gpmi-nand driver and jffs2 support

[Huang Shijie]

On Fri, Aug 30, 2013 at 04:24:53PM +0200, Hector Palacios wrote:
> Dear Huang,
> 
> On 08/30/2013 11:55 AM, Huang Shijie wrote:
> >于 2013年08月30日 17:15, Hector Palacios 写道:
> >>Hello,
> >>
> >>Working on my custom platform based on i.MX28 (and also with the
> >>MX28EVK) I checked that I cannot mount JFFS2 nand partitions because
> >>I'm getting this error:
> >>
> >>jffs2: inconsistent device description
> >>
> >>which seems to have to do with the OOB area of the NAND.
> >>I saw patchset [1] from Huang Shijie which seems to be related to the
> >>issue. I just wanted to confirm if other people has the same problem
> >>and if the patchset really aims to solve this, or mine is a different
> >>issue.
> >>
> >yes, this patch set aims to solve this.
> >
> >You can try the SLC on the imx28.
> >
> >I only tested the SLC On the imx6q.
> 
> I applied the patchset but I still get the same error when trying to
> mount a JFFS2 filesystem. My nand is:
> 
> [    0.819654] ONFI param page 0 valid
> [    0.823179] ONFI flash detected
> [    0.826344] NAND device: Manufacturer ID: 0x2c,Chip ID: 0xaa (Micron MT29F2G08ABBEAH4)
> [    0.834455] NAND device: 256MiB, SLC, page size: 2048, OOB size: 64
> 

Could you print out the spare bytes of the oob area?

---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index cc0306b..5461189 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -217,6 +217,7 @@ static bool set_geometry_by_ecc_info(struct gpmi_nand_data *this)
 	if (geo->page_size < mtd->writesize + mtd->oobsize) {
 		of->offset = geo->page_size - mtd->writesize;
 		of->length = mtd->oobsize - of->offset;
+		printk("[ %s ] %d, %d\n", __func__, of->offset, of->length);
 	}
 
 	geo->payload_size = mtd->writesize;
-- 


> The same happens on the MX28EVK where I use nand:
> 
> [    0.894127] NAND device: Manufacturer ID: 0xec,Chip ID: 0xdc
> (Samsung NAND 512MiB 3,3V 8-bit)

the gpmi may fails with the Samsung nand, because it may does not have
spare bytes in the oob area.


thanks
Huang Shijie