Micron NAND MT29F8G08AAAWP new structure support ?

[Gregory Medwed]

Hello,
I'm having the same problem as describe by Francesco (in the email below)
with MICRON MT29F8G08AAAWP device.
Micron new NAND internal structure is:
4096 Bytes + 218 Bytes (OOB) = 1 page
256 kBytes + 13 kBytes (OOB) = 1 block (64 pages)
4.304 Mbytes = plane (2048 blocks)

Is there a plan to support this new device structure in the MTD driver and
utils ?

Best regards

Gregory


>Hi all,
>I am trying to make this Micron NAND flash to work:
>http://www.micron.com/products/partdetail?part=MT29F32G08QAAWP
>it is a 32 gigabit divided into two 16 gigabit device and now, for
>simplicity, I am working only on the first one.
>The kernel I am using is the last 2.6.28.4.
>The flash has a spare area of 218 bytes so the MTD driver calculate an
>OOB size of 128 bytes and then it throws a BUG in the function
>nand_scan_tail ("no oob scheme defined for oobsize 128").
>I have tried to add this schema at the beginning on nand_base.c:
>
>static struct nand_ecclayout nand_oob_128 = {
>    .eccbytes = 48,
>    .eccpos = {
>    80,  81,  82,  83,  84,  85,  86,  87,
>    88,  89,  90,  91,  92,  93,  94,  95,
>    96,  97,  98,  99, 100, 101, 102, 103,
>    104, 105, 106, 107, 108, 109, 110, 111,
>    112, 113, 114, 115, 116, 117, 118, 119,
>    120, 121, 122, 123, 124, 125, 126, 127},
>    .oobfree = {
>        {.offset = 2,
>         .length = 78}}
>};
>
>and then adding:
>        case 128:
>            chip->ecc.layout = &nand_oob_128;
>in nand_scan_tail.
>
>Doing that resolve the kernel BUG but flash_eraseall claims that it
>can't read oobinfo.
>I have resolved also this problem by expanding the array eccpos in the
>structure nand_oobinfo to 64 even in the kernel than in the user space
>utility.
>
>Now flash_eraseall -j works fine but when I mount the device it ends with:
>Cowardly refusing to erase block on filesystem with no valid JFFS2 node
>
>After erasing the flash without the -j option I was able to mount the
>device but whenever I copy a file into it I have a kernel BUG at
>fs/jffs2/file.c:251
>
>Now I am stuck at this point and I am asking if you have any suggestion
>on how to use this flash.
>
>Thanks,
>Francesco