/* * Copyright (C) 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 <stdio.h> #include <stdlib.h> #include <mtd/mtd-user.h> #include <string.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <stdint.h> #include <stdlib.h> #include "mtd_probe.h" static const uint8_t cis_signature[] = { 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20 }; void probe_smart_media(int mtd_fd, mtd_info_t* info) { int sector_size; int block_size; int size_in_megs; int spare_count; char* cis_buffer = malloc(SM_SECTOR_SIZE); int offset; int cis_found = 0; if (!cis_buffer) return; if (info->type != MTD_NANDFLASH) goto exit; sector_size = info->writesize; block_size = info->erasesize; size_in_megs = info->size / (1024 * 1024); if (sector_size != SM_SECTOR_SIZE && sector_size != SM_SMALL_PAGE) goto exit; 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) { 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) goto exit; if (memcmp(cis_buffer, cis_signature, sizeof(cis_signature)) != 0 && (memcmp(cis_buffer + SM_SMALL_PAGE, cis_signature, sizeof(cis_signature)) != 0)) goto exit; printf("MTD_FTL=smartmedia\n"); free(cis_buffer); exit(0); exit: free(cis_buffer); return; }