build/mtd-utils/mtd_debug.c - nest-cam/v366/mtd-utils - Git at Google

 /*
  * Copyright (c) 2d3D, Inc.
  * Written by Abraham vd Merwe <abraham@2d3d.co.za>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *	  notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *	  notice, this list of conditions and the following disclaimer in the
  *	  documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the author nor the names of other contributors
  *	  may be used to endorse or promote products derived from this software
  *	  without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #define PROGRAM_NAME "mtd_debug"

 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <mtd/mtd-user.h>
 #include "common.h"

 /*
  * MEMGETINFO
  */
 static int getmeminfo(int fd, struct mtd_info_user *mtd)
 {
 	return ioctl(fd, MEMGETINFO, mtd);
 }

 /*
  * MEMERASE
  */
 static int memerase(int fd, struct erase_info_user *erase)
 {
 	return ioctl(fd, MEMERASE, erase);
 }

 /*
  * MEMGETREGIONCOUNT
  * MEMGETREGIONINFO
  */
 static int getregions(int fd, struct region_info_user *regions, int *n)
 {
 	int i, err;
 	err = ioctl(fd, MEMGETREGIONCOUNT, n);
 	if (err)
 		return err;
 	for (i = 0; i < *n; i++) {
 		regions[i].regionindex = i;
 		err = ioctl(fd, MEMGETREGIONINFO, &regions[i]);
 		if (err)
 			return err;
 	}
 	return 0;
 }

 int erase_flash(int fd, u_int32_t offset, u_int32_t bytes)
 {
 	int err;
 	struct erase_info_user erase;
 	erase.start = offset;
 	erase.length = bytes;
 	err = memerase(fd, &erase);
 	if (err < 0) {
 		perror("MEMERASE");
 		return 1;
 	}
 	fprintf(stderr, "Erased %d bytes from address 0x%.8x in flash\n", bytes, offset);
 	return 0;
 }

 void printsize(u_int32_t x)
 {
 	int i;
 	static const char *flags = "KMGT";
 	printf("%u ", x);
 	for (i = 0; x >= 1024 && flags[i] != '\0'; i++)
 		x /= 1024;
 	i--;
 	if (i >= 0)
 		printf("(%u%c)", x, flags[i]);
 }

 int flash_to_file(int fd, off_t offset, size_t len, const char *filename)
 {
 	u_int8_t *buf = NULL;
 	int outfd, err;
 	int size = len * sizeof(u_int8_t);
 	int n = len;

 	if (offset != lseek(fd, offset, SEEK_SET)) {
 		perror("lseek()");
 		goto err0;
 	}
 	outfd = creat(filename, 0666);
 	if (outfd < 0) {
 		perror("creat()");
 		goto err1;
 	}

 retry:
 	if ((buf = (u_int8_t *) malloc(size)) == NULL) {
 #define BUF_SIZE	(64 * 1024 * sizeof(u_int8_t))
 		fprintf(stderr, "%s: malloc(%#x)\n", __func__, size);
 		if (size != BUF_SIZE) {
 			size = BUF_SIZE;
 			fprintf(stderr, "%s: trying buffer size %#x\n", __func__, size);
 			goto retry;
 		}
 		perror("malloc()");
 		goto err0;
 	}
 	do {
 		if (n <= size)
 			size = n;
 		err = read(fd, buf, size);
 		if (err < 0) {
 			fprintf(stderr, "%s: read, size %#x, n %#x\n", __func__, size, n);
 			perror("read()");
 			goto err2;
 		}
 		err = write(outfd, buf, size);
 		if (err < 0) {
 			fprintf(stderr, "%s: write, size %#x, n %#x\n", __func__, size, n);
 			perror("write()");
 			goto err2;
 		}
 		if (err != size) {
 			fprintf(stderr, "Couldn't copy entire buffer to %s. (%d/%d bytes copied)\n", filename, err, size);
 			goto err2;
 		}
 		n -= size;
 	} while (n > 0);

 	if (buf != NULL)
 		free(buf);
 	close(outfd);
 	printf("Copied %zu bytes from address 0x%.8"PRIxoff_t" in flash to %s\n", len, offset, filename);
 	return 0;

 err2:
 	close(outfd);
 err1:
 	if (buf != NULL)
 		free(buf);
 err0:
 	return 1;
 }

 int file_to_flash(int fd, off_t offset, u_int32_t len, const char *filename)
 {
 	u_int8_t *buf = NULL;
 	FILE *fp;
 	int err;
 	int size = len * sizeof(u_int8_t);
 	int n = len;

 	if (offset != lseek(fd, offset, SEEK_SET)) {
 		perror("lseek()");
 		return 1;
 	}
 	if ((fp = fopen(filename, "r")) == NULL) {
 		perror("fopen()");
 		return 1;
 	}
 retry:
 	if ((buf = (u_int8_t *) malloc(size)) == NULL) {
 		fprintf(stderr, "%s: malloc(%#x) failed\n", __func__, size);
 		if (size != BUF_SIZE) {
 			size = BUF_SIZE;
 			fprintf(stderr, "%s: trying buffer size %#x\n", __func__, size);
 			goto retry;
 		}
 		perror("malloc()");
 		fclose(fp);
 		return 1;
 	}
 	do {
 		if (n <= size)
 			size = n;
 		if (fread(buf, size, 1, fp) != 1 || ferror(fp)) {
 			fprintf(stderr, "%s: fread, size %#x, n %#x\n", __func__, size, n);
 			perror("fread()");
 			free(buf);
 			fclose(fp);
 			return 1;
 		}
 		err = write(fd, buf, size);
 		if (err < 0) {
 			fprintf(stderr, "%s: write, size %#x, n %#x\n", __func__, size, n);
 			perror("write()");
 			free(buf);
 			fclose(fp);
 			return 1;
 		}
 		n -= size;
 	} while (n > 0);

 	if (buf != NULL)
 		free(buf);
 	fclose(fp);
 	printf("Copied %d bytes from %s to address 0x%.8"PRIxoff_t" in flash\n", len, filename, offset);
 	return 0;
 }

 int showinfo(int fd)
 {
 	int i, err, n;
 	struct mtd_info_user mtd;
 	static struct region_info_user region[1024];

 	err = getmeminfo(fd, &mtd);
 	if (err < 0) {
 		perror("MEMGETINFO");
 		return 1;
 	}

 	err = getregions(fd, region, &n);
 	if (err < 0) {
 		perror("MEMGETREGIONCOUNT");
 		return 1;
 	}

 	printf("mtd.type = ");
 	switch (mtd.type) {
 		case MTD_ABSENT:
 			printf("MTD_ABSENT");
 			break;
 		case MTD_RAM:
 			printf("MTD_RAM");
 			break;
 		case MTD_ROM:
 			printf("MTD_ROM");
 			break;
 		case MTD_NORFLASH:
 			printf("MTD_NORFLASH");
 			break;
 		case MTD_NANDFLASH:
 			printf("MTD_NANDFLASH");
 			break;
 		case MTD_MLCNANDFLASH:
 			printf("MTD_MLCNANDFLASH");
 			break;
 		case MTD_DATAFLASH:
 			printf("MTD_DATAFLASH");
 			break;
 		case MTD_UBIVOLUME:
 			printf("MTD_UBIVOLUME");
 		default:
 			printf("(unknown type - new MTD API maybe?)");
 	}

 	printf("\nmtd.flags = ");
 	if (mtd.flags == MTD_CAP_ROM)
 		printf("MTD_CAP_ROM");
 	else if (mtd.flags == MTD_CAP_RAM)
 		printf("MTD_CAP_RAM");
 	else if (mtd.flags == MTD_CAP_NORFLASH)
 		printf("MTD_CAP_NORFLASH");
 	else if (mtd.flags == MTD_CAP_NANDFLASH)
 		printf("MTD_CAP_NANDFLASH");
 	else if (mtd.flags == MTD_WRITEABLE)
 		printf("MTD_WRITEABLE");
 	else {
 		int first = 1;
 		static struct {
 			const char *name;
 			int value;
 		} flags[] =
 		{
 			{ "MTD_WRITEABLE", MTD_WRITEABLE },
 			{ "MTD_BIT_WRITEABLE", MTD_BIT_WRITEABLE },
 			{ "MTD_NO_ERASE", MTD_NO_ERASE },
 			{ "MTD_POWERUP_LOCK", MTD_POWERUP_LOCK },
 			{ NULL, -1 }
 		};
 		for (i = 0; flags[i].name != NULL; i++) {
 			if (mtd.flags & flags[i].value) {
 				if (first) {
 					printf("%s", flags[i].name);
 					first = 0;
 				} else {
 					printf(" | %s", flags[i].name);
 				}
 			}
 		}
 	}

 	printf("\nmtd.size = ");
 	printsize(mtd.size);

 	printf("\nmtd.erasesize = ");
 	printsize(mtd.erasesize);

 	printf("\nmtd.writesize = ");
 	printsize(mtd.writesize);

 	printf("\nmtd.oobsize = ");
 	printsize(mtd.oobsize);

 	printf("\nregions = %d\n\n", n);

 	for (i = 0; i < n; i++) {
 		printf("region[%d].offset = 0x%.8x\n"
 				"region[%d].erasesize = ",
 				i, region[i].offset, i);
 		printsize(region[i].erasesize);
 		printf("\nregion[%d].numblocks = %d\n"
 				"region[%d].regionindex = %d\n",
 				i, region[i].numblocks,
 				i, region[i].regionindex);
 	}
 	return 0;
 }

 void showusage(void)
 {
 	fprintf(stderr, "usage: %1$s info <device>\n"
 			"       %1$s read <device> <offset> <len> <dest-filename>\n"
 			"       %1$s write <device> <offset> <len> <source-filename>\n"
 			"       %1$s erase <device> <offset> <len>\n",
 			PROGRAM_NAME);
 	exit(EXIT_FAILURE);
 }

 int main(int argc, char *argv[])
 {
 	int err = 0, fd;
 	int open_flag;

 	enum {
 		OPT_INFO,
 		OPT_READ,
 		OPT_WRITE,
 		OPT_ERASE
 	} option = OPT_INFO;

 	/* parse command-line options */
 	if (argc == 3 && !strcmp(argv[1], "info"))
 		option = OPT_INFO;
 	else if (argc == 6 && !strcmp(argv[1], "read"))
 		option = OPT_READ;
 	else if (argc == 6 && !strcmp(argv[1], "write"))
 		option = OPT_WRITE;
 	else if (argc == 5 && !strcmp(argv[1], "erase"))
 		option = OPT_ERASE;
 	else
 		showusage();

 	/* open device */
 	open_flag = (option == OPT_INFO || option == OPT_READ) ? O_RDONLY : O_RDWR;
 	if ((fd = open(argv[2], O_SYNC | open_flag)) < 0)
 		errmsg_die("open()");

 	switch (option) {
 		case OPT_INFO:
 			showinfo(fd);
 			break;
 		case OPT_READ:
 			err = flash_to_file(fd, strtoll(argv[3], NULL, 0), strtoul(argv[4], NULL, 0), argv[5]);
 			break;
 		case OPT_WRITE:
 			err = file_to_flash(fd, strtoll(argv[3], NULL, 0), strtoul(argv[4], NULL, 0), argv[5]);
 			break;
 		case OPT_ERASE:
 			err = erase_flash(fd, strtoul(argv[3], NULL, 0), strtoul(argv[4], NULL, 0));
 			break;
 	}

 	/* close device */
 	if (close(fd) < 0)
 		errmsg_die("close()");

 	return err;
 }
	/*
	* Copyright (c) 2d3D, Inc.
	* Written by Abraham vd Merwe <abraham@2d3d.co.za>
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of the author nor the names of other contributors
	* may be used to endorse or promote products derived from this software
	* without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#define PROGRAM_NAME "mtd_debug"

	#include <stdio.h>
	#include <stdlib.h>
	#include <errno.h>
	#include <string.h>
	#include <unistd.h>
	#include <sys/ioctl.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <fcntl.h>
	#include <mtd/mtd-user.h>
	#include "common.h"

	/*
	* MEMGETINFO
	*/
	static int getmeminfo(int fd, struct mtd_info_user *mtd)
	{
	return ioctl(fd, MEMGETINFO, mtd);
	}

	/*
	* MEMERASE
	*/
	static int memerase(int fd, struct erase_info_user *erase)
	{
	return ioctl(fd, MEMERASE, erase);
	}

	/*
	* MEMGETREGIONCOUNT
	* MEMGETREGIONINFO
	*/
	static int getregions(int fd, struct region_info_user regions, int n)
	{
	int i, err;
	err = ioctl(fd, MEMGETREGIONCOUNT, n);
	if (err)
	return err;
	for (i = 0; i < *n; i++) {
	regions[i].regionindex = i;
	err = ioctl(fd, MEMGETREGIONINFO, &regions[i]);
	if (err)
	return err;
	}
	return 0;
	}

	int erase_flash(int fd, u_int32_t offset, u_int32_t bytes)
	{
	int err;
	struct erase_info_user erase;
	erase.start = offset;
	erase.length = bytes;
	err = memerase(fd, &erase);
	if (err < 0) {
	perror("MEMERASE");
	return 1;
	}
	fprintf(stderr, "Erased %d bytes from address 0x%.8x in flash\n", bytes, offset);
	return 0;
	}

	void printsize(u_int32_t x)
	{
	int i;
	static const char *flags = "KMGT";
	printf("%u ", x);
	for (i = 0; x >= 1024 && flags[i] != '\0'; i++)
	x /= 1024;
	i--;
	if (i >= 0)
	printf("(%u%c)", x, flags[i]);
	}

	int flash_to_file(int fd, off_t offset, size_t len, const char *filename)
	{
	u_int8_t *buf = NULL;
	int outfd, err;
	int size = len * sizeof(u_int8_t);
	int n = len;

	if (offset != lseek(fd, offset, SEEK_SET)) {
	perror("lseek()");
	goto err0;
	}
	outfd = creat(filename, 0666);
	if (outfd < 0) {
	perror("creat()");
	goto err1;
	}

	retry:
	if ((buf = (u_int8_t *) malloc(size)) == NULL) {
	#define BUF_SIZE (64 * 1024 * sizeof(u_int8_t))
	fprintf(stderr, "%s: malloc(%#x)\n", __func__, size);
	if (size != BUF_SIZE) {
	size = BUF_SIZE;
	fprintf(stderr, "%s: trying buffer size %#x\n", __func__, size);
	goto retry;
	}
	perror("malloc()");
	goto err0;
	}
	do {
	if (n <= size)
	size = n;
	err = read(fd, buf, size);
	if (err < 0) {
	fprintf(stderr, "%s: read, size %#x, n %#x\n", __func__, size, n);
	perror("read()");
	goto err2;
	}
	err = write(outfd, buf, size);
	if (err < 0) {
	fprintf(stderr, "%s: write, size %#x, n %#x\n", __func__, size, n);
	perror("write()");
	goto err2;
	}
	if (err != size) {
	fprintf(stderr, "Couldn't copy entire buffer to %s. (%d/%d bytes copied)\n", filename, err, size);
	goto err2;
	}
	n -= size;
	} while (n > 0);

	if (buf != NULL)
	free(buf);
	close(outfd);
	printf("Copied %zu bytes from address 0x%.8"PRIxoff_t" in flash to %s\n", len, offset, filename);
	return 0;

	err2:
	close(outfd);
	err1:
	if (buf != NULL)
	free(buf);
	err0:
	return 1;
	}

	int file_to_flash(int fd, off_t offset, u_int32_t len, const char *filename)
	{
	u_int8_t *buf = NULL;
	FILE *fp;
	int err;
	int size = len * sizeof(u_int8_t);
	int n = len;

	if (offset != lseek(fd, offset, SEEK_SET)) {
	perror("lseek()");
	return 1;
	}
	if ((fp = fopen(filename, "r")) == NULL) {
	perror("fopen()");
	return 1;
	}
	retry:
	if ((buf = (u_int8_t *) malloc(size)) == NULL) {
	fprintf(stderr, "%s: malloc(%#x) failed\n", __func__, size);
	if (size != BUF_SIZE) {
	size = BUF_SIZE;
	fprintf(stderr, "%s: trying buffer size %#x\n", __func__, size);
	goto retry;
	}
	perror("malloc()");
	fclose(fp);
	return 1;
	}
	do {
	if (n <= size)
	size = n;
	if (fread(buf, size, 1, fp) != 1 \|\| ferror(fp)) {
	fprintf(stderr, "%s: fread, size %#x, n %#x\n", __func__, size, n);
	perror("fread()");
	free(buf);
	fclose(fp);
	return 1;
	}
	err = write(fd, buf, size);
	if (err < 0) {
	fprintf(stderr, "%s: write, size %#x, n %#x\n", __func__, size, n);
	perror("write()");
	free(buf);
	fclose(fp);
	return 1;
	}
	n -= size;
	} while (n > 0);

	if (buf != NULL)
	free(buf);
	fclose(fp);
	printf("Copied %d bytes from %s to address 0x%.8"PRIxoff_t" in flash\n", len, filename, offset);
	return 0;
	}

	int showinfo(int fd)
	{
	int i, err, n;
	struct mtd_info_user mtd;
	static struct region_info_user region[1024];

	err = getmeminfo(fd, &mtd);
	if (err < 0) {
	perror("MEMGETINFO");
	return 1;
	}

	err = getregions(fd, region, &n);
	if (err < 0) {
	perror("MEMGETREGIONCOUNT");
	return 1;
	}

	printf("mtd.type = ");
	switch (mtd.type) {
	case MTD_ABSENT:
	printf("MTD_ABSENT");
	break;
	case MTD_RAM:
	printf("MTD_RAM");
	break;
	case MTD_ROM:
	printf("MTD_ROM");
	break;
	case MTD_NORFLASH:
	printf("MTD_NORFLASH");
	break;
	case MTD_NANDFLASH:
	printf("MTD_NANDFLASH");
	break;
	case MTD_MLCNANDFLASH:
	printf("MTD_MLCNANDFLASH");
	break;
	case MTD_DATAFLASH:
	printf("MTD_DATAFLASH");
	break;
	case MTD_UBIVOLUME:
	printf("MTD_UBIVOLUME");
	default:
	printf("(unknown type - new MTD API maybe?)");
	}

	printf("\nmtd.flags = ");
	if (mtd.flags == MTD_CAP_ROM)
	printf("MTD_CAP_ROM");
	else if (mtd.flags == MTD_CAP_RAM)
	printf("MTD_CAP_RAM");
	else if (mtd.flags == MTD_CAP_NORFLASH)
	printf("MTD_CAP_NORFLASH");
	else if (mtd.flags == MTD_CAP_NANDFLASH)
	printf("MTD_CAP_NANDFLASH");
	else if (mtd.flags == MTD_WRITEABLE)
	printf("MTD_WRITEABLE");
	else {
	int first = 1;
	static struct {
	const char *name;
	int value;
	} flags[] =
	{
	{ "MTD_WRITEABLE", MTD_WRITEABLE },
	{ "MTD_BIT_WRITEABLE", MTD_BIT_WRITEABLE },
	{ "MTD_NO_ERASE", MTD_NO_ERASE },
	{ "MTD_POWERUP_LOCK", MTD_POWERUP_LOCK },
	{ NULL, -1 }
	};
	for (i = 0; flags[i].name != NULL; i++) {
	if (mtd.flags & flags[i].value) {
	if (first) {
	printf("%s", flags[i].name);
	first = 0;
	} else {
	printf(" \| %s", flags[i].name);
	}
	}
	}
	}

	printf("\nmtd.size = ");
	printsize(mtd.size);

	printf("\nmtd.erasesize = ");
	printsize(mtd.erasesize);

	printf("\nmtd.writesize = ");
	printsize(mtd.writesize);

	printf("\nmtd.oobsize = ");
	printsize(mtd.oobsize);

	printf("\nregions = %d\n\n", n);

	for (i = 0; i < n; i++) {
	printf("region[%d].offset = 0x%.8x\n"
	"region[%d].erasesize = ",
	i, region[i].offset, i);
	printsize(region[i].erasesize);
	printf("\nregion[%d].numblocks = %d\n"
	"region[%d].regionindex = %d\n",
	i, region[i].numblocks,
	i, region[i].regionindex);
	}
	return 0;
	}

	void showusage(void)
	{
	fprintf(stderr, "usage: %1$s info <device>\n"
	" %1$s read <device> <offset> <len> <dest-filename>\n"
	" %1$s write <device> <offset> <len> <source-filename>\n"
	" %1$s erase <device> <offset> <len>\n",
	PROGRAM_NAME);
	exit(EXIT_FAILURE);
	}

	int main(int argc, char *argv[])
	{
	int err = 0, fd;
	int open_flag;

	enum {
	OPT_INFO,
	OPT_READ,
	OPT_WRITE,
	OPT_ERASE
	} option = OPT_INFO;

	/* parse command-line options */
	if (argc == 3 && !strcmp(argv[1], "info"))
	option = OPT_INFO;
	else if (argc == 6 && !strcmp(argv[1], "read"))
	option = OPT_READ;
	else if (argc == 6 && !strcmp(argv[1], "write"))
	option = OPT_WRITE;
	else if (argc == 5 && !strcmp(argv[1], "erase"))
	option = OPT_ERASE;
	else
	showusage();

	/* open device */
	open_flag = (option == OPT_INFO \|\| option == OPT_READ) ? O_RDONLY : O_RDWR;
	if ((fd = open(argv[2], O_SYNC \| open_flag)) < 0)
	errmsg_die("open()");

	switch (option) {
	case OPT_INFO:
	showinfo(fd);
	break;
	case OPT_READ:
	err = flash_to_file(fd, strtoll(argv[3], NULL, 0), strtoul(argv[4], NULL, 0), argv[5]);
	break;
	case OPT_WRITE:
	err = file_to_flash(fd, strtoll(argv[3], NULL, 0), strtoul(argv[4], NULL, 0), argv[5]);
	break;
	case OPT_ERASE:
	err = erase_flash(fd, strtoul(argv[3], NULL, 0), strtoul(argv[4], NULL, 0));
	break;
	}

	/* close device */
	if (close(fd) < 0)
	errmsg_die("close()");

	return err;
	}