Re: kern/43569

[daniel.meynen%homily-service.net@localhost]

The following reply was made to PR kern/43569; it has been noted by GNATS.

From: daniel.meynen%homily-service.net@localhost
To: gnats-bugs%NetBSD.org@localhost
Cc: pooka%cs.hut.fi@localhost
Subject: Re: kern/43569
Date: Tue, 06 Jul 2010 10:33:20 +0200

 Antti, 
 
  
 
 Thank you very much for your help! 
 
 It is a good solution.  I can now mount a cd or a dvd without waiting for a 
 long time...  Any cd is mounted immediately, but with dma and u-dma disabled
 for any cd. 
 
 Nevertheless, David Holland has just sent me a message saying that the dvd 
 drive I have should correctly work with the ahcisata driver...  Maybe 
 another solution? 
 
 Daniel 
 
  
 
  
 
  
 
 Antti Kantee writes: 
 
 > The following reply was made to PR kern/43569; it has been noted by GNATS. 
 > 
 > From: Antti Kantee <pooka%cs.hut.fi@localhost>
 > To: gnats-bugs%netbsd.org@localhost
 > Cc: 
 > Subject: Re: kern/43569
 > Date: Mon, 5 Jul 2010 11:49:50 +0300 
 > 
 >  When I've been in similar situations and have been unable to figure
 >  out what's wrong with DMA, I've compiled the kernel so that DMA is
 >  disabled for the cd.  The cd of course uses a lot more CPU that way,
 >  but at least you don't have to wait a long time for the initial access.
 >  You can do this by changing the cd line in the kernel config to the
 >  following:
 >  
 >      cd*     at atapibus? drive ? flags 0x0ffc
 >  
 >  Disclaimer: I didn't verify it works, so there might be a typo there.
 >  See comments in GENERIC for more info.
 >  
 >  I don't know what the normal user way of doing that is supposed to be,
 >  but since you appear to have your own kernel, you might as well give
 >  that a go as a workaround.
 >