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make creation of nand bad block table optional

PATCH New Harald Welte 2 participants 2 messages Jul 6, 2008 – Jul 7, 2008

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Memory technology devices (MTD) NAND flash
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Harald Welte

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#0 lore raw

PATCH 1/1 make creation of nand bad block table optional

[PATCH] add new NAND_DONT_CRATE_BBT flag

This patch makes creation of the BBT optional.

It adds a new platform-independent NAND-wide flag NAND_DONT_CREATE_BBT

This flag can be used by the board_nand_init function of a board. It is used by the soon-to-be-submitted board support code for various openmoko products.

Signed-off-by Werner Almesberger <[email protected]>
Signed-off-by Harald Welte <[email protected]>

---

drivers/mtd/nand/nand_bbt.c +2 -1
index 748b266..27d5988 100644
@@ -678,7 +678,8 @@ static int check_create (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_des
 		}
 create:
 		/* Create the bad block table by scanning the device ? */
-		if (!(td->options & NAND_BBT_CREATE))
+		if (!(td->options & NAND_BBT_CREATE) ||
+		  (this->options & NAND_DONT_CREATE_BBT))
 			continue;
 
 		/* Create the table in memory by scanning the chip(s) */
include/linux/mtd/nand.h +2 -1
index 4cc4a7d..698ab2b 100644
@@ -187,7 +187,8 @@ extern int nand_read_raw (struct mtd_info *mtd, uint8_t *buf, loff_t from, size_
  * This can only work if we have the ecc bytes directly behind the
  * data bytes. Applies for DOC and AG-AND Renesas HW Reed Solomon generators */
 #define NAND_HWECC_SYNDROME	0x00020000
-
+/* Do not create an BBT if none is found. Overrides NAND_BBT_CREATE. */
+#define NAND_DONT_CREATE_BBT	0x00040000
 
 /* Options set by nand scan */
 /* Nand scan has allocated oob_buf */
Signature · 11 lines
- Harald Welte <[email protected]>           http://laforge.gnumonks.org/
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#1 lore raw

PATCH 1/1 make creation of nand bad block table optional

Quoted 5 lines · Harald Welte

[PATCH] add new NAND_DONT_CRATE_BBT flag

This patch makes creation of the BBT optional.

It adds a new platform-independent NAND-wide flag NAND_DONT_CREATE_BBT

The testing branch of u-boot-nand-flash already has NAND_SKIP_BBTSCAN.

Are the semantics of this any different?

-Scott