Patchwork [1/1] Fix 2k pagesize NAND on i.MX27

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Submitter Eric Benard
Date July 14, 2009, 2 p.m.
Message ID <1247580005-25011-1-git-send-email-eric@eukrea.com>
Download mbox | patch
Permalink /patch/29771/
State New
Headers show

Comments

Eric Benard - July 14, 2009, 2 p.m.
This patch allows i.MX27 to support 2k pagesize NAND flash.
We are using a Micron 1.8V NAND flash : MT29F4G08ABDWP-ET
Without this patch, all sectors are marked as bad eraseblock.

Signed-off-by: Eric Benard <eric@eukrea.com>
Acked-by : Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/mtd/nand/mxc_nand.c |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletions(-)
Artem Bityutskiy - July 15, 2009, 7:32 a.m.
Eric Benard wrote:
> This patch allows i.MX27 to support 2k pagesize NAND flash.
> We are using a Micron 1.8V NAND flash : MT29F4G08ABDWP-ET
> Without this patch, all sectors are marked as bad eraseblock.
> 
> Signed-off-by: Eric Benard <eric@eukrea.com>
> Acked-by : Sascha Hauer <s.hauer@pengutronix.de>

The previous version of your patch is sitting in l2-mtd-2.6.git
and waiting for dwmw2 already.

Patch

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 76beea4..65b26d5 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -857,6 +857,17 @@  static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
 	}
 }
 
+/* Define some generic bad / good block scan pattern which are used
+ * while scanning a device for factory marked good / bad blocks. */
+static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
+
+static struct nand_bbt_descr smallpage_memorybased = {
+	.options = NAND_BBT_SCAN2NDPAGE,
+	.offs = 5,
+	.len = 1,
+	.pattern = scan_ff_pattern
+};
+
 static int __init mxcnd_probe(struct platform_device *pdev)
 {
 	struct nand_chip *this;
@@ -973,7 +984,10 @@  static int __init mxcnd_probe(struct platform_device *pdev)
 		goto escan;
 	}
 
-	host->pagesize_2k = (mtd->writesize == 2048) ? 1 : 0;
+	if (mtd->writesize == 2048) {
+		host->pagesize_2k = 1;
+		this->badblock_pattern = &smallpage_memorybased;
+	}
 
 	if (this->ecc.mode == NAND_ECC_HW) {
 		switch (mtd->oobsize) {