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NAND: Scan bad blocks lazily. 

Rather than scanning on boot, scan upon the first attempt to check the
badness of a block.  This speeds up boot when not using NAND, and reduces
the likelihood of needing to reflash via JTAG if NAND becomes
nonfunctional.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Ilya Yanok 2008-06-30 15:34:40 +02:00 committed by Scott Wood
parent dfbf617ff0
commit 13f0fd94e3
2 changed files with 9 additions and 3 deletions
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10
drivers/mtd/nand/nand_base.c
View File

@ -457,6 +457,11 @@ static int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip,
{
struct nand_chip *chip = mtd->priv;
if (!(chip->options & NAND_BBT_SCANNED)) {
chip->scan_bbt(mtd);
chip->options |= NAND_BBT_SCANNED;
}
if (!chip->bbt)
return chip->block_bad(mtd, ofs, getchip);
@ -2721,10 +2726,9 @@ int nand_scan_tail(struct mtd_info *mtd)
/* Check, if we should skip the bad block table scan */
if (chip->options & NAND_SKIP_BBTSCAN)
return 0;
chip->options |= NAND_BBT_SCANNED;
/* Build bad block table */
return chip->scan_bbt(mtd);
return 0;
}
/* module_text_address() isn't exported, and it's mostly a pointless

2
include/linux/mtd/nand.h
View File

@ -204,6 +204,8 @@ typedef enum {
(e.g. because it needs them DMA-coherent */
#define NAND_OWN_BUFFERS 0x00040000
/* Options set by nand scan */
/* bbt has already been read */
#define NAND_BBT_SCANNED 0x40000000
/* Nand scan has allocated controller struct */
#define NAND_CONTROLLER_ALLOC 0x80000000