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Date: Thu, 13 Apr 2006 18:03:51 -0000
To: "Anish Mistry" <mistry.7@osu.edu>, freebsd-questions@freebsd.org
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	<200604131154.07097.mistry.7@osu.edu>
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From: Martin Tournoy <carpetsmoker@gmail.com>
Cc: 
Subject: Re: DMA TIMEOUT
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On Thu, 13 Apr 2006 15:53:57 -0000, Anish Mistry <mistry.7@osu.edu> wrote:

> On Thursday 13 April 2006 07:47, Wil Hatfield wrote:
>> > I had a similar situation under 6.0. My secondary drive would
>> > throw DMA read
>> > errors at bootup, adding several minutes to the boot process, so
>> > I ran it in
>> > PIO mode. The upgrade to 6.1 solved it, both drives work fine as
>> > DMA now.
>>
>> Looks like the DMA errors are back in 6.1-RC with ATA or at least
>> similar DMA errors. The new one froze my machine with an error like
>> "Error while performing DMA_WRITE command". A new twist to the
>> WRITE_DMA Timeouts of 5.4. I am starting to think that they aren't
>> going to get the ATA issues all worked out anytime soon so they are
>> changing the errors. ;-)
>>
>> And of course no automatic reboot on panic.
> Do you have a backtrace?
>


Did you use a 80- or 40-ATA cable?
If  you've configured your drives to do UATA-66 or faster then FreeBSD (or  
any other OS for that matter) will crash if you connect a second drive...