linux-kernel - Re: [PATCH] ide: motherboard-info based blacklist for ide-dma

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Message-Id: <200901221601.38362.bzolnier@gmail.com>
Date:	Thu, 22 Jan 2009 16:01:38 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Dmitry Gryazin <gdu@....spb.ru>
Cc:	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Kirill Smelkov <kirr@....spb.ru>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, navy-patches@....spb.ru
Subject: Re: [PATCH] ide: motherboard-info based blacklist for ide-dma

On Thursday 22 January 2009, Dmitry Gryazin wrote:
> On Friday 16 January 2009 03:35:44 pm Sergei Shtylyov wrote:
> > Hello.
> >
> > Dmitry Gryazin wrote:
> > >>>> True.  However it should be possible to handle it correctly by adding
> > >>>> the
> > >>>> DMA quirk to the respective host drivers (seems to be via82cxxx.c in
> > >>>> case of
> > >>>> IEI PCISA-C3/EDEN).
> > >>>
> > >>>   Yeah, this seems a viable approach...
> > >>>
> > >>>> Kirill, could you please look into adding such quirk to via82cxxx
> > >>>> instead?
> > >>>>
> > >>>> [ It seems the best place to add it would be via_init_one() as we
> > >>>> could just
> > >>>
> > >>>   No, not really -- the issue is not at all as simple as this patch
> > >>> tried to present it. Looking at its "Quick Startup Reference"
> > >>> (http://f.ipc2u.ru/files/add/doc/496/M_PCISA-C800EV_ENG.pdf), the EPIC
> > >>> board has *two* normal IDE connectors in addition to the CF slot
> > >>> (connected to the secondary port -- and it seems possible that a hard
> > >>> drive can be connected to the same port as CF), so the right place
> > >>> seems to rather be in [mu]dma_filter() methods -- and the decision
> > >>> should be strictly based on the drive type indicating CF, i.e. by
> > >>> calling ata_id_is_cfa().
> 
> I have tried my old Trancend 64Mb, RamStar 521Mb and NCP 64Mb cards. My old 
> cards returned right id[ATA_ID_CONFIG] = 0x848A.
> 
> But I have to use Kingston CF Card 1Gb 2008.
> ata_id_is_cfa() returns 0 for it and
> id[ATA_ID_MAJOR_VER]	= 0
> id[ATA_ID_CONFIG]		= 0x044A
> 
> I have only CF+ specification revision 2.0, but I've found in wiki:
> (http://en.wikipedia.org/wiki/CompactFlash#CF.2B_specification_revisions)
> "... While the current revision 4.1 from 2004 works only in ATA mode, ..."
> 
> So I have reached an impasse. How to identify modern CF cards?

Sorry that I missed it before but if indeed normal IDE devices/connectors can
be used with IDE2 then I see no sane/reliable way to detect CF devices using
buggy on-board slot... unless this slot is hardwired to be master (or slave)?

Thanks,
Bart
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