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    From"C.Y.M." <>
    SubjectRE: Changes to ide-probe.c in 2.6.9-rc2 causing improper detection
    DateTue, 14 Sep 2004 00:03:09 -0700
    > 
    > 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
    a kernel configuration option asking how many IDE's are expected to probe
    (defaulting to two)?
    
    Best Regards,
    C.Y.M.
    
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