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    SubjectRe: Changes to ide-probe.c in 2.6.9-rc2 causing improper detection
    Date

    always cc: linux-ide@vger.kernel.org on ATA stuff

    On Tuesday 14 September 2004 09:03, C.Y.M. wrote:
    >
    > >
    > > On Mon, Sep 13 2004, C.Y.M. wrote:
    > > > After installing 2.6.9-rc2 on my PC today (x86 VIA Chipset
    > > motherboard and
    > > > Athlon XP CPU), The IDE detection during boot in probing
    > > for ide2-5 and
    > > > displaying errors, and the hard drives that it does find
    > > are telling me that
    > > > "hda: cache flushes not supported" (when they are displayed
    > > as supported
    > > > when using 2.6.9-rc1.
    > >
    > > Your drive doesn't advertise FLUSH_CACHE support, the model
    > > for when we
    > > use these commands changed between -rc1 and -rc2. This
    > > essentially means
    > > that you have to turn off write back caching for safe operations on a
    > > journalled drive.
    > >
    > > Alan, I bet there are a lot of these. Maybe we should consider letting
    > > the user manually flag support for FLUSH_CACHE, at least it
    > > is in their
    > > hands then.
    > >
    > > --
    > > Jens Axboe
    > >
    >
    > Thanks for the explanation. I can understand that some of the older drives
    > will not support FLUSH_CACHE which is acceptable. On another note, since
    > most computers only have IDE0 and IDE1 slots, is there a way to prevent the
    > probe from returning errors on boot when looking for IDE2 to IDE5? Perhaps

    errros? these are innocent KERN_DEBUG messages

    > a kernel configuration option asking how many IDE's are expected to probe
    > (defaulting to two)?

    grep drivers/ide/Kconfig IDE_GENERIC

    > Best Regards,
    > C.Y.M.
    -
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