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
231221ce45SMasahiro 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 */
check_short_pattern(uint8_t * buf,int len,int paglen,struct nand_bbt_descr * td)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 */
create_bbt(struct mtd_info * mtd,uint8_t * buf,struct nand_bbt_descr * bd,int chip)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 */
onenand_memory_bbt(struct mtd_info * mtd,struct nand_bbt_descr * bd)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 */
onenand_isbad_bbt(struct mtd_info * mtd,loff_t offs,int allowbbt)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
163*166cae20SMasahiro Yamada pr_debug("onenand_isbad_bbt: bbt info for offs 0x%08x: (block %d) 0x%02x\n",
16459829cc1SJean-Christophe PLAGNIOL-VILLARD (unsigned int)offs, block >> 1, res);
16559829cc1SJean-Christophe PLAGNIOL-VILLARD
16659829cc1SJean-Christophe PLAGNIOL-VILLARD switch ((int)res) {
16759829cc1SJean-Christophe PLAGNIOL-VILLARD case 0x00:
16859829cc1SJean-Christophe PLAGNIOL-VILLARD return 0;
16959829cc1SJean-Christophe PLAGNIOL-VILLARD case 0x01:
17059829cc1SJean-Christophe PLAGNIOL-VILLARD return 1;
17159829cc1SJean-Christophe PLAGNIOL-VILLARD case 0x02:
17259829cc1SJean-Christophe PLAGNIOL-VILLARD return allowbbt ? 0 : 1;
17359829cc1SJean-Christophe PLAGNIOL-VILLARD }
17459829cc1SJean-Christophe PLAGNIOL-VILLARD
17559829cc1SJean-Christophe PLAGNIOL-VILLARD return 1;
17659829cc1SJean-Christophe PLAGNIOL-VILLARD }
17759829cc1SJean-Christophe PLAGNIOL-VILLARD
17859829cc1SJean-Christophe PLAGNIOL-VILLARD /**
17959829cc1SJean-Christophe PLAGNIOL-VILLARD * onenand_scan_bbt - [OneNAND Interface] scan, find, read and maybe create bad block table(s)
18059829cc1SJean-Christophe PLAGNIOL-VILLARD * @param mtd MTD device structure
18159829cc1SJean-Christophe PLAGNIOL-VILLARD * @param bd descriptor for the good/bad block search pattern
18259829cc1SJean-Christophe PLAGNIOL-VILLARD *
18359829cc1SJean-Christophe PLAGNIOL-VILLARD * The function checks, if a bad block table(s) is/are already
18459829cc1SJean-Christophe PLAGNIOL-VILLARD * available. If not it scans the device for manufacturer
18559829cc1SJean-Christophe PLAGNIOL-VILLARD * marked good / bad blocks and writes the bad block table(s) to
18659829cc1SJean-Christophe PLAGNIOL-VILLARD * the selected place.
18759829cc1SJean-Christophe PLAGNIOL-VILLARD *
18859829cc1SJean-Christophe PLAGNIOL-VILLARD * The bad block table memory is allocated here. It must be freed
18959829cc1SJean-Christophe PLAGNIOL-VILLARD * by calling the onenand_free_bbt function.
19059829cc1SJean-Christophe PLAGNIOL-VILLARD *
19159829cc1SJean-Christophe PLAGNIOL-VILLARD */
onenand_scan_bbt(struct mtd_info * mtd,struct nand_bbt_descr * bd)19259829cc1SJean-Christophe PLAGNIOL-VILLARD int onenand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
19359829cc1SJean-Christophe PLAGNIOL-VILLARD {
19459829cc1SJean-Christophe PLAGNIOL-VILLARD struct onenand_chip *this = mtd->priv;
19559829cc1SJean-Christophe PLAGNIOL-VILLARD struct bbm_info *bbm = this->bbm;
19659829cc1SJean-Christophe PLAGNIOL-VILLARD int len, ret = 0;
19759829cc1SJean-Christophe PLAGNIOL-VILLARD
198cacbe919SAmul Kumar Saha len = this->chipsize >> (this->erase_shift + 2);
19959829cc1SJean-Christophe PLAGNIOL-VILLARD /* Allocate memory (2bit per block) */
20059829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->bbt = malloc(len);
201dfe64e2cSSergey Lapin if (!bbm->bbt)
20259829cc1SJean-Christophe PLAGNIOL-VILLARD return -ENOMEM;
20359829cc1SJean-Christophe PLAGNIOL-VILLARD /* Clear the memory bad block table */
20459829cc1SJean-Christophe PLAGNIOL-VILLARD memset(bbm->bbt, 0x00, len);
20559829cc1SJean-Christophe PLAGNIOL-VILLARD
20659829cc1SJean-Christophe PLAGNIOL-VILLARD /* Set the bad block position */
20759829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->badblockpos = ONENAND_BADBLOCK_POS;
20859829cc1SJean-Christophe PLAGNIOL-VILLARD
20959829cc1SJean-Christophe PLAGNIOL-VILLARD /* Set erase shift */
21059829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->bbt_erase_shift = this->erase_shift;
21159829cc1SJean-Christophe PLAGNIOL-VILLARD
21259829cc1SJean-Christophe PLAGNIOL-VILLARD if (!bbm->isbad_bbt)
21359829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->isbad_bbt = onenand_isbad_bbt;
21459829cc1SJean-Christophe PLAGNIOL-VILLARD
21559829cc1SJean-Christophe PLAGNIOL-VILLARD /* Scan the device to build a memory based bad block table */
21659829cc1SJean-Christophe PLAGNIOL-VILLARD if ((ret = onenand_memory_bbt(mtd, bd))) {
21759829cc1SJean-Christophe PLAGNIOL-VILLARD printk(KERN_ERR
21859829cc1SJean-Christophe PLAGNIOL-VILLARD "onenand_scan_bbt: Can't scan flash and build the RAM-based BBT\n");
21959829cc1SJean-Christophe PLAGNIOL-VILLARD free(bbm->bbt);
22059829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->bbt = NULL;
22159829cc1SJean-Christophe PLAGNIOL-VILLARD }
22259829cc1SJean-Christophe PLAGNIOL-VILLARD
22359829cc1SJean-Christophe PLAGNIOL-VILLARD return ret;
22459829cc1SJean-Christophe PLAGNIOL-VILLARD }
22559829cc1SJean-Christophe PLAGNIOL-VILLARD
22659829cc1SJean-Christophe PLAGNIOL-VILLARD /*
22759829cc1SJean-Christophe PLAGNIOL-VILLARD * Define some generic bad / good block scan pattern which are used
22859829cc1SJean-Christophe PLAGNIOL-VILLARD * while scanning a device for factory marked good / bad blocks.
22959829cc1SJean-Christophe PLAGNIOL-VILLARD */
23059829cc1SJean-Christophe PLAGNIOL-VILLARD static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
23159829cc1SJean-Christophe PLAGNIOL-VILLARD
23259829cc1SJean-Christophe PLAGNIOL-VILLARD static struct nand_bbt_descr largepage_memorybased = {
23359829cc1SJean-Christophe PLAGNIOL-VILLARD .options = 0,
23459829cc1SJean-Christophe PLAGNIOL-VILLARD .offs = 0,
23559829cc1SJean-Christophe PLAGNIOL-VILLARD .len = 2,
23659829cc1SJean-Christophe PLAGNIOL-VILLARD .pattern = scan_ff_pattern,
23759829cc1SJean-Christophe PLAGNIOL-VILLARD };
23859829cc1SJean-Christophe PLAGNIOL-VILLARD
23959829cc1SJean-Christophe PLAGNIOL-VILLARD /**
24059829cc1SJean-Christophe PLAGNIOL-VILLARD * onenand_default_bbt - [OneNAND Interface] Select a default bad block table for the device
24159829cc1SJean-Christophe PLAGNIOL-VILLARD * @param mtd MTD device structure
24259829cc1SJean-Christophe PLAGNIOL-VILLARD *
24359829cc1SJean-Christophe PLAGNIOL-VILLARD * This function selects the default bad block table
24459829cc1SJean-Christophe PLAGNIOL-VILLARD * support for the device and calls the onenand_scan_bbt function
24559829cc1SJean-Christophe PLAGNIOL-VILLARD */
onenand_default_bbt(struct mtd_info * mtd)24659829cc1SJean-Christophe PLAGNIOL-VILLARD int onenand_default_bbt(struct mtd_info *mtd)
24759829cc1SJean-Christophe PLAGNIOL-VILLARD {
24859829cc1SJean-Christophe PLAGNIOL-VILLARD struct onenand_chip *this = mtd->priv;
24959829cc1SJean-Christophe PLAGNIOL-VILLARD struct bbm_info *bbm;
25059829cc1SJean-Christophe PLAGNIOL-VILLARD
25159829cc1SJean-Christophe PLAGNIOL-VILLARD this->bbm = malloc(sizeof(struct bbm_info));
25259829cc1SJean-Christophe PLAGNIOL-VILLARD if (!this->bbm)
25359829cc1SJean-Christophe PLAGNIOL-VILLARD return -ENOMEM;
25459829cc1SJean-Christophe PLAGNIOL-VILLARD
25559829cc1SJean-Christophe PLAGNIOL-VILLARD bbm = this->bbm;
25659829cc1SJean-Christophe PLAGNIOL-VILLARD
25759829cc1SJean-Christophe PLAGNIOL-VILLARD memset(bbm, 0, sizeof(struct bbm_info));
25859829cc1SJean-Christophe PLAGNIOL-VILLARD
25959829cc1SJean-Christophe PLAGNIOL-VILLARD /* 1KB page has same configuration as 2KB page */
26059829cc1SJean-Christophe PLAGNIOL-VILLARD if (!bbm->badblock_pattern)
26159829cc1SJean-Christophe PLAGNIOL-VILLARD bbm->badblock_pattern = &largepage_memorybased;
26259829cc1SJean-Christophe PLAGNIOL-VILLARD
26359829cc1SJean-Christophe PLAGNIOL-VILLARD return onenand_scan_bbt(mtd, bbm->badblock_pattern);
26459829cc1SJean-Christophe PLAGNIOL-VILLARD }
265