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Date: Wed, 3 Oct 2007 19:24:53 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "Mike Robak" <mrobak@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: libATA error message doc
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> (irq_stat 0x40000001)	

	IRQ status of the chip
> tag 0
	Tag (or zero for non NCQ commands)
> cmd 0xb0
	The ATA command number issued
> emask 0x1
	Internal libata error category (used to decide what to do to
recover)
> stat 0x51
	Status register of drive
> err 0x4
	Error register of drive


You want the ATA specification document from T13 (www.t13.org)

Alan