ad0 READ_DMA TIMEOUT errors on install of 7.0-RELEASE

Jeremy Chadwick koitsu at freebsd.org
Tue Mar 25 01:44:55 PDT 2008


On Tue, Mar 25, 2008 at 01:43:30AM -0700, Jeremy Chadwick wrote:
> On Tue, Mar 25, 2008 at 08:32:07AM +0100, Gianni wrote:
> > On 22/mar/08, at 04:52, Jeremy Chadwick wrote:
> >> On Fri, Mar 21, 2008 at 06:27:19PM +0100, Gianni Doe wrote:
> >>> I'm also experiencing this issue after upgrading to 7.0-RELEASE from 6.3
> >> The most I can provide is here:
> >> http://wiki.freebsd.org/JeremyChadwick/Commonly_reported_issues
> >
> >> Workaround: Set hw.ata.ata_dma=0 in /boot/loader.conf. This will disable 
> >> use of DMA in the ATA/SATA subsystem;
> >
> > I'm afraid the workaround doesn't work for me, I set hw.ata.ata_dma="0" in 
> > loader.conf and the problem still occurs.
> > Just to double-check...
> > # sysctl hw.ata.ata_dma
> > hw.ata.ata_dma: 0
> 
> Are you using PATA or SATA disks?

I re-read your mail -- sorry.  You're using SATA.

I'll update my Wiki page to state that the loader.conf DMA disable trick
only works for PATA.

In the interim, I recommend you contact Scott Long, especially if your
problem is easily repeatable.  He's offered to help track this down.

-- 
| Jeremy Chadwick                                    jdc at parodius.com |
| Parodius Networking                           http://www.parodius.com/ |
| UNIX Systems Administrator                      Mountain View, CA, USA |
| Making life hard for others since 1977.                  PGP: 4BD6C0CB |



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