Re: ide-cd problem in 2.6.12-rc5 + todays snapshot

[Jens Axboe]

On Thu, May 26 2005, Jens Axboe wrote:
> On Thu, May 26 2005, Meelis Roos wrote:
> > Background: I have a Sony CDU5211 CD drive with Intel D815EEA2 mainboard 
> > (ICH2 IDE in 815 chipset). Since 2.4.21 timeframe IDE DMA for this CD 
> > drive is broken (see my post 
> > http://www.ussg.iu.edu/hypermail/linux/kernel/0410.3/0480.html). This 
> > happens on at least 2 identical machines. This is the first problem 
> > (that I have learned to live with).
> > 
> > Now, since ide-cd dma is broken, the first access to cd always gets DMA 
> > timeout and turns off DMA, then it works. I have hddtemp installed and 
> > it probes for drives on boot. In 2.6.12 (and I think I tested pristine 
> > 2.6.12-rc5 too) the cd works as before - dma timeout+disable on first 
> > access (by hddtemp).
> > 
> > Now, in 2.6.12-rc5 + todays git snapshot, it does not work any more. I 
> > suspect the DMA alignment change.
> 
> It must be, thanks for reporting this so quickly. Linus, can you exclude
> that patch again? Rather miserably slow burning for some, than broken
> hardware for others.
> 
> Seems we do need finer granularity setting of alignment/length
> restrictions.

BTW Meelis, any chance you can change that 3 into a 15 for testing
purposes?

-- 
Jens Axboe

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