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.p...@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)
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