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 10:57:49 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jan Engelhardt <jengelh@...ozas.de>
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 }'

> >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?

We then hurt all the people with perfectly good working UDMA CF devices.
The kernel will eventually fall back from UDMA to PIO but it favours
working hardware by default.
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