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Message-Id: <20070328173742.B1E87619EC2@zotz.mtu.ru>
Date:	Wed, 28 Mar 2007 21:37:41 +0400
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: Testing patch for ALi PATA - fixes hopefully for the problems with ATAPI DMA

Alan Cox wrote:

> 
> This implements two things at driver level which are implemented
> implicitly by the old IDE layer
> 
> - Only doing sector sized ATAPI I/O via DMA
> - Alway writing the size values
> 
> Hopefully this will make CD devices behave better for those with the
> problems.

I am sorry to report that this did not change anything - I still get the
same timeouts on system boot during CD-ROM detection. To remind:

00:07.0 ISA bridge: ALi Corporation M1533/M1535 PCI to ISA Bridge [Aladdin
IV/V/V+]
scsi 0:0:0:0: Direct-Access     ATA      IC25N020ATDA04-0 DA3O PQ: 0 ANSI: 5
scsi 1:0:0:0: CD-ROM            TOSHIBA  DVD-ROM SD-C2502 1313 PQ: 0 ANSI: 5

BTW should not libata fail back to PIO if all DMA fails? It never does for
me; this is strange.

I am tempted to test ACPI driver if you have patch suitable for mainstream
(not -mm)

thank you

-andrey


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