freebsd stable - Jul 2008 - dvd dma problems

I have a couple of DVD drives (one drive, one burner) that used to play DVDs
quite fine from 5.3 to somewhere in the 6.x branch. Nowadays I have to send
them to PIO4 to play DVDs, because they'll just throw DMA not aligned errors
around in UDMA33 or WDMA2 mode.

Should someone be interested in this I'm willing to supply all necessary
information, such as the exact drives, firmware versions, kernel traces...
whatever comes to your mind. I'm also willing to test patches.

On Sun, Jul 13, 2008 at 05:02:00PM +0200, Dominic Fandrey
wrote:
> I have a couple of DVD drives (one drive, one burner) that used to play
DVDs
> quite fine from 5.3 to somewhere in the 6.x branch. Nowadays I have to send
> them to PIO4 to play DVDs, because they'll just throw DMA not aligned
errors
> around in UDMA33 or WDMA2 mode.
> 
> Should someone be interested in this I'm willing to supply all
necessary
> information, such as the exact drives, firmware versions, kernel traces...
> whatever comes to your mind. I'm also willing to test patches.
Is the problem you're seeing identical to this?

http://lists.freebsd.org/pipermail/freebsd-hackers/2008-July/025297.html

-- 
| 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 |