mtd-utils-1.3.1/flash_lock.c

/*
 * FILE flash_lock.c
 *
 * This utility locks one or more sectors of flash device.
 *
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <string.h>

#include <mtd/mtd-user.h>

int main(int argc, char *argv[])
{
	int fd;
	struct mtd_info_user mtdInfo;
	struct erase_info_user mtdLockInfo;
	int num_sectors;
	int ofs;

	/*
	 * Parse command line options
	 */
	if(argc != 4)
	{
		fprintf(stderr, "USAGE: %s <mtd device> <ofs in hex> <num of sectors in decimal or -1 for all sectors>\n", argv[0]);
		exit(1);
	}
	else if(strncmp(argv[1], "/dev/mtd", 8) != 0)
	{
		fprintf(stderr, "'%s' is not a MTD device.  Must specify mtd device: /dev/mtd?\n", argv[1]);
		exit(1);
	}

	fd = open(argv[1], O_RDWR);
	if(fd < 0)
	{
		fprintf(stderr, "Could not open mtd device: %s\n", argv[1]);
		exit(1);
	}

	if(ioctl(fd, MEMGETINFO, &mtdInfo))
	{
		fprintf(stderr, "Could not get MTD device info from %s\n", argv[1]);
		close(fd);
		exit(1);
	}
	sscanf(argv[2], "%x",&ofs);
	sscanf(argv[3], "%d",&num_sectors);
	if(ofs > mtdInfo.size - mtdInfo.erasesize)
	{
		fprintf(stderr, "%x is beyond device size %x\n",ofs,(unsigned int)(mtdInfo.size - mtdInfo.erasesize));
		exit(1);
	}

	if (num_sectors == -1) {
		num_sectors = mtdInfo.size/mtdInfo.erasesize;
	}
	else {
		if(num_sectors > mtdInfo.size/mtdInfo.erasesize)
		{
			fprintf(stderr, "%d are too many sectors, device only has %d\n",num_sectors,(int)(mtdInfo.size/mtdInfo.erasesize));
			exit(1);
		}
	}

	mtdLockInfo.start = ofs;
	mtdLockInfo.length = (num_sectors - 1) * mtdInfo.erasesize;
	if(ioctl(fd, MEMLOCK, &mtdLockInfo))
	{
		fprintf(stderr, "Could not lock MTD device: %s\n", argv[1]);
		close(fd);
		exit(1);
	}

	return 0;
}