by default, the boot search count from fuse should be 2 */
err = fuse_read(bank, word, &val);
if (err)
return 2;
val = (val & mask) >> off;
switch (val) {
case 0:
ret = 2;
break;
case 1:
case 2:
case 3:
ret = 1 << val;
break;
default:
ret = 2;
}
return ret;
}
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;
dbbt_data_page = kzalloc(mtd->writesize, GFP_KERNEL);
if (!dbbt_data_page) {
printf("failed to allocate dbbt_data_page\n");
ret = -ENOMEM;
return ret;
}
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;
}
/* 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 {
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;
}
}
/* 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 {
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_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 (argc != 2)
return CMD_RET_USAGE;
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;
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_init(int argc, char * const argv[])
{
u_char *buf;
size_t size;
loff_t addr;
char *endp;
int ret;
struct boot_config cfg;
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;
if (nandbcb_get_size(argc, argv, 2, &cfg))
return CMD_RET_FAILURE;
size = cfg.boot_stream1_size;
if (nandbcb_set_boot_config(argc, argv, &cfg))
return CMD_RET_FAILURE;
addr = hextoul(argv[1], &endp);
if (*argv[1] == 0 || *endp != 0)
return CMD_RET_FAILURE;
buf = map_physmem(addr, size, MAP_WRBACK);
if (!buf) {
puts("failed to map physical memory\n");
return CMD_RET_FAILURE;
}
ret = nandbcb_init(&cfg, buf);
return ret == 0 ? CMD_RET_SUCCESS : CMD_RET_FAILURE;
}
static int do_nandbcb(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
const char *cmd;
int ret = 0;
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() || is_imx8mp()) {
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;
}
if ((plat_config.misc_flags) & BT_SEARCH_CNT_FROM_FUSE) {
if (is_imx8qxp())
g_boot_search_count = fuse_to_search_count(0, 720, 0xc0, 6);
if (is_imx8mn() || is_imx8mp())
g_boot_search_count = fuse_to_search_count(2, 2, 0x6000, 13);
printf("search count set to %d from fuse\n",
g_boot_search_count);
}
if (plat_config.misc_flags & FIRMWARE_SECONDARY_FIXED_ADDR) {
if (is_imx8mn())
g_boot_secondary_offset = fuse_secondary_boot(2, 1, 0xff0000, 16);
}
cmd = argv[1];
--argc;
++argv;
if (strcmp(cmd, "init") == 0) {
ret = do_nandbcb_init(argc, argv);
goto done;
}
if (strcmp(cmd, "dump") == 0) {
ret = do_nandbcb_dump(argc, argv);
goto done;
}
if (strcmp(cmd, "bcbonly") == 0) {
ret = do_nandbcb_bcbonly(argc, argv);
goto done;
}
done:
if (ret != -1)
return ret;
usage:
return CMD_RET_USAGE;
}
#ifdef CONFIG_SYS_LONGHELP
static char nandbcb_help_text[] =
"init addr off|partition len - update 'len' bytes starting at\n"
" 'off|part' to memory address 'addr', skipping bad blocks\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 off|partition - dump/verify boot structures\n";
#endif
U_BOOT_CMD(nandbcb, 7, 1, do_nandbcb,
"i.MX NAND Boot Control Blocks write",
nandbcb_help_text
);
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