Re: kernel 2.6, optical drives and DMA
Bruce Miller(brmiller@rogers.com) is reported to have said:
> I am at a point of total frustration in figuring out whether and how to
> enable DMA on an optical drive. I am running the Debianized flavour of
> kernel 2.6.10 and the installation tracks Debian sid/unstable.
>
> As far as I understand, the problems surrounding the configuration of
> optical writers as IDE ATA(PI) devices and enabling DMA under kernel
> 2.6 are largely resolved, even though there is no resolution in sight
> to the disagreement between the kernel team and the author of cdrecord.
> At the level of one, however, I am having little success.
____[ snip ]____
>
> Questions:
> 1. Is there a way to enable DMA safely for all operations with this
> DVD/CD drive, particularly burning, video DVD playback, data disk
> reading?
Yes. DO
cdrecord dev-ATA -scanbus
then using the results of the scan
cdrecord dev=ATA:x,x,x will enable DMA. (Many msgs in the DU
Archives about this BTW)
> 2. If the answer to q1 is no, is it OK to enable DMA ("hdparm
> -d1 /dev/hde") for burning disks and for watching DVDs, but to disable
> it again before mounting data disks?
> 3. For an optical disk (as opposed to a hard disk), is it important to
> use an 80-connector IDE cable with the ATA100 controller as opposed to
> the traditional 40-connector cable?
>
> I have RTFM'ed and STFW'ed to the point of information overload. If
> there are good resources out there that I have missed, please point me
> to them. Help much appreciated. It is a testament to how solid this
> system is that this is my biggest current problem.
Search the archives of debian-user would be my first thought.
:-) HTH, YMMV, HAND :-)
WT
--
Real programmers don't write in BASIC. Actually, no programmers write
in BASIC after reaching puberty.
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