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Date: Mon, 25 Mar 2013 14:59:51 +0100
From: Marius Strobl <marius@alchemy.franken.de>
To: Chris Ross <cross+freebsd@distal.com>
Subject: Re: CAM timeouts on Netra X1
Message-ID: <20130325135951.GA45845@alchemy.franken.de>
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On Mon, Mar 25, 2013 at 12:31:09AM -0400, Chris Ross wrote:
> 
>   After messing with this issue for a couple of hours, I'm 99% sure that the ATA_CAM is the crux of my problem.  While fixing that issue would be the best option, I was trying a "right now" option.  I'm not sure how to build a kernel, and release.iso (or the like) without CAM.  I've been trying numerous things with modified versions of GENERIC, but am not sure I've gotten anything working the way I want it to.
> 
>   Has anyone else done this sort of custom-kernel-patched-into-a-stable sort of thing before?
> 

Err, right, ATA_CAM broke ATA_NO_48BIT_DMA. The simplest workaround
likely is to use a stock GENERIC and set the hw.ata.ata_dma loader
tunable to 0. That will globally disable DMA and not just in cases
where 48-bit DMA is needed but should get you working.
Once you've managed to install FreeBSD, could you please try whether
the following patch fixes that regression?
http://people.freebsd.org/~marius/ATA_CAM_NO_48BIT_DMA.diff

Marius