Kernel SCSI emulation for CD burning - the truth

DArtagnan · Posted: Sun Jun 15, 2003 4:38 am Post subject:

Hehe, mine is also working but as u can see I have the following WARNINGS

blueworm · l33t Joined: 09 May 2003 Posts: 962

MrChucho · n00b Joined: 05 Feb 2003 Posts: 44 Location: Tulsa, OK

I followed this tutorial and got my burner working. But, I still had to add "ide-scsi=hdc" to my grub.conf. If I *don't* want to do this -- and let devfs handle everything, how/where do I indicate that my cd burner is "hdc"??

DArtagnan · Posted: Mon Jul 07, 2003 5:13 am Post subject:

Jimbow · Posted: Mon Jul 07, 2003 7:30 am Post subject:

I've recently had an annoying problem with my combo CDROM/DVD drive when playing DVD's. On most DVD's when I got to the last few minutes of the program, the DVD player would crash: mplayer, xine, and ogle.

I played around and emerged different libraries, all to no effect. Then reading the Ogle faq I noticed that they recommend using SCSI emulation to fix some strange bugs (I had converted from SCSI emulation to ide-cdrom about a month or two ago). So I recompiled my kernel removing ide-cdrom and including ide-scsi, etc and this fixed the problem.
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FastTurtle · Posted: Fri Jul 25, 2003 2:39 am Post subject: Re: warning

[qoute]As for the report above from perry saying that the kernel option was needed, well yes, things seem pretty inconsistent. I had that problem also on one machine, but not on the original machine (which worked exactly according to my original instructions above) so I guess you do have to have that in some situations. I can't put my finger on it but there must be some rationale behind it.[/qoute]

Could it have something to do with Via Chipsets:? I've got one and it has to be setup with the kernel option at boot, although I have 2 drives, the second is a plain cdrom and it's running in ide mode w/o prob. :

FastTurtle · Posted: Fri Jul 25, 2003 2:46 am Post subject:

[qoute]Perhaps devfs isn't too intelligent about determing whether a device is a CD or DVD. In fact, maybe it has no way to distinguish the difference. Have a look at devfsd.conf (the relevant section of which xamn has conveniently posted above, and look at the REGISTER lines and the "Change foo to suit your setup" comments. Maybe they need tweaking for your setup.[/quote]

It got me thinking because mine does the same thing. I suspect what causes it is the emulation mode itself. IDE is the prefered method for IDE devices and scsi is going to be the secondary mode. Due to this, when you build both into the kernel, that is why CDRecord can't locate an IDE burner, the IDE driver has it locked and defined as IDE, thus not allowing scsi emulation a chance to talk to the device. :idea:

eeknay · Posted: Fri Aug 01, 2003 5:19 pm Post subject:

hi,

well first to say this guide is awesome, i finally got it working, BUT
while using k3b i have 7 writers now

not bad huh?
well, unforunally i just need ONE. The other thing is that my reader is now not visible anylonger, since i got the writer working.

i'm using a notebook with a combo-driver CD/DVD/CD-RW
before using this guide this combo was working on /dev/hdc
my well discovered writer is now /dev/scsi/host0/bus0/target0/lunX, as i said before its there 7 times.

any ideas?
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glamdringlfo · Posted: Fri Aug 01, 2003 8:08 pm Post subject:

Hey, great guide. Thanks a lot.

I got it working after a while...the hardest part was figuring out that the modules had to be loaded in the right order, and then adding the appropriate flags to the kernel at boot.

Keep up the good work, guys. ; )

Skal!
Glamdringlfo

lamaistres · Posted: Sat Aug 16, 2003 11:09 pm Post subject:

Thank you for the nice tutorial. I now have burning capabilities.

I use gtoaster to burn CD's and if I try and record as a normal user I get a cdrecord warning about possible buffer underuns. I fixed this by editing visudo and using the command "sudo gtoaster". Works great.

Thanks again.
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bryon · Apprentice Joined: 14 Feb 2003 Posts: 163

Any pointers on what I should do if it is a external USB one. More specifically a HP 8210e that runs at 4x. One of the many things that I have to have enabled is the mass storage support right?

Snakey · n00b Joined: 19 Aug 2003 Posts: 10

Hello people, after reading this guide for SCSI emulation, I encountered a weird problem. 1st of all I'm a total newbie when it comes to linux and I couldn't understand this.
I setup my bootsplash (instructions here!: https://forums.gentoo.org/viewtopic.php?t=49036) and when it came to the part of adding the bootsplash screen to the other VT's, everything ran fine until I added the hdc=ide-scsi to the kernel line on my grub.conf. Does anyone have any idea what the problem is or if there's anywhere else I could add that hdc=ide-scsi so it wouldn't conflict with my VT bootsplash screens? Thank you!

dorkus · n00b Joined: 17 Sep 2003 Posts: 3

hi, im new and thought i would ask, in case this isnt the same problem.

i got gentoo on a dell inspiron 5100. everything works except the cd drive.
i installed using the drive, but in normal operation it doesnt let me access anything on the cd. i know it has something to do with scsi-ide stuff, but im kind of a newb with linux. any help is appreciated. sorry i cant provide more info, i don't have the computer here. the cd drive is a CD-RW/DVD drive.

silux · Tux's lil' helper Joined: 24 May 2003 Posts: 92

I followed the tutorial and I don't think I'm missing anything but when I did:

gwion · Posted: Tue Sep 23, 2003 10:48 pm Post subject: Re: /dev/pg* ? what the heck

Caffeine · Posted: Thu Sep 25, 2003 1:16 pm Post subject: Re: /dev/pg* ? what the heck

cirrus · n00b Joined: 14 Oct 2003 Posts: 18 Location: Germany

This is for people who tried every configuration one can think of including the hints from this thread and all efforts were worth nothing....

TURN OFF APIC !!!!!!

In Grub.conf insert option "noapic"
lilo?!?

Sometimes it does magic!
On my system it did.

Karsten.

ruckles · n00b Joined: 05 Nov 2003 Posts: 4

Having done all this successfully and burning audio cds no problem, is there any way to actually play the cds (using the same device, the burner on hdc)? When I use xmms and try to find the disk, /mnt/cdrom comes up empty. However, if I put a data disk in, xmms finds it.
xmms plays mp3 files fine, I just can't get it to find my audio cds.
I have the cdplayer plug-in enabled and set to device:/mnt/cdrom and dir:/mnt/cdrom
I'm told I don't need to mount audio cds.
I've tried commenting out the line in...modules.d/cdr, no luck.
I've looked all over for a solution and I am totally, completely lost.
Thanks.

guitou · Guru Joined: 02 Oct 2003 Posts: 534 Location: France

For AudioCD, you have to give the path of the device. Should be /dev/cdrom, or /dev/cdroms/cdrom[0|1], maybe also /dev/sr0 (as you enabled scsi emulation), or even /dev/ide?/host?/bus...
Only the last one is the real path of the device, then wether you give this one, wether you give one of the previous, assuming it is linked to the right device.

ruckles · n00b Joined: 05 Nov 2003 Posts: 4

Sorry, I meant to say device:/dev/cdrom.

pamplemousse · Tux's lil' helper Joined: 09 Feb 2004 Posts: 89

Hello,

On my computer, I have an IDE cdrom reader and a SCSI CDR writer. I use this post to try to use my IDE cdrom without SCSI emulator. But it didn't work for me. So I decided to go back to previous configuration, by modifying config files for another time. But now, my cdrom reader freezes when I want to mount a cdrom. And 1 or 2 min. after that, all my computer freezes. I get this from cdrecorder (after a long time scan):

Massimo B. · Posted: Tue Dec 11, 2018 7:53 am Post subject:

As of today, what is required in the kernel?

NeddySeagoon · Posted: Tue Dec 11, 2018 10:08 am Post subject:

Massimo B.

You need CONFIG_CHR_DEV_SG=y

Optical writers appear as two devices.
A character device for control and a block device for data. You need to be in the cdrom group to write optical media.
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Massimo B. · Posted: Tue Dec 11, 2018 10:12 am Post subject:

Thank you very much. The question was about xcdroast, in the meanwhile I found that k3b is working fine. Just for understanding, how can k3b work with the writer without the kernel support?
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Massimo B. · Posted: Tue Dec 11, 2018 10:39 am Post subject: