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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright © 2010 - Maxim Levitsky
*
* mtd_probe 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.
*
* mtd_probe 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 mtd_probe; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#include <errno.h>
#include <fcntl.h>
#include <mtd/mtd-user.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "alloc-util.h"
#include "mtd_probe.h"
static const uint8_t cis_signature[] = {
0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
};
int probe_smart_media(int mtd_fd, mtd_info_t* info) {
int sector_size;
int block_size;
int size_in_megs;
int spare_count;
_cleanup_free_ uint8_t *cis_buffer = NULL;
int offset;
int cis_found = 0;
cis_buffer = malloc(SM_SECTOR_SIZE);
if (!cis_buffer)
return log_oom();
if (info->type != MTD_NANDFLASH)
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
"Not marked MTD_NANDFLASH.");
sector_size = info->writesize;
block_size = info->erasesize;
size_in_megs = info->size / (1024 * 1024);
if (!IN_SET(sector_size, SM_SECTOR_SIZE, SM_SMALL_PAGE))
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
"Unexpected sector size: %i", sector_size);
switch(size_in_megs) {
case 1:
case 2:
spare_count = 6;
break;
case 4:
spare_count = 12;
break;
default:
spare_count = 24;
break;
}
for (offset = 0; offset < block_size * spare_count; offset += sector_size) {
(void) lseek(mtd_fd, SEEK_SET, offset);
if (read(mtd_fd, cis_buffer, SM_SECTOR_SIZE) == SM_SECTOR_SIZE) {
cis_found = 1;
break;
}
}
if (!cis_found)
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
"CIS not found");
if (memcmp(cis_buffer, cis_signature, sizeof(cis_signature)) != 0 &&
memcmp(cis_buffer + SM_SMALL_PAGE, cis_signature, sizeof(cis_signature)) != 0)
return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
"CIS signature didn't match");
printf("MTD_FTL=smartmedia\n");
return 0;
}
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