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https://github.com/systemd/systemd.git
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100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
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/*
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* probe_smartmedia.c
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* This file is part of mtd_probe
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*
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* Copyright (C) 2010 - Maxim Levitsky
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*
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* mtd_probe is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mtd_probe 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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* You should have received a copy of the GNU General Public License
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* along with mtd_probe; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <mtd/mtd-user.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "mtd_probe.h"
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static const uint8_t cis_signature[] = {
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0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
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};
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void probe_smart_media(int mtd_fd, mtd_info_t* info) {
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char* cis_buffer = malloc(SM_SECTOR_SIZE);
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if (!cis_buffer)
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return;
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if (info->type != MTD_NANDFLASH)
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goto exit;
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int sector_size = info->writesize;
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int block_size = info->erasesize;
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int size_in_megs = info->size / (1024 * 1024);
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int spare_count;
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if (sector_size != SM_SECTOR_SIZE && sector_size != SM_SMALL_PAGE)
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goto exit;
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switch(size_in_megs) {
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case 1:
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case 2:
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spare_count = 6;
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break;
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case 4:
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spare_count = 12;
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break;
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default:
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spare_count = 24;
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break;
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}
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int offset;
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int cis_found = 0;
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for (offset = 0 ; offset < block_size * spare_count ;
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offset += sector_size) {
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lseek(mtd_fd, SEEK_SET, offset);
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if (read(mtd_fd, cis_buffer, SM_SECTOR_SIZE) == SM_SECTOR_SIZE){
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cis_found = 1;
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break;
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}
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}
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if (!cis_found)
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goto exit;
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if (memcmp(cis_buffer, cis_signature, sizeof(cis_signature)) != 0 &&
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(memcmp(cis_buffer + SM_SMALL_PAGE, cis_signature,
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sizeof(cis_signature)) != 0))
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goto exit;
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printf("MTD_FTL=smartmedia\n");
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free(cis_buffer);
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exit(0);
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exit:
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free(cis_buffer);
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return;
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}
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