From: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>
To: <syphir@syphir.sytes.net>
Subject: Re: Changes to ide-probe.c in 2.6.9-rc2 causing improper detection
Date: Tue, 14 Sep 2004 13:59:27 +0200
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Cc: "'Jens Axboe'" <axboe@suse.de>, <linux-kernel@vger.kernel.org>,
       "'Alan Cox'" <alan@lxorguk.ukuu.org.uk>
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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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