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    Subjectlegacy megaraid driver bug in mm-series
    Date
    My AMI megaraid card no longer works with recent mm-series kernels. The
    bug appears on mm- kernels newer than 2.6.12-rc6-mm1; mainline kernels
    are not affected.

    The driver will load and detect both devices on the card (sda and sdb).
    It will scan each device and read the partition table successfully,
    however the megaraid driver message will include the following errors:

    sda: sector size 0 reported, assuming 512.
    sda: asking for cache data failed.
    sda: assuming drive cache: write through

    When the kernel tries to mount the root file system, I get the following
    error:

    ReiserFS: sda3: warning: sh-2006: read_super_block: bread failed (dev
    sda3, block 2, size 4096)
    ReiserFS: sda3: warning: sh-2006: read_super_block: bread failed (dev
    sda3, block 16, size 4096)
    VFS: Cannot open root device "sda3" or unknown-block(0,3)

    Here is a summary of the kernels I have tested for this bug:

    2.6.11-mm1: works
    2.6.11-mm4: works
    2.6.12-rc5-mm1: will not compile
    2.6.12-rc6-mm1: works
    2.6.12-mm1: will not compile megaraid driver
    2.6.12-mm2: broken
    2.6.13-mm1: broken

    2.6.12: works
    2.6.13: works

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