At bootloader, we don't need to read full page. It takes too long time. Instead it only read pages required for boot. Of course, this patch reduces the boot time

Signed-off-by: Kyungmin Park kyungmin.park@samsung.com --- diff --git a/drivers/mtd/onenand/onenand_bbt.c b/drivers/mtd/onenand/onenand_bbt.c index c4bdb57..8bc9e8a 100644 --- a/drivers/mtd/onenand/onenand_bbt.c +++ b/drivers/mtd/onenand/onenand_bbt.c @@ -48,6 +48,43 @@ static int check_short_pattern(uint8_t * buf, int len, int paglen, return 0; }

+static int read_page_oob(struct mtd_info *mtd, loff_t from, u_char *buf) +{ + struct onenand_chip *this = mtd->priv; + struct bbm_info *bbm = this->bbm; + struct nand_bbt_descr *bd = bbm->badblock_pattern; + struct mtd_oob_ops ops; + int ret, scanlen, block, j, res; + + scanlen = 0; + + ops.mode = MTD_OOB_PLACE; + ops.ooblen = 16; + ops.oobbuf = buf; + ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0; + + /* Get block number * 2 */ + block = (int)(from >> (bbm->bbt_erase_shift - 1)); + + /* Set as normal block */ + res = 0x00; + bbm->bbt[block >> 3] |= 0x00 << (block & 0x6); + + for (j = 0; j < 2; j++) { + ret = onenand_bbt_read_oob(mtd, from + j * mtd->writesize + bd->offs, &ops); + if (ret || check_short_pattern(&buf[j * scanlen], scanlen, mtd->writesize, bd)) { + bbm->bbt[block >> 3] |= 0x03 << (block & 0x6); + res = 0x03; + printk(KERN_WARNING "Bad eraseblock %d at 0x%08x\n", + block >> 1, (unsigned int) from); + mtd->ecc_stats.badblocks++; + break; + } + } + + return ret; +} + /** * create_bbt - [GENERIC] Create a bad block table by scanning the device * @param mtd MTD device structure @@ -155,6 +192,11 @@ static int onenand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt) block = (int)(offs >> (bbm->bbt_erase_shift - 1)); res = (bbm->bbt[block >> 3] >> (block & 0x06)) & 0x03;

+ if (this->options & ONENAND_RUNTIME_BADBLOCK_CHECK) { + if (res == 0x02) + res = read_page_oob(mtd, offs, this->oob_buf); + } + MTDDEBUG (MTD_DEBUG_LEVEL2, "onenand_isbad_bbt: bbt info for offs 0x%08x: (block %d) 0x%02x\n", (unsigned int)offs, block >> 1, res); @@ -210,6 +252,12 @@ int onenand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) if (!bbm->isbad_bbt) bbm->isbad_bbt = onenand_isbad_bbt;

+ if (this->options & ONENAND_RUNTIME_BADBLOCK_CHECK) { + printk(KERN_INFO "Scanning device for bad blocks (skipped)\n"); + memset(bbm->bbt, 0xaa, len); + return 0; + } + /* Scan the device to build a memory based bad block table */ if ((ret = onenand_memory_bbt(mtd, bd))) { printk(KERN_ERR diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h index 4b0c923..76dfce4 100644 --- a/include/linux/mtd/onenand.h +++ b/include/linux/mtd/onenand.h @@ -135,6 +135,7 @@ struct onenand_chip { #define ONENAND_HAS_CONT_LOCK (0x0001) #define ONENAND_HAS_UNLOCK_ALL (0x0002) #define ONENAND_HAS_2PLANE (0x0004) +#define ONENAND_RUNTIME_BADBLOCK_CHECK (0x0200) #define ONENAND_PAGEBUF_ALLOC (0x1000) #define ONENAND_OOBBUF_ALLOC (0x2000)