linux-kernel - Re: [PATCH 5/5] falconide/q40ide: add ->atapi_*put_bytes and ->ata_*put

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Date:	Tue, 1 Apr 2008 10:32:44 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Michael Schmitz <schmitz@...ragd.biophys.uni-duesseldorf.de>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Linux/m68k <linux-m68k@...r.kernel.org>,
	Michael Schmitz <schmitz@...ian.org>
Subject: Re: [PATCH 5/5] falconide/q40ide: add ->atapi_*put_bytes and
 ->ata_*put_data methods

Alan Cox writes:
 > > Sorry for the mess in core code - ist there any other way for only driveid
 > > and packet data getting swapped? And can we actually use the device mapper
 > > to byte-swap the root partition?
 > 
 > Device Mapper can certainly support that if needed - I don't think it has
 > a swab target currently but byteswapped is just a very bad crypto
 > algorithm so you can use dm crypt target as a reference. Might not be a
 > bad idea just to make the media shareable.
 > 
 > The only other way I can see to do it would be to split the ATA transfer
 > functions into two sets one for media data and one for other stuff - but
 > then how do you handle iso9660 cd ?

I had a brief look at this a little while ago, as I was looking at
the hacks Debian applies to make 2.6.x IDE work on Atari/ARAnym.
As I understood it the problem was some IDENTIFY command which needed
to not byteswap (the hack byteswaps a second time). Can't the driver
inspect the command type and choose whether to swap or not?

I had a grand plan of writing a pata_falconide libata driver, but
ran out of steam :-(
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