From owner-cvs-all  Wed Dec  4  0:15: 0 2002
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From: Soeren Schmidt <sos@spider.deepcore.dk>
Message-Id: <200212040814.gB48EoUY044077@spider.deepcore.dk>
Subject: Re: Serializing ATA channels [was: Re: cvs commit: src/share/man/man4
 ata.4]
In-Reply-To: <20021204011307.GA915@athlon.pn.xcllnt.net>
To: Marcel Moolenaar <marcel@xcllnt.net>
Date: Wed, 4 Dec 2002 09:14:50 +0100 (CET)
Cc: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@FreeBSD.org>,
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It seems Marcel Moolenaar wrote:
> On Tue, Dec 03, 2002 at 12:18:01PM -0800, Søren Schmidt wrote:
> > sos         2002/12/03 12:18:01 PST
> > 
> >   Modified files:
> >     share/man/man4       ata.4 
> >   Log:
> >   Add support for the PC98 platform to the ATA driver.
> >   This mostly consists of functionality to serialize accesses to
> >   the two ATA channels (which can also be used to "fix" certain
> >   PCI based controllers).
> 
> I have an ATA controller that Linux marks as having a bug and
> serializes both channels as a way to work around the bug. Given
> the added functionality, am I right in assuming that we can
> do the same in a pretty straightforward way?
> 
> Some details (for fun):
> 
> FreeBSD 5.0-CURRENT #147: Fri Nov 29 21:44:17 PST 2002
>     marcel@mckinley.pn.xcllnt.net:/nfs/p4/ia64/sys/ia64/compile/HP_RX2600
> 		:
> atapci0: <CMD 649 ATA100 controller> port 0xd40-0xd4f,0xd60-0xd63,0xd50-0xd57,0xd64-0xd67,0xd58-0xd5f irq 21 at device 2.0 on pci0
> ata2: at 0xd58 on atapci0
> ata3: at 0xd50 on atapci0
> 		:
> ata2-slave: timeout waiting for interrupt
> ata2-slave: ATAPI identify failed
> 		:
> acd0: DVD-ROM <DV-28E-B> at ata2-master PIO4

Hmm, the CMD649 should not need to have accesses serialized according
to my docs/notes, the problem you are seeing here is the dreaded
fake slave device, of which I havn't catched all cases yet...

-Søren

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