ubi-utils: add ubiformat

A new utility to erase MTD devices and flash UBI images, while
preserving erase counters

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

2 files changed, 702 insertions, 2 deletions

diff --git a/ubi-utils/new-utils/Makefile b/ubi-utils/new-utils/Makefile
index 175187e..ba4c20f 100644
--- a/ubi-utils/new-utils/Makefile
+++ b/ubi-utils/new-utils/Makefile
@@ -12,9 +12,9 @@ INCLUDEDIR=/usr/include
 CC := $(CROSS)gcc
 CFLAGS := -Iinclude -Isrc -I$(KERNELHDR) $(OPTFLAGS) -Werror -Wall
 
-LIBS = libubi libubigen libiniparser
+LIBS = libubi libmtd libubigen libiniparser libscan
 UTILS = ubiupdatevol ubimkvol ubirmvol ubicrc32 ubinfo ubiattach \
-        ubidetach ubinize
+        ubidetach ubinize ubiformat
 
 vpath %.c src
 
@@ -38,10 +38,17 @@ ubicrc32: ubicrc32.o crc32.o
 ubinize: ubinize.o common.o crc32.o libiniparser.a libubigen.a
 	$(CC) $(CFLAGS) $(filter %.o, $^) -L. -liniparser -lubigen -o $@
 
+ubiformat: ubiformat.o common.o crc32.o libmtd.a libscan.a libubi.a libubigen.a
+	$(CC) $(CFLAGS) $(filter %.o, $^) -L. -lmtd -lscan -lubi -lubigen -o $@
+
 libubi.a: libubi.o
 	$(AR) crv $@ $^
 	ranlib $@
 
+libmtd.a: libmtd.o
+	$(AR) crv $@ $^
+	ranlib $@
+
 libubigen.a: libubigen.o
 	$(AR) crv $@ $^
 	ranlib $@
@@ -50,6 +57,10 @@ libiniparser.a: libiniparser.o dictionary.o
 	$(AR) crv $@ $^
 	ranlib $@
 
+libscan.a: libscan.o crc32.o
+	$(AR) crv $@ $^
+	ranlib $@
+
 clean:
 	rm -rf *.o $(addsuffix .a, $(LIBS)) $(UTILS) .*.c.dep
 
diff --git a/ubi-utils/new-utils/src/ubiformat.c b/ubi-utils/new-utils/src/ubiformat.c
new file mode 100644
index 0000000..e49c84b
--- /dev/null
+++ b/ubi-utils/new-utils/src/ubiformat.c
@@ -0,0 +1,689 @@
+/*
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ * An utility to format MTD devices into UBI and flash UBI images.
+ *
+ * Author: Artem Bityutskiy
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <fcntl.h>
+
+#include <libubi.h>
+#include <libmtd.h>
+#include <libscan.h>
+#include <libubigen.h>
+#include <mtd_swab.h>
+#include "crc32.h"
+#include "common.h"
+
+#define PROGRAM_VERSION "1.0"
+#define PROGRAM_NAME    "ubiformat"
+
+/* The variables below are set by command line arguments */
+struct args {
+	unsigned int yes:1;
+	unsigned int quiet:1;
+	unsigned int verbose:1;
+	unsigned int override_ec:1;
+	unsigned int novtbl:1;
+	int subpage_size;
+	int vid_hdr_offs;
+	int ubi_ver;
+	long long ec;
+	const char *image;
+	const char *node;
+};
+
+static struct args args =
+{
+	.ubi_ver = 1,
+};
+
+static const char *doc = PROGRAM_NAME " version " PROGRAM_VERSION
+		 " - a tool to format MTD devices and flash UBI images";
+
+static const char *optionsstr =
+"-s, --sub-page-size=<bytes>  minimum input/output unit used for UBI\n"
+"                             headers, e.g. sub-page size in case of NAND\n"
+"                             flash (equivalent to the minimum input/output\n"
+"                             unit size by default)\n"
+"-O, --vid-hdr-offset=<offs>  offset if the VID header from start of the\n"
+"                             physical eraseblock (default is the next\n"
+"                             minimum I/O unit or sub-page after the EC\n"
+"                             header)\n"
+"-n, --no-volume-table        only erase all eraseblock and preserve erase\n"
+"                             counters, do not write empty volume table\n"
+"-f, --flash-image=<file>     flash image file\n"
+"-e, --erase-counter=<value>  use <value> as the erase counter value for all\n"
+"                             eraseblocks\n"
+"-y, --yes                    assume the answer is \"yes\" for all question\n"
+"                             this program would otherwise ask\n"
+"-q, --quiet                  suppress progress percentage information\n"
+"-v, --verbose                be verbose\n"
+"-x, --ubi-ver=<num>          UBI version number to put to EC headers\n"
+"                             (default is 1)\n"
+"-h, -?, --help               print help message\n"
+"-V, --version                print program version\n";
+
+static const char *usage =
+"Usage: " PROGRAM_NAME " <MTD device node file name> [-h] [-V] [-y] [-q] [-v]\n"
+"\t\t\t[-x <num>] [-E <value>] [-s <bytes>] [-O <offs>] [-n]\n"
+"\t\t\t[--help] [--version] [--yes] [--verbose] [--quiet]\n"
+"\t\t\t[--ec=<value>] [--vid-hdr-offset=<offs>]\n"
+"\t\t\t[--ubi-ver=<num>] [--no-volume-table]\n\n"
+
+"Example 1: " PROGRAM_NAME " /dev/mtd0 -y - format MTD device number 0 and do\n"
+"           not ask questions.\n"
+"Example 2: " PROGRAM_NAME " /dev/mtd0 -q -e 0 - format MTD device number 0,\n"
+"           be quiet and force erase counter value 0.";
+
+static const struct option long_options[] = {
+	{ .name = "sub-page-size",   .has_arg = 1, .flag = NULL, .val = 's' },
+	{ .name = "vid-hdr-offset",  .has_arg = 1, .flag = NULL, .val = 'O' },
+	{ .name = "no-volume-table", .has_arg = 1, .flag = NULL, .val = 'n' },
+	{ .name = "flash-image",     .has_arg = 1, .flag = NULL, .val = 'f' },
+	{ .name = "yes",             .has_arg = 0, .flag = NULL, .val = 'y' },
+	{ .name = "erase-counter",   .has_arg = 0, .flag = NULL, .val = 'e' },
+	{ .name = "quiet",           .has_arg = 1, .flag = NULL, .val = 'q' },
+	{ .name = "verbose",         .has_arg = 1, .flag = NULL, .val = 'v' },
+	{ .name = "ubi-ver",         .has_arg = 1, .flag = NULL, .val = 'x' },
+	{ .name = "help",            .has_arg = 0, .flag = NULL, .val = 'h' },
+	{ .name = "version",         .has_arg = 0, .flag = NULL, .val = 'V' },
+	{ NULL, 0, NULL, 0},
+};
+
+static int parse_opt(int argc, char * const argv[])
+{
+	while (1) {
+		int key;
+		char *endp;
+
+		key = getopt_long(argc, argv, "nh?Vyqve:x:s:O:f:", long_options, NULL);
+		if (key == -1)
+			break;
+
+		switch (key) {
+		case 's':
+			args.subpage_size = ubiutils_get_bytes(optarg);
+			if (args.subpage_size <= 0)
+				return errmsg("bad sub-page size: \"%s\"", optarg);
+			break;
+
+		case 'O':
+			args.vid_hdr_offs = strtoul(optarg, &endp, 0);
+			if (endp == optarg || args.vid_hdr_offs < 0)
+				return errmsg("bad VID header offset: \"%s\"", optarg);
+			break;
+
+		case 'e':
+			args.ec = strtoull(optarg, &endp, 0);
+			if (endp == optarg || args.ec <= 0 || *endp != '\0')
+				return errmsg("bad erase counter value: \"%s\"", optarg);
+			if (args.ec >= EC_MAX)
+				return errmsg("too high erase %llu, counter, max is %u", args.ec, EC_MAX);
+			args.override_ec = 1;
+			break;
+
+		case 'f':
+			args.image = optarg;
+			break;
+
+		case 'n':
+			args.novtbl = 1;
+			break;
+
+		case 'y':
+			args.yes = 1;
+			break;
+
+		case 'q':
+			args.quiet = 1;
+			break;
+
+		case 'x':
+			args.ubi_ver = strtoul(optarg, &endp, 0);
+			if (endp == optarg || args.ubi_ver < 0)
+				return errmsg("bad UBI version: \"%s\"", optarg);
+			break;
+
+		case 'v':
+			args.verbose = 1;
+			break;
+
+		case 'V':
+			fprintf(stderr, "%s\n", PROGRAM_VERSION);
+			exit(EXIT_SUCCESS);
+
+		case 'h':
+		case '?':
+			fprintf(stderr, "%s\n\n", doc);
+			fprintf(stderr, "%s\n\n", usage);
+			fprintf(stderr, "%s\n", optionsstr);
+			exit(EXIT_SUCCESS);
+
+		case ':':
+			return errmsg("parameter is missing");
+
+		default:
+			fprintf(stderr, "Use -h for help\n");
+			return -1;
+		}
+	}
+
+	if (args.quiet && args.verbose)
+		return errmsg("using \"-q\" and \"-v\" at the same time does not make sense");
+
+	if (optind == argc)
+		return errmsg("MTD device name was not specified (use -h for help)");
+	else if (optind != argc - 1)
+		return errmsg("more then one MTD device specified (use -h for help)");
+
+	if (args.image && args.novtbl)
+		return errmsg("-n cannot be used together with -f");
+
+	args.node = argv[optind];
+	return 0;
+}
+
+static int want_exit(void)
+{
+	char buf[4];
+
+	while (1) {
+		normsg_cont("continue? (yes/no)  ");
+		scanf("%3s", buf);
+		if (!strncmp(buf, "yes", 3) || !strncmp(buf, "y", 1))
+			return 0;
+		if (!strncmp(buf, "no", 2) || !strncmp(buf, "n", 1))
+			return 1;
+	}
+}
+
+static int answer_is_yes(void)
+{
+	char buf[4];
+
+	while (1) {
+		scanf("%3s", buf);
+		if (!strncmp(buf, "yes", 3) || !strncmp(buf, "y", 1))
+			return 1;
+		if (!strncmp(buf, "no", 2) || !strncmp(buf, "n", 1))
+			return 0;
+	}
+}
+
+static void print_bad_eraseblocks(const struct mtd_info *mtd,
+				  const struct ubi_scan_info *si)
+{
+	int first = 1, eb;
+
+	if (si->bad_cnt == 0)
+		return;
+
+	normsg_cont("bad blocks eraseblocks: ");
+	for (eb = 0; eb < mtd->eb_cnt; eb++) {
+		if (si->ec[eb] != EB_BAD)
+			continue;
+		if (first) {
+			printf("%d", eb);
+			first = 0;
+		} else
+			printf(", %d", eb);
+	}
+	printf("\n");
+}
+
+static int change_ec(struct ubi_ec_hdr *hdr, long long ec)
+{
+	uint32_t crc;
+
+	/* Check the EC header */
+	if (be32_to_cpu(hdr->magic) != UBI_EC_HDR_MAGIC)
+		return errmsg("mad UBI magic %#08x, should be %#08x",
+			      be32_to_cpu(hdr->magic), UBI_EC_HDR_MAGIC);
+
+	crc = crc32(UBI_CRC32_INIT, hdr, UBI_EC_HDR_SIZE_CRC);
+	if (be32_to_cpu(hdr->hdr_crc) != crc)
+		return errmsg("bad CRC %#08x, should be %#08x\n",
+			      crc, be32_to_cpu(hdr->hdr_crc));
+
+	hdr->ec = cpu_to_be64(ec);
+	crc = crc32(UBI_CRC32_INIT, hdr, UBI_EC_HDR_SIZE_CRC);
+	hdr->hdr_crc = cpu_to_be32(crc);
+
+	return 0;
+}
+
+static int drop_ffs(const struct mtd_info *mtd, const void *buf, int len)
+{
+	int i;
+
+        for (i = len - 1; i >= 0; i--)
+	       if (((const uint8_t *)buf)[i] != 0xFF)
+		      break;
+
+        /* The resulting length must be aligned to the minimum flash I/O size */
+        len = i + 1;
+	len = (len + mtd->min_io_size - 1) / mtd->min_io_size;
+	len *=  mtd->min_io_size;
+        return len;
+}
+
+static int flash_image(const struct mtd_info *mtd, const struct ubigen_info *ui,
+		       struct ubi_scan_info *si)
+{
+	int fd, img_ebs, eb, written_ebs = 0;
+	struct stat st;
+
+	if (stat(args.image, &st))
+		return sys_errmsg("cannot open \"%s\"", args.image);
+
+	img_ebs = st.st_size / mtd->eb_size;
+	if (img_ebs > si->good_cnt)
+		return sys_errmsg("file \"%s\" is too large (%lld bytes)",
+				  args.image, (long long)st.st_size);
+
+	if (st.st_size % mtd->eb_size)
+		return sys_errmsg("file \"%s\" (size %lld bytes) is not multiple of eraseblock size (%d bytes)",
+				  args.image, (long long)st.st_size, mtd->eb_size);
+
+	fd = open(args.image, O_RDONLY);
+	if (fd == -1)
+		return sys_errmsg("cannot open \"%s\"", args.image);
+
+	verbose(args.verbose, "will write %d eraseblocks", img_ebs);
+	for (eb = 0; eb < mtd->eb_cnt; eb++) {
+		int err, new_len;
+		char buf[mtd->eb_size];
+		long long ec;
+
+		if (!args.quiet && !args.verbose) {
+			printf("\r" PROGRAM_NAME ": flashing eraseblock %d -- %2lld %% complete  ",
+			       eb, (long long)(eb + 1) * 100 / img_ebs);
+			fflush(stdout);
+		}
+
+		if (si->ec[eb] == EB_BAD)
+			continue;
+
+		if (args.verbose) {
+			normsg_cont("eraseblock %d: erase", eb);
+			fflush(stdout);
+		}
+
+		err = mtd_erase(mtd, eb);
+		if (err) {
+			sys_errmsg("failed to erase eraseblock %d", eb);
+			goto out_close;
+		}
+
+		if (read(fd, buf, mtd->eb_size) != mtd->eb_size) {
+			sys_errmsg("failed to read eraseblock %d from \"%s\"",
+				   written_ebs, args.image);
+			goto out_close;
+		}
+
+
+		if (si->ec[eb] <= EC_MAX)
+			ec = si->ec[eb] + 1;
+		else if (!args.override_ec)
+			ec = si->mean_ec;
+		else
+			ec = args.ec;
+
+		if (args.verbose) {
+			printf(", change EC to %lld", ec);
+			fflush(stdout);
+		}
+
+		err = change_ec((struct ubi_ec_hdr *)buf, ec);
+		if (err) {
+			errmsg("bad EC header at eraseblock %d of \"%s\"",
+			       written_ebs, args.image);
+			goto out_close;
+		}
+
+		if (args.verbose) {
+			printf(", write data\n");
+			fflush(stdout);
+		}
+
+		new_len = drop_ffs(mtd, buf, mtd->eb_size);
+
+		err = mtd_write(mtd, eb, 0, buf, new_len);
+		if (err) {
+			sys_errmsg("cannot write eraseblock %d", eb);
+			goto out_close;
+		}
+		if (++written_ebs >= img_ebs)
+			break;
+	}
+
+	if (!args.quiet && !args.verbose)
+		printf("\n");
+	close(fd);
+	return eb + 1;
+
+out_close:
+	close(fd);
+	return -1;
+}
+
+static int format(const struct mtd_info *mtd, const struct ubigen_info *ui,
+		  const struct ubi_scan_info *si, int start_eb, int novtbl)
+{
+	int eb, err, write_size;
+	struct ubi_ec_hdr *hdr;
+	struct ubi_vtbl_record *vtbl;
+	int eb1 = -1, eb2 = -1;
+	long long ec1 = -1, ec2 = -1;
+
+	write_size = UBI_EC_HDR_SIZE + mtd->subpage_size - 1;
+	write_size /= mtd->subpage_size;
+	write_size *= mtd->subpage_size;
+	hdr = malloc(write_size);
+	if (!hdr)
+		return sys_errmsg("cannot allocate %d bytes of memory", write_size);
+
+	memset(hdr, 0xFF, write_size);
+
+	for (eb = start_eb; eb < mtd->eb_cnt; eb++) {
+		long long ec;
+
+		if (!args.quiet && !args.verbose) {
+			printf("\r" PROGRAM_NAME ": formatting eraseblock %d -- %2lld %% complete  ",
+			       eb, (long long)(eb + 1 - start_eb) * 100 / (mtd->eb_cnt - start_eb));
+			fflush(stdout);
+		}
+
+		if (si->ec[eb] == EB_BAD)
+			continue;
+
+		if (si->ec[eb] <= EC_MAX)
+			ec = si->ec[eb] + 1;
+		else if (!args.override_ec)
+			ec = si->mean_ec;
+		else
+			ec = args.ec;
+		ubigen_init_ec_hdr(ui, hdr, ec);
+
+		if (args.verbose) {
+			normsg_cont("eraseblock %d: erase", eb);
+			fflush(stdout);
+		}
+
+		err = mtd_erase(mtd, eb);
+		if (err) {
+			sys_errmsg("failed to erase eraseblock %d", eb);
+			goto out_free;
+		}
+
+		if ((eb1 == -1 || eb2 == -1) && !novtbl) {
+			if (eb1 == -1) {
+				eb1 = eb;
+				ec1 = ec;
+			} else if (eb2 == -1) {
+				eb2 = eb;
+				ec2 = ec;
+			}
+			if (args.verbose)
+				printf(", do not write EC, leave for vtbl\n");
+			continue;
+		}
+
+		if (args.verbose) {
+			printf(", write EC %lld\n", ec);
+			fflush(stdout);
+		}
+
+		err = mtd_write(mtd, eb, 0, hdr, write_size);
+		if (err) {
+			sys_errmsg("cannot write EC header (%d bytes buffer) to eraseblock %d",
+				   write_size, eb);
+			if (args.subpage_size != mtd->min_io_size)
+				normsg("may be %d is incorrect?", args.subpage_size);
+			goto out_free;
+		}
+	}
+
+	if (!args.quiet && !args.verbose)
+		printf("\n");
+
+	if (!novtbl) {
+		if (eb1 == -1 || eb2 == -1) {
+			errmsg("no eraseblocks for volume table");
+			goto out_free;
+		}
+
+		verbose(args.verbose, "write volume table to eraseblocks %d and %d", eb1, eb2);
+		vtbl = ubigen_create_empty_vtbl(ui);
+		if (!vtbl)
+			goto out_free;
+
+		err = ubigen_write_layout_vol(ui, eb1, eb2, ec1,  ec2, vtbl, mtd->fd);
+		free(vtbl);
+		if (err) {
+			errmsg("cannot write layout volume");
+			goto out_free;
+		}
+	}
+
+	free(hdr);
+	return 0;
+
+out_free:
+	free(hdr);
+	return -1;
+}
+
+int main(int argc, char * const argv[])
+{
+	int err, verbose;
+	struct mtd_info mtd;
+	libubi_t libubi;
+	struct ubigen_info ui;
+	struct ubi_scan_info *si;
+
+	err = parse_opt(argc, argv);
+	if (err)
+		return -1;
+
+	err = mtd_get_info(args.node, &mtd);
+	if (err)
+		return errmsg("cannot get information about \"%s\"", args.node);
+
+	if (args.subpage_size == 0)
+		args.subpage_size = mtd.min_io_size;
+	else if (args.subpage_size > mtd.min_io_size ||
+		 mtd.min_io_size % args.subpage_size) {
+		errmsg("bad sub-page size %d", args.subpage_size);
+		goto out_close;
+	}
+
+	/*
+	 * Because of MTD interface limitations 'mtd_get_info()' cannot get
+	 * sub-page so we force the user to pass it via the command line. Let's
+	 * hope the user passed us something sane.
+	 */
+	mtd.subpage_size = args.subpage_size;
+
+	if (mtd.rdonly) {
+		errmsg("mtd%d (%s) is a read-only device", mtd.num, args.node);
+		goto out_close;
+	}
+
+	/* Make sure this MTD device is not attached to UBI */
+	libubi = libubi_open(0);
+	if (libubi) {
+		int ubi_dev_num;
+
+		err = mtd_num2ubi_dev(libubi, mtd.num, &ubi_dev_num);
+		libubi_close(libubi);
+		if (!err) {
+			errmsg("please, first detach mtd%d (%s) from ubi%d",
+			       mtd.num, args.node, ubi_dev_num);
+			goto out_close;
+		}
+	}
+
+	if (!args.quiet) {
+		normsg_cont("mtd%d (%s), size ", mtd.num, mtd.type_str);
+		ubiutils_print_bytes(mtd.size, 1);
+		printf(", %d eraseblocks of ", mtd.eb_size);
+		ubiutils_print_bytes(mtd.eb_size, 1);
+		printf(", min. I/O size %d bytes\n", mtd.min_io_size);
+	}
+
+	if (args.quiet)
+		verbose = 0;
+	else if (args.verbose)
+		verbose = 2;
+	else
+		verbose = 1;
+	err = ubi_scan(&mtd, &si, verbose);
+	if (err) {
+		errmsg("failed to scan mtd%d (%s)", mtd.num, args.node);
+		goto out_close;
+	}
+
+	if (si->good_cnt == 0) {
+		errmsg("all %d eraseblocks are bad", si->bad_cnt);
+		goto out_free;
+	}
+
+	if (si->good_cnt < 2 && (!args.novtbl || args.image)) {
+		errmsg("too few non-bad eraseblocks (%d) on mtd%d", si->good_cnt, mtd.num);
+		goto out_free;
+	}
+
+	if (!args.quiet) {
+		if (si->ok_cnt)
+			normsg("%d eraseblocks have valid erase counter, mean value is %lld",
+			       si->ok_cnt, si->mean_ec);
+		if (si->empty_cnt)
+			normsg("%d eraseblocks are supposedly empty", si->empty_cnt);
+		if (si->corrupted_cnt)
+			normsg("%d corrupted erase counters", si->corrupted_cnt);
+		print_bad_eraseblocks(&mtd, si);
+	}
+
+	if (si->alien_cnt) {
+		if (!args.yes || !args.quiet)
+			warnmsg("%d of %d eraseblocks contain non-ubifs data",
+				si->alien_cnt, si->good_cnt);
+		if (!args.yes && want_exit()) {
+			if (args.yes && !args.quiet)
+				printf("yes\n");
+			goto out_free;
+		}
+	}
+
+	if (!args.override_ec && si->empty_cnt < si->good_cnt) {
+		int percent = ((double)si->ok_cnt)/si->good_cnt * 100;
+
+		/*
+		 * Make sure the majority of eraseblocks have valid
+		 * erase counters.
+		 */
+		if (percent < 50) {
+			if (!args.yes || !args.quiet)
+				warnmsg("only %d of %d eraseblocks have valid erase counter",
+					si->ok_cnt, si->good_cnt);
+				normsg("erase counter 0 will be used for all eraseblocks");
+				normsg("note, arbitrary erase counter value may be specified using -e option");
+			if (!args.yes && want_exit()) {
+				if (args.yes && !args.quiet)
+					printf("yes\n");
+				goto out_free;
+			}
+			 args.ec = 0;
+			 args.override_ec = 1;
+		} else if (percent < 95) {
+			if (!args.yes || !args.quiet)
+				warnmsg("only %d of %d eraseblocks have valid erase counter",
+					si->ok_cnt, si->good_cnt);
+				normsg("mean erase counter %lld will be used for the rest of eraseblock",
+				       si->mean_ec);
+			if (!args.yes && want_exit()) {
+				if (args.yes && !args.quiet)
+					printf("yes\n");
+				goto out_free;
+			}
+			args.ec = si->mean_ec;
+			args.override_ec = 1;
+		}
+	}
+
+	if (!args.quiet && args.override_ec)
+		normsg("use erase counter %lld for all eraseblocks", args.ec);
+
+	ubigen_info_init(&ui, mtd.eb_size, mtd.min_io_size, args.subpage_size,
+			 args.vid_hdr_offs, args.ubi_ver);
+
+	if (si->vid_hdr_offs != -1 && ui.vid_hdr_offs != si->vid_hdr_offs) {
+		/*
+		 * Hmm, what we read from flash and what we calculated using
+		 * min. I/O unit size and sub-page size differs.
+		 */
+		if (!args.yes || !args.quiet) {
+			warnmsg("VID header and data offsets on flash are %d and %d, "
+				"which is different to calculated offsets %d and %d",
+				si->vid_hdr_offs, si->data_offs, ui.vid_hdr_offs,
+				ui.data_offs);
+			normsg_cont("use old offsets %d and %d? (yes/no)  ",
+				    si->vid_hdr_offs, si->data_offs);
+		}
+		if (args.yes || answer_is_yes()) {
+			if (args.yes && !args.quiet)
+				printf("yes\n");
+			ui.vid_hdr_offs = si->vid_hdr_offs;
+			ui.data_offs = si->data_offs;
+		}
+	}
+
+	if (args.image) {
+		err = flash_image(&mtd, &ui, si);
+		if (err < 0)
+			goto out_free;
+
+		err = format(&mtd, &ui, si, err, 1);
+		if (err)
+			goto out_free;
+	} else {
+		err = format(&mtd, &ui, si, 0, args.novtbl);
+		if (err)
+			goto out_free;
+	}
+
+	ubi_scan_free(si);
+	close(mtd.fd);
+	return 0;
+
+out_free:
+	ubi_scan_free(si);
+out_close:
+	close(mtd.fd);
+	return -1;
+}