From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff Garzik <jgarzik@pobox.com>
Subject: Re: [rfc][patch] ide: fix unneeded LBA48 taskfile registers access
Date: Mon, 07 Feb 2005 03:58:08 -0500
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References: <Pine.GSO.4.58.0502062348200.2763@mion.elka.pw.edu.pl> <4206F2E5.7020501@gmail.com>
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To: Tejun Heo <htejun@gmail.com>, Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>
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FWIW, there are two limitations of libata in this area:

1) ISTR some PATA vendor-specific commands have a very specific set of 
input and output registers to use, and input/output sets of registers 
may differ from each other.

2) libata is lazy, and just reads registers in "groups":  the 
lbaH/M/L/nsect registers, the device register, etc.