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:	Thu, 1 May 2008 20:08:51 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Martin MOKREJŠ <mmokrejs@...osome.natur.cuni.cz>
Cc:	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 }'

> 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.

> Where are the flags documented? linux/Documentation/ directory
> contains almost nothing about pata_marvell. :(

The flags are all common across drivers.

Alan
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