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

[C.Y.M.]

> 
> 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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