Red Hat Bugzilla – Bug 107280
using DMA for cd-rom drives during install
Last modified: 2015-01-04 17:03:30 EST
Fedora turns on dma on my old 32x cdrom during install and then it fails, something rh9 did not do. Should it really use dma for cd-roms since there are a lot of broken devices out there. Especially during install it's important that it works. I got the install to work after giving the kernel parameter ide=nodma. If dma is something we want as default maybe it could be good to add some doc about ide=nodma on the kernel help screen.
It would be good to blacklist drives which can't do DMA. What does hdparm -i say about your drive ? Additionally, we probably should say something in the release notes if we decide to keep this feature.
Isn't this a dup of bug 106685? Or does the problem occur at install time, not check time?
*** Bug 106258 has been marked as a duplicate of this bug. ***
In my case I can't read any cd-roms when dma is turned on. I've tried with both burned cdr's and normal cd-roms and it just gives a lot of errors in my log file. It's not a computer that I normally use. I'll come back with more data about the exact cd-rom models. I remember that it is a Intel 440BX computer (ABit BE6 I think), it's got a samsung 32x cdrom drive model 3232 and a mitsumu cd-burner (2X). Pretty old stuf, but still usable. Neither the burner nor the cdrom drive can read any discs (without lots of errors) when dma is turned on. With it turned off both worked fine.
anaconda now turns off DMA on all IDE CD-ROM devices (unless you pass a command line parameter) to avoid this causing problems for the install. It could still be problematic post-install, though.
*** This bug has been marked as a duplicate of 109462 ***
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.