91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
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/*
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* flash_{lock,unlock}
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*
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* utilities for locking/unlocking sectors of flash devices
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*/
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#ifndef PROGRAM_NAME
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#define PROGRAM_NAME "flash_unlock"
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#define FLASH_MSG "unlock"
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#define FLASH_UNLOCK 1
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#else
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#define FLASH_MSG "lock"
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#define FLASH_UNLOCK 0
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#endif
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <time.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <string.h>
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#include "common.h"
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#include <mtd/mtd-user.h>
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static void usage(int status)
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{
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fprintf(status ? stderr : stdout,
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"Usage: %s <mtd device> [offset] [block count]\n\n"
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"If offset is not specified, it defaults to 0.\n"
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"If block count is not specified, it defaults to all blocks.\n",
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PROGRAM_NAME);
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exit(status);
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}
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int main(int argc, char *argv[])
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{
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int fd, request;
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struct mtd_info_user mtdInfo;
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struct erase_info_user mtdLockInfo;
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int count;
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const char *dev;
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/* Parse command line options */
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if (argc < 2 || argc > 4)
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usage(1);
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if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))
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usage(0);
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dev = argv[1];
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/* Get the device info to compare to command line sizes */
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fd = open(dev, O_RDWR);
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if (fd < 0)
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sys_errmsg_die("could not open: %s", dev);
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if (ioctl(fd, MEMGETINFO, &mtdInfo))
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sys_errmsg_die("could not get mtd info: %s", dev);
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/* Make sure user options are valid */
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if (argc > 2)
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mtdLockInfo.start = strtol(argv[2], NULL, 0);
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else
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mtdLockInfo.start = 0;
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if (mtdLockInfo.start > mtdInfo.size)
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errmsg_die("%#x is beyond device size %#x",
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mtdLockInfo.start, mtdInfo.size);
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if (argc > 3) {
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count = strtol(argv[3], NULL, 0);
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if (count == -1)
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mtdLockInfo.length = mtdInfo.size;
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else
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mtdLockInfo.length = mtdInfo.erasesize * count;
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} else
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mtdLockInfo.length = mtdInfo.size;
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if (mtdLockInfo.start + mtdLockInfo.length > mtdInfo.size)
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errmsg_die("range is more than device supports: %#x + %#x > %#x",
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mtdLockInfo.start, mtdLockInfo.length, mtdInfo.size);
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/* Finally do the operation */
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request = FLASH_UNLOCK ? MEMUNLOCK : MEMLOCK;
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if (ioctl(fd, request, &mtdLockInfo))
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sys_errmsg_die("could not %s device: %s\n",
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FLASH_MSG, dev);
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return 0;
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}
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