159829cc1SJean-Christophe PLAGNIOL-VILLARD /* 259829cc1SJean-Christophe PLAGNIOL-VILLARD * linux/drivers/mtd/onenand/onenand_bbt.c 359829cc1SJean-Christophe PLAGNIOL-VILLARD * 459829cc1SJean-Christophe PLAGNIOL-VILLARD * Bad Block Table support for the OneNAND driver 559829cc1SJean-Christophe PLAGNIOL-VILLARD * 6ef0921d6SKyungmin Park * Copyright(c) 2005-2008 Samsung Electronics 759829cc1SJean-Christophe PLAGNIOL-VILLARD * Kyungmin Park <kyungmin.park@samsung.com> 859829cc1SJean-Christophe PLAGNIOL-VILLARD * 959829cc1SJean-Christophe PLAGNIOL-VILLARD * TODO: 1059829cc1SJean-Christophe PLAGNIOL-VILLARD * Split BBT core and chip specific BBT. 1159829cc1SJean-Christophe PLAGNIOL-VILLARD * 1259829cc1SJean-Christophe PLAGNIOL-VILLARD * This program is free software; you can redistribute it and/or modify 1359829cc1SJean-Christophe PLAGNIOL-VILLARD * it under the terms of the GNU General Public License version 2 as 1459829cc1SJean-Christophe PLAGNIOL-VILLARD * published by the Free Software Foundation. 1559829cc1SJean-Christophe PLAGNIOL-VILLARD */ 1659829cc1SJean-Christophe PLAGNIOL-VILLARD 1759829cc1SJean-Christophe PLAGNIOL-VILLARD #include <common.h> 187b15e2bbSMike Frysinger #include <linux/compat.h> 1959829cc1SJean-Christophe PLAGNIOL-VILLARD #include <linux/mtd/mtd.h> 2059829cc1SJean-Christophe PLAGNIOL-VILLARD #include <linux/mtd/onenand.h> 2159829cc1SJean-Christophe PLAGNIOL-VILLARD #include <malloc.h> 2259829cc1SJean-Christophe PLAGNIOL-VILLARD 23*1221ce45SMasahiro Yamada #include <linux/errno.h> 2459829cc1SJean-Christophe PLAGNIOL-VILLARD 2559829cc1SJean-Christophe PLAGNIOL-VILLARD /** 2659829cc1SJean-Christophe PLAGNIOL-VILLARD * check_short_pattern - [GENERIC] check if a pattern is in the buffer 2759829cc1SJean-Christophe PLAGNIOL-VILLARD * @param buf the buffer to search 2859829cc1SJean-Christophe PLAGNIOL-VILLARD * @param len the length of buffer to search 2959829cc1SJean-Christophe PLAGNIOL-VILLARD * @param paglen the pagelength 3059829cc1SJean-Christophe PLAGNIOL-VILLARD * @param td search pattern descriptor 3159829cc1SJean-Christophe PLAGNIOL-VILLARD * 3259829cc1SJean-Christophe PLAGNIOL-VILLARD * Check for a pattern at the given place. Used to search bad block 3359829cc1SJean-Christophe PLAGNIOL-VILLARD * tables and good / bad block identifiers. Same as check_pattern, but 3459829cc1SJean-Christophe PLAGNIOL-VILLARD * no optional empty check and the pattern is expected to start 3559829cc1SJean-Christophe PLAGNIOL-VILLARD * at offset 0. 3659829cc1SJean-Christophe PLAGNIOL-VILLARD */ 3759829cc1SJean-Christophe PLAGNIOL-VILLARD static int check_short_pattern(uint8_t * buf, int len, int paglen, 3859829cc1SJean-Christophe PLAGNIOL-VILLARD struct nand_bbt_descr *td) 3959829cc1SJean-Christophe PLAGNIOL-VILLARD { 4059829cc1SJean-Christophe PLAGNIOL-VILLARD int i; 4159829cc1SJean-Christophe PLAGNIOL-VILLARD uint8_t *p = buf; 4259829cc1SJean-Christophe PLAGNIOL-VILLARD 4359829cc1SJean-Christophe PLAGNIOL-VILLARD /* Compare the pattern */ 4459829cc1SJean-Christophe PLAGNIOL-VILLARD for (i = 0; i < td->len; i++) { 4559829cc1SJean-Christophe PLAGNIOL-VILLARD if (p[i] != td->pattern[i]) 4659829cc1SJean-Christophe PLAGNIOL-VILLARD return -1; 4759829cc1SJean-Christophe PLAGNIOL-VILLARD } 4859829cc1SJean-Christophe PLAGNIOL-VILLARD return 0; 4959829cc1SJean-Christophe PLAGNIOL-VILLARD } 5059829cc1SJean-Christophe PLAGNIOL-VILLARD 5159829cc1SJean-Christophe PLAGNIOL-VILLARD /** 5259829cc1SJean-Christophe PLAGNIOL-VILLARD * create_bbt - [GENERIC] Create a bad block table by scanning the device 5359829cc1SJean-Christophe PLAGNIOL-VILLARD * @param mtd MTD device structure 5459829cc1SJean-Christophe PLAGNIOL-VILLARD * @param buf temporary buffer 5559829cc1SJean-Christophe PLAGNIOL-VILLARD * @param bd descriptor for the good/bad block search pattern 5659829cc1SJean-Christophe PLAGNIOL-VILLARD * @param chip create the table for a specific chip, -1 read all chips. 5759829cc1SJean-Christophe PLAGNIOL-VILLARD * Applies only if NAND_BBT_PERCHIP option is set 5859829cc1SJean-Christophe PLAGNIOL-VILLARD * 5959829cc1SJean-Christophe PLAGNIOL-VILLARD * Create a bad block table by scanning the device 6059829cc1SJean-Christophe PLAGNIOL-VILLARD * for the given good/bad block identify pattern 6159829cc1SJean-Christophe PLAGNIOL-VILLARD */ 6259829cc1SJean-Christophe PLAGNIOL-VILLARD static int create_bbt(struct mtd_info *mtd, uint8_t * buf, 6359829cc1SJean-Christophe PLAGNIOL-VILLARD struct nand_bbt_descr *bd, int chip) 6459829cc1SJean-Christophe PLAGNIOL-VILLARD { 6559829cc1SJean-Christophe PLAGNIOL-VILLARD struct onenand_chip *this = mtd->priv; 6659829cc1SJean-Christophe PLAGNIOL-VILLARD struct bbm_info *bbm = this->bbm; 6759829cc1SJean-Christophe PLAGNIOL-VILLARD int i, j, numblocks, len, scanlen; 6859829cc1SJean-Christophe PLAGNIOL-VILLARD int startblock; 6959829cc1SJean-Christophe PLAGNIOL-VILLARD loff_t from; 7059829cc1SJean-Christophe PLAGNIOL-VILLARD size_t readlen, ooblen; 71bfd7f386SKyungmin Park struct mtd_oob_ops ops; 72cacbe919SAmul Kumar Saha int rgn; 7359829cc1SJean-Christophe PLAGNIOL-VILLARD 7459829cc1SJean-Christophe PLAGNIOL-VILLARD printk(KERN_INFO "Scanning device for bad blocks\n"); 7559829cc1SJean-Christophe PLAGNIOL-VILLARD 7659829cc1SJean-Christophe PLAGNIOL-VILLARD len = 1; 7759829cc1SJean-Christophe PLAGNIOL-VILLARD 7859829cc1SJean-Christophe PLAGNIOL-VILLARD /* We need only read few bytes from the OOB area */ 7959829cc1SJean-Christophe PLAGNIOL-VILLARD scanlen = ooblen = 0; 8059829cc1SJean-Christophe PLAGNIOL-VILLARD readlen = bd->len; 8159829cc1SJean-Christophe PLAGNIOL-VILLARD 8259829cc1SJean-Christophe PLAGNIOL-VILLARD /* chip == -1 case only */ 8359829cc1SJean-Christophe PLAGNIOL-VILLARD /* Note that numblocks is 2 * (real numblocks) here; 8459829cc1SJean-Christophe PLAGNIOL-VILLARD * see i += 2 below as it makses shifting and masking less painful 8559829cc1SJean-Christophe PLAGNIOL-VILLARD */ 86cacbe919SAmul Kumar Saha numblocks = this->chipsize >> (bbm->bbt_erase_shift - 1); 8759829cc1SJean-Christophe PLAGNIOL-VILLARD startblock = 0; 8859829cc1SJean-Christophe PLAGNIOL-VILLARD from = 0; 8959829cc1SJean-Christophe PLAGNIOL-VILLARD 90dfe64e2cSSergey Lapin ops.mode = MTD_OPS_PLACE_OOB; 91bfd7f386SKyungmin Park ops.ooblen = readlen; 92bfd7f386SKyungmin Park ops.oobbuf = buf; 93bfd7f386SKyungmin Park ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0; 94bfd7f386SKyungmin Park 9559829cc1SJean-Christophe PLAGNIOL-VILLARD for (i = startblock; i < numblocks;) { 9659829cc1SJean-Christophe PLAGNIOL-VILLARD int ret; 9759829cc1SJean-Christophe PLAGNIOL-VILLARD 9859829cc1SJean-Christophe PLAGNIOL-VILLARD for (j = 0; j < len; j++) { 9959829cc1SJean-Christophe PLAGNIOL-VILLARD /* No need to read pages fully, 10059829cc1SJean-Christophe PLAGNIOL-VILLARD * just read required OOB bytes */ 101bfd7f386SKyungmin Park ret = onenand_bbt_read_oob(mtd, 102d438d508SKyungmin Park from + j * mtd->writesize + 103bfd7f386SKyungmin Park bd->offs, &ops); 10459829cc1SJean-Christophe PLAGNIOL-VILLARD 105bfd7f386SKyungmin Park /* If it is a initial bad block, just ignore it */ 106bfd7f386SKyungmin Park if (ret == ONENAND_BBT_READ_FATAL_ERROR) 107bfd7f386SKyungmin Park return -EIO; 10859829cc1SJean-Christophe PLAGNIOL-VILLARD 109bfd7f386SKyungmin Park if (ret || check_short_pattern 110d438d508SKyungmin Park (&buf[j * scanlen], scanlen, mtd->writesize, bd)) { 11159829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->bbt[i >> 3] |= 0x03 << (i & 0x6); 11259829cc1SJean-Christophe PLAGNIOL-VILLARD printk(KERN_WARNING 11359829cc1SJean-Christophe PLAGNIOL-VILLARD "Bad eraseblock %d at 0x%08x\n", i >> 1, 11459829cc1SJean-Christophe PLAGNIOL-VILLARD (unsigned int)from); 11559829cc1SJean-Christophe PLAGNIOL-VILLARD break; 11659829cc1SJean-Christophe PLAGNIOL-VILLARD } 11759829cc1SJean-Christophe PLAGNIOL-VILLARD } 11859829cc1SJean-Christophe PLAGNIOL-VILLARD i += 2; 119cacbe919SAmul Kumar Saha 120cacbe919SAmul Kumar Saha if (FLEXONENAND(this)) { 121cacbe919SAmul Kumar Saha rgn = flexonenand_region(mtd, from); 122cacbe919SAmul Kumar Saha from += mtd->eraseregions[rgn].erasesize; 123cacbe919SAmul Kumar Saha } else 12459829cc1SJean-Christophe PLAGNIOL-VILLARD from += (1 << bbm->bbt_erase_shift); 12559829cc1SJean-Christophe PLAGNIOL-VILLARD } 12659829cc1SJean-Christophe PLAGNIOL-VILLARD 12759829cc1SJean-Christophe PLAGNIOL-VILLARD return 0; 12859829cc1SJean-Christophe PLAGNIOL-VILLARD } 12959829cc1SJean-Christophe PLAGNIOL-VILLARD 13059829cc1SJean-Christophe PLAGNIOL-VILLARD /** 13159829cc1SJean-Christophe PLAGNIOL-VILLARD * onenand_memory_bbt - [GENERIC] create a memory based bad block table 13259829cc1SJean-Christophe PLAGNIOL-VILLARD * @param mtd MTD device structure 13359829cc1SJean-Christophe PLAGNIOL-VILLARD * @param bd descriptor for the good/bad block search pattern 13459829cc1SJean-Christophe PLAGNIOL-VILLARD * 13559829cc1SJean-Christophe PLAGNIOL-VILLARD * The function creates a memory based bbt by scanning the device 13659829cc1SJean-Christophe PLAGNIOL-VILLARD * for manufacturer / software marked good / bad blocks 13759829cc1SJean-Christophe PLAGNIOL-VILLARD */ 13859829cc1SJean-Christophe PLAGNIOL-VILLARD static inline int onenand_memory_bbt(struct mtd_info *mtd, 13959829cc1SJean-Christophe PLAGNIOL-VILLARD struct nand_bbt_descr *bd) 14059829cc1SJean-Christophe PLAGNIOL-VILLARD { 14159829cc1SJean-Christophe PLAGNIOL-VILLARD unsigned char data_buf[MAX_ONENAND_PAGESIZE]; 14259829cc1SJean-Christophe PLAGNIOL-VILLARD 14359829cc1SJean-Christophe PLAGNIOL-VILLARD return create_bbt(mtd, data_buf, bd, -1); 14459829cc1SJean-Christophe PLAGNIOL-VILLARD } 14559829cc1SJean-Christophe PLAGNIOL-VILLARD 14659829cc1SJean-Christophe PLAGNIOL-VILLARD /** 14759829cc1SJean-Christophe PLAGNIOL-VILLARD * onenand_isbad_bbt - [OneNAND Interface] Check if a block is bad 14859829cc1SJean-Christophe PLAGNIOL-VILLARD * @param mtd MTD device structure 14959829cc1SJean-Christophe PLAGNIOL-VILLARD * @param offs offset in the device 15059829cc1SJean-Christophe PLAGNIOL-VILLARD * @param allowbbt allow access to bad block table region 15159829cc1SJean-Christophe PLAGNIOL-VILLARD */ 15259829cc1SJean-Christophe PLAGNIOL-VILLARD static int onenand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) 15359829cc1SJean-Christophe PLAGNIOL-VILLARD { 15459829cc1SJean-Christophe PLAGNIOL-VILLARD struct onenand_chip *this = mtd->priv; 15559829cc1SJean-Christophe PLAGNIOL-VILLARD struct bbm_info *bbm = this->bbm; 15659829cc1SJean-Christophe PLAGNIOL-VILLARD int block; 15759829cc1SJean-Christophe PLAGNIOL-VILLARD uint8_t res; 15859829cc1SJean-Christophe PLAGNIOL-VILLARD 15959829cc1SJean-Christophe PLAGNIOL-VILLARD /* Get block number * 2 */ 160cacbe919SAmul Kumar Saha block = (int) (onenand_block(this, offs) << 1); 16159829cc1SJean-Christophe PLAGNIOL-VILLARD res = (bbm->bbt[block >> 3] >> (block & 0x06)) & 0x03; 16259829cc1SJean-Christophe PLAGNIOL-VILLARD 1633167c538SScott Wood MTDDEBUG (MTD_DEBUG_LEVEL2, 16459829cc1SJean-Christophe PLAGNIOL-VILLARD "onenand_isbad_bbt: bbt info for offs 0x%08x: (block %d) 0x%02x\n", 16559829cc1SJean-Christophe PLAGNIOL-VILLARD (unsigned int)offs, block >> 1, res); 16659829cc1SJean-Christophe PLAGNIOL-VILLARD 16759829cc1SJean-Christophe PLAGNIOL-VILLARD switch ((int)res) { 16859829cc1SJean-Christophe PLAGNIOL-VILLARD case 0x00: 16959829cc1SJean-Christophe PLAGNIOL-VILLARD return 0; 17059829cc1SJean-Christophe PLAGNIOL-VILLARD case 0x01: 17159829cc1SJean-Christophe PLAGNIOL-VILLARD return 1; 17259829cc1SJean-Christophe PLAGNIOL-VILLARD case 0x02: 17359829cc1SJean-Christophe PLAGNIOL-VILLARD return allowbbt ? 0 : 1; 17459829cc1SJean-Christophe PLAGNIOL-VILLARD } 17559829cc1SJean-Christophe PLAGNIOL-VILLARD 17659829cc1SJean-Christophe PLAGNIOL-VILLARD return 1; 17759829cc1SJean-Christophe PLAGNIOL-VILLARD } 17859829cc1SJean-Christophe PLAGNIOL-VILLARD 17959829cc1SJean-Christophe PLAGNIOL-VILLARD /** 18059829cc1SJean-Christophe PLAGNIOL-VILLARD * onenand_scan_bbt - [OneNAND Interface] scan, find, read and maybe create bad block table(s) 18159829cc1SJean-Christophe PLAGNIOL-VILLARD * @param mtd MTD device structure 18259829cc1SJean-Christophe PLAGNIOL-VILLARD * @param bd descriptor for the good/bad block search pattern 18359829cc1SJean-Christophe PLAGNIOL-VILLARD * 18459829cc1SJean-Christophe PLAGNIOL-VILLARD * The function checks, if a bad block table(s) is/are already 18559829cc1SJean-Christophe PLAGNIOL-VILLARD * available. If not it scans the device for manufacturer 18659829cc1SJean-Christophe PLAGNIOL-VILLARD * marked good / bad blocks and writes the bad block table(s) to 18759829cc1SJean-Christophe PLAGNIOL-VILLARD * the selected place. 18859829cc1SJean-Christophe PLAGNIOL-VILLARD * 18959829cc1SJean-Christophe PLAGNIOL-VILLARD * The bad block table memory is allocated here. It must be freed 19059829cc1SJean-Christophe PLAGNIOL-VILLARD * by calling the onenand_free_bbt function. 19159829cc1SJean-Christophe PLAGNIOL-VILLARD * 19259829cc1SJean-Christophe PLAGNIOL-VILLARD */ 19359829cc1SJean-Christophe PLAGNIOL-VILLARD int onenand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) 19459829cc1SJean-Christophe PLAGNIOL-VILLARD { 19559829cc1SJean-Christophe PLAGNIOL-VILLARD struct onenand_chip *this = mtd->priv; 19659829cc1SJean-Christophe PLAGNIOL-VILLARD struct bbm_info *bbm = this->bbm; 19759829cc1SJean-Christophe PLAGNIOL-VILLARD int len, ret = 0; 19859829cc1SJean-Christophe PLAGNIOL-VILLARD 199cacbe919SAmul Kumar Saha len = this->chipsize >> (this->erase_shift + 2); 20059829cc1SJean-Christophe PLAGNIOL-VILLARD /* Allocate memory (2bit per block) */ 20159829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->bbt = malloc(len); 202dfe64e2cSSergey Lapin if (!bbm->bbt) 20359829cc1SJean-Christophe PLAGNIOL-VILLARD return -ENOMEM; 20459829cc1SJean-Christophe PLAGNIOL-VILLARD /* Clear the memory bad block table */ 20559829cc1SJean-Christophe PLAGNIOL-VILLARD memset(bbm->bbt, 0x00, len); 20659829cc1SJean-Christophe PLAGNIOL-VILLARD 20759829cc1SJean-Christophe PLAGNIOL-VILLARD /* Set the bad block position */ 20859829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->badblockpos = ONENAND_BADBLOCK_POS; 20959829cc1SJean-Christophe PLAGNIOL-VILLARD 21059829cc1SJean-Christophe PLAGNIOL-VILLARD /* Set erase shift */ 21159829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->bbt_erase_shift = this->erase_shift; 21259829cc1SJean-Christophe PLAGNIOL-VILLARD 21359829cc1SJean-Christophe PLAGNIOL-VILLARD if (!bbm->isbad_bbt) 21459829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->isbad_bbt = onenand_isbad_bbt; 21559829cc1SJean-Christophe PLAGNIOL-VILLARD 21659829cc1SJean-Christophe PLAGNIOL-VILLARD /* Scan the device to build a memory based bad block table */ 21759829cc1SJean-Christophe PLAGNIOL-VILLARD if ((ret = onenand_memory_bbt(mtd, bd))) { 21859829cc1SJean-Christophe PLAGNIOL-VILLARD printk(KERN_ERR 21959829cc1SJean-Christophe PLAGNIOL-VILLARD "onenand_scan_bbt: Can't scan flash and build the RAM-based BBT\n"); 22059829cc1SJean-Christophe PLAGNIOL-VILLARD free(bbm->bbt); 22159829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->bbt = NULL; 22259829cc1SJean-Christophe PLAGNIOL-VILLARD } 22359829cc1SJean-Christophe PLAGNIOL-VILLARD 22459829cc1SJean-Christophe PLAGNIOL-VILLARD return ret; 22559829cc1SJean-Christophe PLAGNIOL-VILLARD } 22659829cc1SJean-Christophe PLAGNIOL-VILLARD 22759829cc1SJean-Christophe PLAGNIOL-VILLARD /* 22859829cc1SJean-Christophe PLAGNIOL-VILLARD * Define some generic bad / good block scan pattern which are used 22959829cc1SJean-Christophe PLAGNIOL-VILLARD * while scanning a device for factory marked good / bad blocks. 23059829cc1SJean-Christophe PLAGNIOL-VILLARD */ 23159829cc1SJean-Christophe PLAGNIOL-VILLARD static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; 23259829cc1SJean-Christophe PLAGNIOL-VILLARD 23359829cc1SJean-Christophe PLAGNIOL-VILLARD static struct nand_bbt_descr largepage_memorybased = { 23459829cc1SJean-Christophe PLAGNIOL-VILLARD .options = 0, 23559829cc1SJean-Christophe PLAGNIOL-VILLARD .offs = 0, 23659829cc1SJean-Christophe PLAGNIOL-VILLARD .len = 2, 23759829cc1SJean-Christophe PLAGNIOL-VILLARD .pattern = scan_ff_pattern, 23859829cc1SJean-Christophe PLAGNIOL-VILLARD }; 23959829cc1SJean-Christophe PLAGNIOL-VILLARD 24059829cc1SJean-Christophe PLAGNIOL-VILLARD /** 24159829cc1SJean-Christophe PLAGNIOL-VILLARD * onenand_default_bbt - [OneNAND Interface] Select a default bad block table for the device 24259829cc1SJean-Christophe PLAGNIOL-VILLARD * @param mtd MTD device structure 24359829cc1SJean-Christophe PLAGNIOL-VILLARD * 24459829cc1SJean-Christophe PLAGNIOL-VILLARD * This function selects the default bad block table 24559829cc1SJean-Christophe PLAGNIOL-VILLARD * support for the device and calls the onenand_scan_bbt function 24659829cc1SJean-Christophe PLAGNIOL-VILLARD */ 24759829cc1SJean-Christophe PLAGNIOL-VILLARD int onenand_default_bbt(struct mtd_info *mtd) 24859829cc1SJean-Christophe PLAGNIOL-VILLARD { 24959829cc1SJean-Christophe PLAGNIOL-VILLARD struct onenand_chip *this = mtd->priv; 25059829cc1SJean-Christophe PLAGNIOL-VILLARD struct bbm_info *bbm; 25159829cc1SJean-Christophe PLAGNIOL-VILLARD 25259829cc1SJean-Christophe PLAGNIOL-VILLARD this->bbm = malloc(sizeof(struct bbm_info)); 25359829cc1SJean-Christophe PLAGNIOL-VILLARD if (!this->bbm) 25459829cc1SJean-Christophe PLAGNIOL-VILLARD return -ENOMEM; 25559829cc1SJean-Christophe PLAGNIOL-VILLARD 25659829cc1SJean-Christophe PLAGNIOL-VILLARD bbm = this->bbm; 25759829cc1SJean-Christophe PLAGNIOL-VILLARD 25859829cc1SJean-Christophe PLAGNIOL-VILLARD memset(bbm, 0, sizeof(struct bbm_info)); 25959829cc1SJean-Christophe PLAGNIOL-VILLARD 26059829cc1SJean-Christophe PLAGNIOL-VILLARD /* 1KB page has same configuration as 2KB page */ 26159829cc1SJean-Christophe PLAGNIOL-VILLARD if (!bbm->badblock_pattern) 26259829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->badblock_pattern = &largepage_memorybased; 26359829cc1SJean-Christophe PLAGNIOL-VILLARD 26459829cc1SJean-Christophe PLAGNIOL-VILLARD return onenand_scan_bbt(mtd, bbm->badblock_pattern); 26559829cc1SJean-Christophe PLAGNIOL-VILLARD } 266