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95 lines
2.0 KiB
C
95 lines
2.0 KiB
C
/*
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* TP-Link recovery flag set and unset code for ramips target
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*
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* Copyright (C) 2018 David Bauer <mail@david-bauer.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License v2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <stdint.h>
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#include <mtd/mtd-user.h>
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#include <sys/ioctl.h>
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#include "mtd.h"
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#define TPL_RECOVER_MAGIC 0x89abcdef
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#define TPL_NO_RECOVER_MAGIC 0x00000000
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struct uboot_args {
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uint32_t magic;
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};
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int mtd_tpl_recoverflag_write(const char *mtd, const bool recovery_active)
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{
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struct erase_info_user erase_info;
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struct uboot_args *args;
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uint32_t magic;
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int ret = 0;
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int fd;
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args = malloc(erasesize);
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if (!args) {
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fprintf(stderr, "Could not allocate memory!\n");
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return -1;
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}
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fd = mtd_check_open(mtd);
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if (fd < 0) {
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fprintf(stderr, "Could not open mtd device: %s\n", mtd);
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ret = -1;
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goto out;
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}
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/* read first block (containing the magic) */
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pread(fd, args, erasesize, 0);
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/* set magic to desired value */
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magic = TPL_RECOVER_MAGIC;
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if (!recovery_active)
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magic = TPL_NO_RECOVER_MAGIC;
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/* no need to write when magic is already set correctly */
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if (magic == args->magic)
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goto out;
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/* erase first block (containing the magic) */
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erase_info.start = 0;
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erase_info.length = erasesize;
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ret = ioctl(fd, MEMERASE, &erase_info);
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if (ret < 0) {
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fprintf(stderr, "failed to erase block: %i\n", ret);
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goto out;
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}
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/* write magic to flash */
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args->magic = magic;
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ret = pwrite(fd, args, erasesize, 0);
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if (ret < 0)
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fprintf(stderr, "failed to write: %i\n", ret);
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sync();
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out:
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free(args);
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close(fd);
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return ret;
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}
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