linux-kernel - Re: 2.6.23.17 & 2.6.24.5 and maybe earlier: pata_marvell: need to disable DMA to get rid of '(ATA bus error)', 'ata7.00: status: { DRDY ERR }', 'ata7.00: error: { ICRC ABRT }'

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Date:	Fri, 2 May 2008 01:51:12 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Martin MOKREJŠ <mmokrejs@...osome.natur.cuni.cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.23.17 & 2.6.24.5 and maybe earlier: pata_marvell: need to
 disable DMA to get rid of '(ATA bus error)', 'ata7.00: status: { DRDY ERR
 }', 'ata7.00: error: { ICRC ABRT }'


On Thursday 2008-05-01 21:08, Alan Cox wrote:

>> To get rid of the errors, I can use libata.dma=0 kernel
>> command-line parameter. Unfortunately, this sets all libata
>> devices to PIO4 mode. How can I set just this one? I tried
>> 'libata.force=7.00:pio4' but it did not help.
>
>libata.dma=3 will stop DMA being used for CF devices (except those that
>decide to pretend to be ATA classes). This one comes up a lot as many CF
>adapters are simply not adequate for UDMA.

Perhaps the kernel could do this automatically once it sees the
status code?
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