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    SubjectRe: [PATCH v3 0/3] mtd: nand: gpmi: add proper raw access support
    On Tue, Sep 23, 2014 at 04:07:33PM +0200, Boris BREZILLON wrote:
    > Hello Huang, Brian,
    >
    > This is just a new proposal to support raw accesses in a more standard way
    > in the GPMI driver.
    > This series has been tested on an imx28 board.
    >
    > Any suggestions are welcome.
    >
    > Best Regards,
    >
    > Boris
    >
    > Changes since v2:
    > - fixed a bug in gpmi_move_bits
    > - add a raw_buffer field to be used when using raw access methods
    > (experienced memory corruptions when directly using page_buffer_virt
    > buffer)
    > - add raw OOB access functions

    I tested this patch set today with the imx6dl-sabreauto board.

    NAND: Micron MT29F64G08CBABAWP
    8192MiB, MLC, page size: 8192, OOB size: 744

    ECC: 40bit

    The result:

    [ 3672.779009] ==================================================
    [ 3672.784974] mtd_nandbiterrs: MTD device: 0
    [ 3672.789480] mtd_nandbiterrs: MTD device size 16777216, eraseblock=2097152, page=8192, oob=744
    [ 3672.798169] mtd_nandbiterrs: Device uses 1 subpages of 8192 bytes
    [ 3672.804554] mtd_nandbiterrs: Using page=0, offset=0, eraseblock=0
    [ 3672.812497] mtd_nandbiterrs: incremental biterrors test
    [ 3672.818688] mtd_nandbiterrs: write_page
    [ 3672.825529] mtd_nandbiterrs: rewrite page
    [ 3672.837290] mtd_nandbiterrs: read_page
    [ 3672.848407] mtd_nandbiterrs: error: read failed at 0x0
    [ 3672.853644] mtd_nandbiterrs: After 0 biterrors per subpage, read reported error -74
    [ 3672.862932] mtd_nandbiterrs: finished successfully.
    [ 3672.867837] ==================================================

    [ 3745.282368] ==================================================
    [ 3745.288227] mtd_nandbiterrs: MTD device: 0
    [ 3745.292913] mtd_nandbiterrs: MTD device size 16777216, eraseblock=2097152, page=8192, oob=744
    [ 3745.301897] mtd_nandbiterrs: Device uses 1 subpages of 8192 bytes
    [ 3745.308023] mtd_nandbiterrs: Using page=1, offset=8192, eraseblock=0
    [ 3745.316778] mtd_nandbiterrs: incremental biterrors test
    [ 3745.323017] mtd_nandbiterrs: write_page
    [ 3745.328616] mtd_nandbiterrs: rewrite page
    [ 3745.334191] mtd_nandbiterrs: read_page
    [ 3745.346878] mtd_nandbiterrs: error: read failed at 0x2000
    [ 3745.352352] mtd_nandbiterrs: After 0 biterrors per subpage, read reported error -74
    [ 3745.361281] mtd_nandbiterrs: finished successfully.
    [ 3745.366173] ==================================================


    Is this okay?

    thanks
    Huang Shijie


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