[gentoo-user] /dev/cdrom has gone!

[gentoo-user] /dev/cdrom has gone!

[danielhf]

i upgrade my system to use udev instead of previously known 
devfs, and leave the devfs option blank while configure the 
kernel, but recently, i found i could not mount my cdrom, 
there is no such device at all! the /dev/cdrom and the like has
gone! 
  
i test with my usb disk, and the /dev/ directory could add and 
remove the sda1 device node accordingly, it seems that everything
goes well. but where is my cdrom?

i have changed the /etc/conf.d/rc, and replace
RC_DEVICE_TARBALL="yes" with
RC_DEVICE_TARBALL="no"  several days ago,
because i think that'll be ok for me, and everything seems working
with the exception of the cdrom i found today! 

the rule file under the etc/udev/rules.d/ makes no sense to me,

any ideas please, thanks a lot.

---------------------------------
daniel

-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] /dev/cdrom has gone!

[Holly Bostick]

danielhf@21cn.com schreef:
> i upgrade my system to use udev instead of previously known devfs, 
> and leave the devfs option blank while configure the kernel, but 
> recently, i found i could not mount my cdrom, there is no such device
>  at all! the /dev/cdrom and the like has gone!
> 
> i test with my usb disk, and the /dev/ directory could add and remove
>  the sda1 device node accordingly, it seems that everything goes 
> well. but where is my cdrom?
> 
> i have changed the /etc/conf.d/rc, and replace 
> RC_DEVICE_TARBALL="yes" with RC_DEVICE_TARBALL="no"  several days 
> ago, because i think that'll be ok for me, and everything seems 
> working with the exception of the cdrom i found today!
> 
> the rule file under the etc/udev/rules.d/ makes no sense to me,
> 
> any ideas please, thanks a lot.

/dev/cdrom (or in my case, /dev/cdrom, /dev/cdrw, and /dev/dvd) are just
symlinks to the real device anyway.

The real device is hd* (in my case, 'hdc', because the CD/DVD drive is the
master on the second IDE channel, as my hard drive is hda because it's
master on the first channel).

So maybe try looking for the actual device, instead of a symlink (which
has apparently been removed), and see if that gets you any further.

HTH,
Holly
-- 
gentoo-user@gentoo.org mailing list

[gentoo-user] Re: /dev/cdrom has gone!

[Sven Köhler]

[-- Attachment #1: Type: text/plain, Size: 142 bytes --]

> unfortunetly, hdc does not exist either.
> and dmesg does not show anything about my
> cdrom or hdc. just odd.

how about modprobe ide-cd ?

[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 253 bytes --]

[gentoo-user] Re: /dev/cdrom has gone!

[Sven Köhler]

[-- Attachment #1: Type: text/plain, Size: 142 bytes --]

> unfortunetly, hdc does not exist either.
> and dmesg does not show anything about my
> cdrom or hdc. just odd.

how about modprobe ide-cd ?

[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 253 bytes --]

Re: [gentoo-user] /dev/cdrom has gone!

[danielhf]

unfortunetly, hdc does not exist either.
and dmesg does not show anything about my
cdrom or hdc. just odd.

On Sat, Sep 03, 2005 at 12:36:49PM +0200, Holly Bostick wrote:
> danielhf@21cn.com schreef:
> > i upgrade my system to use udev instead of previously known devfs, 
> > and leave the devfs option blank while configure the kernel, but 
> > recently, i found i could not mount my cdrom, there is no such device
> >  at all! the /dev/cdrom and the like has gone!
> > 
> > i test with my usb disk, and the /dev/ directory could add and remove
> >  the sda1 device node accordingly, it seems that everything goes 
> > well. but where is my cdrom?
> > 
> > i have changed the /etc/conf.d/rc, and replace 
> > RC_DEVICE_TARBALL="yes" with RC_DEVICE_TARBALL="no"  several days 
> > ago, because i think that'll be ok for me, and everything seems 
> > working with the exception of the cdrom i found today!
> > 
> > the rule file under the etc/udev/rules.d/ makes no sense to me,
> > 
> > any ideas please, thanks a lot.
> 
> /dev/cdrom (or in my case, /dev/cdrom, /dev/cdrw, and /dev/dvd) are just
> symlinks to the real device anyway.
> 
> The real device is hd* (in my case, 'hdc', because the CD/DVD drive is the
> master on the second IDE channel, as my hard drive is hda because it's
> master on the first channel).
> 
> So maybe try looking for the actual device, instead of a symlink (which
> has apparently been removed), and see if that gets you any further.
> 
> HTH,
> Holly
> -- 
> gentoo-user@gentoo.org mailing list
> 
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[danielhf]

On Sat, Sep 03, 2005 at 02:07:34PM +0200, Sven K?hler wrote:

i alway build it into kernel, i already checked my config file,
the "BLK_DEV_IDECD=y" is just there.

besides, why there is a register dump while i reboot,
the error occures at /etc/init.d/halt.sh right
after "Unmounting filesystems".  hehe ;-(. broken...

> > unfortunetly, hdc does not exist either.
> > and dmesg does not show anything about my
> > cdrom or hdc. just odd.
> 
> how about modprobe ide-cd ?


-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[danielhf]

On Sat, Sep 03, 2005 at 08:32:56PM +0800, danielhf@21cn.com wrote:

no error on reboot now, but i will try to switch to windows to see
if the cdrom works well....

> On Sat, Sep 03, 2005 at 02:07:34PM +0200, Sven K?hler wrote:
> 
> i alway build it into kernel, i already checked my config file,
> the "BLK_DEV_IDECD=y" is just there.
> 
> besides, why there is a register dump while i reboot,
> the error occures at /etc/init.d/halt.sh right
> after "Unmounting filesystems".  hehe ;-(. broken...
> 
> > > unfortunetly, hdc does not exist either.
> > > and dmesg does not show anything about my
> > > cdrom or hdc. just odd.
> > 
> > how about modprobe ide-cd ?
> 
> 
> -- 
> gentoo-user@gentoo.org mailing list
> 
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[Alex Korshunov]

danielhf@21cn.com wrote:

>On Sat, Sep 03, 2005 at 08:32:56PM +0800, danielhf@21cn.com wrote:
>
>no error on reboot now, but i will try to switch to windows to see
>if the cdrom works well....
>  
>
All my cdroms in /dev/cdroms/cdrom. May be...?

-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[Matt Randolph]

Alex Korshunov wrote:

> danielhf@21cn.com wrote:
>
>> On Sat, Sep 03, 2005 at 08:32:56PM +0800, danielhf@21cn.com wrote:
>>
>> no error on reboot now, but i will try to switch to windows to see
>> if the cdrom works well....
>>  
>>
> All my cdroms in /dev/cdroms/cdrom. May be...?
>

I didn't see the beginning of this thread so my question may be 
redundant.  Did you (the OP) verify that the drive is still detected by 
the BIOS?

-- 

"Pluralitas non est ponenda sine necessitate" - W. of O.

-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[danielhf]

my BIOS infomation shows my cdrom is at the third IDE primary,
so i do:
mknod -m 660 hde b 33 0

and later i tried
mknod -m 660 hdc b 23 0

the output:
hdc is not a valid block device

no luck. hde failed either, i give it up. ;-( 

thanks for all help.

daniel

On Sat, Sep 03, 2005 at 04:53:57PM +0400, Alex Korshunov wrote:
> danielhf@21cn.com wrote:
> 
> >On Sat, Sep 03, 2005 at 08:32:56PM +0800, danielhf@21cn.com wrote:
> >
> >no error on reboot now, but i will try to switch to windows to see
> >if the cdrom works well....
> > 
> >
> All my cdroms in /dev/cdroms/cdrom. May be...?
> 
> -- 
> gentoo-user@gentoo.org mailing list
> 
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[danielhf]

yes, it works just well in WindowsXP.
it even works before i use udev. hehe

i'm not sure it failed due to the udev, 
i have no idea now.

On Sat, Sep 03, 2005 at 09:20:42AM -0400, Matt Randolph wrote:
> Alex Korshunov wrote:
> 
> >danielhf@21cn.com wrote:
> >
> >>On Sat, Sep 03, 2005 at 08:32:56PM +0800, danielhf@21cn.com wrote:
> >>
> >>no error on reboot now, but i will try to switch to windows to see
> >>if the cdrom works well....
> >> 
> >>
> >All my cdroms in /dev/cdroms/cdrom. May be...?
> >
> 
> I didn't see the beginning of this thread so my question may be 
> redundant.  Did you (the OP) verify that the drive is still detected by 
> the BIOS?
> 
> -- 
> 
> "Pluralitas non est ponenda sine necessitate" - W. of O.
> 
> -- 
> gentoo-user@gentoo.org mailing list
> 
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[John Jolet]

On Saturday 03 September 2005 08:20, Matt Randolph wrote:
> Alex Korshunov wrote:
> > danielhf@21cn.com wrote:
> >> On Sat, Sep 03, 2005 at 08:32:56PM +0800, danielhf@21cn.com wrote:
> >>
> >> no error on reboot now, but i will try to switch to windows to see
> >> if the cdrom works well....
> >
> > All my cdroms in /dev/cdroms/cdrom. May be...?
>
> I didn't see the beginning of this thread so my question may be
> redundant.  Did you (the OP) verify that the drive is still detected by
> the BIOS?
having done some research yesterday on udev, specifically the gentoo udev 
howto, it was my understanding that udev did NOT create node files.  those 
must exist and udev just manages the mappings to those files.  that's what 
the tar/untar process on shutdown/boot takes care of.  devfs, on the other 
hand DID take care of those files.  the gentoo udev howto specifically gives 
a walkthrough on the steps necessary to switch from a hybrid udev/devfs 
system to a pure udev system.  Have you looked at that document?  
Unfortunately, I don't remember the link at this moment, but I linked to it 
from the udev stuff at kernel.org.
-- 
John Jolet
Your On-Demand IT Department
512-762-0729
www.jolet.net
john@jolet.net
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[danielhf]

i did read that document, to find the doc is trivial.

what i got is just similar. the udev just create the device
files which were detected by kernel, and handle the operations
like add or remove dynamically. i tried this feature with my usb
devices already, i really like the way udev works. i could not found
any info from the output of dmesg, so i think perhaps there is a problem
on detecting the device, but not the problem of udev.

thanks

daniel

On Sat, Sep 03, 2005 at 08:40:20AM -0500, John Jolet wrote:
> On Saturday 03 September 2005 08:20, Matt Randolph wrote:
> > Alex Korshunov wrote:
> > > danielhf@21cn.com wrote:
> > >> On Sat, Sep 03, 2005 at 08:32:56PM +0800, danielhf@21cn.com wrote:
> > >>
> > >> no error on reboot now, but i will try to switch to windows to see
> > >> if the cdrom works well....
> > >
> > > All my cdroms in /dev/cdroms/cdrom. May be...?
> >
> > I didn't see the beginning of this thread so my question may be
> > redundant.  Did you (the OP) verify that the drive is still detected by
> > the BIOS?
> having done some research yesterday on udev, specifically the gentoo udev 
> howto, it was my understanding that udev did NOT create node files.  those 
> must exist and udev just manages the mappings to those files.  that's what 
> the tar/untar process on shutdown/boot takes care of.  devfs, on the other 
> hand DID take care of those files.  the gentoo udev howto specifically gives 
> a walkthrough on the steps necessary to switch from a hybrid udev/devfs 
> system to a pure udev system.  Have you looked at that document?  
> Unfortunately, I don't remember the link at this moment, but I linked to it 
> from the udev stuff at kernel.org.
> -- 
> John Jolet
> Your On-Demand IT Department
> 512-762-0729
> www.jolet.net
> john@jolet.net
> -- 
> gentoo-user@gentoo.org mailing list
> 
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[Philip Webb]

050903 danielhf@21cn.com wrote:
> my BIOS infomation shows my cdrom is at the third IDE primary,
> so i do: 'mknod -m 660 hde b 33 0' ...

What happened in that case ?  That ought to be what you want.

> ... and later i tried 'mknod -m 660 hdc b 23 0'
> the output: "hdc is not a valid block device"

I changed over a couple of days ago & have the correct devices in  /dev .
Are you using an upto-date kernel ( 2.6.12-gentoo-r<nn> ) ?

-- 
========================,,============================================
SUPPORT     ___________//___,  Philip Webb : purslow@chass.utoronto.ca
ELECTRIC   /] [] [] [] [] []|  Centre for Urban & Community Studies
TRANSIT    `-O----------O---'  University of Toronto
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[Daniel Drake]

danielhf@21cn.com wrote:
> i alway build it into kernel, i already checked my config file,
> the "BLK_DEV_IDECD=y" is just there.

Are you really really sure? What do you have in /sys/bus/ide/drivers ?

Daniel
-- 
gentoo-user@gentoo.org mailing list

[gentoo-user] Re: /dev/cdrom has gone!

[Greg Yasko]

On Sat, 03 Sep 2005 18:19:37 +0800, danielhf wrote:

> i upgrade my system to use udev instead of previously known 
> devfs, and leave the devfs option blank while configure the 
> kernel, but recently, i found i could not mount my cdrom, 
> there is no such device at all! the /dev/cdrom and the like has
> gone! 
>   
> any ideas please, thanks a lot.
> 
> ---------------------------------
> daniel

I had the same problem several months ago when I upgraded to the 2.6
kernel and udev.

Just boot off the livecd, mount the / partition and delete .devfsd from
the /dev directory. That should do it.

Hope this helps.

-G.Y.

-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[danielhf]

there are two items there:
ide-cdrom & ide-disk
but just empty directories. ??

On Sat, Sep 03, 2005 at 06:45:21PM +0100, Daniel Drake wrote:
> danielhf@21cn.com wrote:
> >i alway build it into kernel, i already checked my config file,
> >the "BLK_DEV_IDECD=y" is just there.
> 
> Are you really really sure? What do you have in /sys/bus/ide/drivers ?
> 
> Daniel
> -- 
> gentoo-user@gentoo.org mailing list
> 
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[danielhf]

i discover a something while examine my dmesg output.

-->Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
-->ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
-->Probing IDE interface ide0...
-->hda: ST380817AS, ATA DISK drive
-->Probing IDE interface ide1...
-->Probing IDE interface ide2...
-->Probing IDE interface ide3... <--- there should be a cdrom detected here
-->Probing IDE interface ide4...
-->Probing IDE interface ide5...
-->ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
-->hda: max request size: 1024KiB
-->hda: 156301488 sectors (80026 MB) w/8192KiB Cache, CHS=16383/255/63
-->hda: cache flushes supported
--> hda: hda1 hda2 < hda5 hda6 hda7 hda8 hda9 hda10 hda11 hda12 hda13 >

now, maybe i can say it's a problem of detecting my driver for sure?

there have been a lot of problems around since i use a SATA hard drive,
and a common ATA cdrom, i spent a lot of time to find out the right CMOS
configuration:

P-ATA only | S-ATA only | P-ATA & S-ATA etc and some others. 
i use a Native Mode, so that my disk can be recognized as /dev/hdaXX
instead of /dev/sdaXX. and P-ATA only but with S-ATA enabled.

is there any advice on how to config such stuff correctly?
WindowsXP works with them just perfectly, and it's ok on my gentoo box
before the udev comes out maybe. i remember...

many thanks
daniel

On Sat, Sep 03, 2005 at 06:45:21PM +0100, Daniel Drake wrote:
> danielhf@21cn.com wrote:
> >i alway build it into kernel, i already checked my config file,
> >the "BLK_DEV_IDECD=y" is just there.
> 
> Are you really really sure? What do you have in /sys/bus/ide/drivers ?
> 
> Daniel
> -- 
> gentoo-user@gentoo.org mailing list
> 
-- 
gentoo-user@gentoo.org mailing list

[gentoo-user] Re: /dev/cdrom has gone!

[Sven Köhler]

[-- Attachment #1: Type: text/plain, Size: 381 bytes --]

> P-ATA only | S-ATA only | P-ATA & S-ATA etc and some others. 
> i use a Native Mode, so that my disk can be recognized as /dev/hdaXX
> instead of /dev/sdaXX. and P-ATA only but with S-ATA enabled.

What's wrong about /dev/sdaX ? That's exactly how it should be. So
disable that strange "native-mode" and instead enable the SATA driver in
the SCSCI-driver section of your kernel.

[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 253 bytes --]

[gentoo-user] Re: Re: /dev/cdrom has gone!

[Greg Yasko]

> yes, it works just well in WindowsXP.
> it even works before i use udev. hehe
> 
> i'm not sure it failed due to the udev, 
> i have no idea now.

I had the exact same problem when switching to the 2.6 kernel and udev
several months ago. After deleting .devfsd from the devices directory my
CD burner was properly detected upon reboot, and the directory was
populated with devices that were missing. There was a line in dmesg about
.devfsd blocking at startup.

Is .devfsd in your /dev directory? Run an "ls -al /dev | grep devfsd". If
so, boot off a livecd and delete the file. Be sure that you aren't using a
hybrid of devfs and udev before doing this.






-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[danielhf]

thanks to all...

i finally get the cdrom work, not perfectly though, i change
the BIOS setting that use S-ATA only instead and keep P-ATA
enabled, which makes cdrom the primary 1st, the sata drive 
recognized as primary third. (i hate such layout !! i prefer 
the hard disk to be the primary first and recognized as hda).

at last, the sata drive was recognized as sda, so that's the
whole story, 

now i'm wondering what on earth are the changes made with those
BIOS settings, and how it affect the kernel? (because whatever i
configure, the M$ Windows just works perfectly). 

i would not think the problem solved already, i'll take a look at
this later.

thanks again.
daniel

On Sat, Sep 03, 2005 at 02:35:51PM -0400, Greg Yasko wrote:
> On Sat, 03 Sep 2005 18:19:37 +0800, danielhf wrote:
> 
> > i upgrade my system to use udev instead of previously known 
> > devfs, and leave the devfs option blank while configure the 
> > kernel, but recently, i found i could not mount my cdrom, 
> > there is no such device at all! the /dev/cdrom and the like has
> > gone! 
> >   
> > any ideas please, thanks a lot.
> > 
> > ---------------------------------
> > daniel
> 
> I had the same problem several months ago when I upgraded to the 2.6
> kernel and udev.
> 
> Just boot off the livecd, mount the / partition and delete .devfsd from
> the /dev directory. That should do it.
> 
> Hope this helps.
> 
> -G.Y.
> 
> -- 
> gentoo-user@gentoo.org mailing list
> 
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[Robert Crawford]

On Monday 05 September 2005 09:56 am, danielhf@21cn.com wrote:
> thanks to all...
>
> i finally get the cdrom work, not perfectly though, i change
> the BIOS setting that use S-ATA only instead and keep P-ATA
> enabled, which makes cdrom the primary 1st, the sata drive
> recognized as primary third. (i hate such layout !! i prefer
> the hard disk to be the primary first and recognized as hda).
>
> at last, the sata drive was recognized as sda, so that's the
> whole story,
>
> now i'm wondering what on earth are the changes made with those
> BIOS settings, and how it affect the kernel? (because whatever i
> configure, the M$ Windows just works perfectly).
>
> i would not think the problem solved already, i'll take a look at
> this later.
>
> thanks again.
> daniel
>
> On Sat, Sep 03, 2005 at 02:35:51PM -0400, Greg Yasko wrote:
> > On Sat, 03 Sep 2005 18:19:37 +0800, danielhf wrote:
> > > i upgrade my system to use udev instead of previously known
> > > devfs, and leave the devfs option blank while configure the
> > > kernel, but recently, i found i could not mount my cdrom,
> > > there is no such device at all! the /dev/cdrom and the like has
> > > gone!
> > >
> > > any ideas please, thanks a lot.
> > >
> > > ---------------------------------
> > > daniel
> >
> > I had the same problem several months ago when I upgraded to the 2.6
> > kernel and udev.
> >
> > Just boot off the livecd, mount the / partition and delete .devfsd from
> > the /dev directory. That should do it.
> >
> > Hope this helps.
> >
> > -G.Y.

I just had a similar problem after I updated udev (I think). I run ~x86 
systems, always kept current, so I expect a few minor hiccups, even though 
I'm extremely careful  with etc-update. There seems to be some weird stuff 
going on with udev, at least on my system, but after a lot of reading on the 
formum, and trying many things, I tried changing my fstab line

/dev/cdroms/cdrom0	/mnt/cdrom	iso9660		noauto,rw,user		0 0

to this.

/dev/hdc 	/mnt/cdrom	iso9660		noauto,rw,user		0 0

I think some rule in the new udev changed, and it wasn't creating cdroms and 
cdrom0 anymore- only /dev/hdc.

I looked in /dev, and sure enough, the cdrom and cdrw links point to the hdc 
block device.

Anyway, whatever it was, changing the fstab line now lets me mount cdroms 
normally, as before.

Robert Crawford
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[Steve Evans]

On Monday 05 Sep 2005 15:31, Robert Crawford wrote:
> I just had a similar problem after I updated udev (I think). I run ~x86
> systems, always kept current, so I expect a few minor hiccups, even though
> I'm extremely careful  with etc-update. There seems to be some weird stuff
> going on with udev, at least on my system, but after a lot of reading on
> the formum, and trying many things, I tried changing my fstab line
>
> /dev/cdroms/cdrom0	/mnt/cdrom	iso9660		noauto,rw,user		0 0
>
> to this.
>
> /dev/hdc 	/mnt/cdrom	iso9660		noauto,rw,user		0 0
>
> I think some rule in the new udev changed, and it wasn't creating cdroms
> and cdrom0 anymore- only /dev/hdc.
>
> I looked in /dev, and sure enough, the cdrom and cdrw links point to the
> hdc block device.
>
> Anyway, whatever it was, changing the fstab line now lets me mount cdroms
> normally, as before.
>
> Robert Crawford

I assume that as you are running ~x86 you have upgraded to gentoo-sources 
version 2.6.13. In that version devfs has been removed (well the config 
option has gone, the code is still there). The /dev/cdroms/cdrom0 style of 
device file name is a part of devfs, so if with earlier kernels you still had 
devfs enabled in the kernel, despite running udev, then you would have gotten 
the /dev/cdroms/cdrom0 link.

I am running x86 and running with udev but with devfs still in the kernel. 
Yesterday I disabled devfs on one of the machines so that I could see what 
would break in preparation for 2.6.13 moving to x86. I experienced exactly 
your problem of /dev/cdroms/cdrom0 disappearing. Fortunately the solution is 
simple, as you describe above.

Steve
-- 
____________________________________________________________________
Steve Evans            E-mail: mailto:stevee@gorbag.com
                       WEB:    http://www.gorbag.com
Registered Linux user #217906: http://counter.li.org
Public Encryption Key:         http://www.gorbag.com/public-key.html
____________________________________________________________________

-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[Robert Crawford]

On Monday 05 September 2005 10:51 am, Steve Evans wrote:
> On Monday 05 Sep 2005 15:31, Robert Crawford wrote:
> > I just had a similar problem after I updated udev (I think). I run ~x86
> > systems, always kept current, so I expect a few minor hiccups, even
> > though I'm extremely careful  with etc-update. There seems to be some
> > weird stuff going on with udev, at least on my system, but after a lot of
> > reading on the formum, and trying many things, I tried changing my fstab
> > line
> >
> > /dev/cdroms/cdrom0	/mnt/cdrom	iso9660		noauto,rw,user		0 0
> >
> > to this.
> >
> > /dev/hdc 	/mnt/cdrom	iso9660		noauto,rw,user		0 0
> >
> > I think some rule in the new udev changed, and it wasn't creating cdroms
> > and cdrom0 anymore- only /dev/hdc.
> >
> > I looked in /dev, and sure enough, the cdrom and cdrw links point to the
> > hdc block device.
> >
> > Anyway, whatever it was, changing the fstab line now lets me mount cdroms
> > normally, as before.
> >
> > Robert Crawford
>
> I assume that as you are running ~x86 you have upgraded to gentoo-sources
> version 2.6.13. In that version devfs has been removed (well the config
> option has gone, the code is still there). The /dev/cdroms/cdrom0 style of
> device file name is a part of devfs, so if with earlier kernels you still
> had devfs enabled in the kernel, despite running udev, then you would have
> gotten the /dev/cdroms/cdrom0 link.
>
> I am running x86 and running with udev but with devfs still in the kernel.
> Yesterday I disabled devfs on one of the machines so that I could see what
> would break in preparation for 2.6.13 moving to x86. I experienced exactly
> your problem of /dev/cdroms/cdrom0 disappearing. Fortunately the solution
> is simple, as you describe above.
>
> Steve
> --
> ____________________________________________________________________
> Steve Evans            E-mail: mailto:stevee@gorbag.com
>                        WEB:    http://www.gorbag.com
> Registered Linux user #217906: http://counter.li.org
> Public Encryption Key:         http://www.gorbag.com/public-key.html
> ____________________________________________________________________

Steve,
What you say makes perfect sense, but I'm still not sure I have an 
understanding of what has changed. I always compile my own kernels from 
vanilla, and patches, so I haven't used gentoo-sources in at least 2 years. 
My  current kernel is 2.6.13-gvivid (based on 2.6.13 final), which works 
great, and is where I first noticed this cdrom problem. I did notice that 
devfs had finally been removed.

However, when I boot with other previous kernels (2.6.12.x- vivid and nitro, 
and 2.6.12.3 vanilla),  the problem remains. This leads me to believe that 
somehow it's the newest udev version causing and some kind of compatibility 
issue with recent kernels. I haven't investigated this much, but it didn't 
happen with the previous udev version.

Anyway, for now I'm content with the fstab hdc edit resolution, and happy to 
be rid of devfs..

Robert
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Re: /dev/cdrom has gone!

[Robert Crawford]

Page 5-6 of a long udev thread is good reading on recent udev problems.

Robert
http://forums.gentoo.org/viewtopic-t-355069-postdays-0-postorder-asc-start-100.html


On Monday 05 September 2005 10:51 am, Steve Evans wrote:
> On Monday 05 Sep 2005 15:31, Robert Crawford wrote:
> > I just had a similar problem after I updated udev (I think). I run ~x86
> > systems, always kept current, so I expect a few minor hiccups, even
> > though I'm extremely careful  with etc-update. There seems to be some
> > weird stuff going on with udev, at least on my system, but after a lot of
> > reading on the formum, and trying many things, I tried changing my fstab
> > line
> >
> > /dev/cdroms/cdrom0	/mnt/cdrom	iso9660		noauto,rw,user		0 0
> >
> > to this.
> >
> > /dev/hdc 	/mnt/cdrom	iso9660		noauto,rw,user		0 0
> >
> > I think some rule in the new udev changed, and it wasn't creating cdroms
> > and cdrom0 anymore- only /dev/hdc.
> >
> > I looked in /dev, and sure enough, the cdrom and cdrw links point to the
> > hdc block device.
> >
> > Anyway, whatever it was, changing the fstab line now lets me mount cdroms
> > normally, as before.
> >
> > Robert Crawford
>
> I assume that as you are running ~x86 you have upgraded to gentoo-sources
> version 2.6.13. In that version devfs has been removed (well the config
> option has gone, the code is still there). The /dev/cdroms/cdrom0 style of
> device file name is a part of devfs, so if with earlier kernels you still
> had devfs enabled in the kernel, despite running udev, then you would have
> gotten the /dev/cdroms/cdrom0 link.
>
> I am running x86 and running with udev but with devfs still in the kernel.
> Yesterday I disabled devfs on one of the machines so that I could see what
> would break in preparation for 2.6.13 moving to x86. I experienced exactly
> your problem of /dev/cdroms/cdrom0 disappearing. Fortunately the solution
> is simple, as you describe above.
>
> Steve
> --
> ____________________________________________________________________
> Steve Evans            E-mail: mailto:stevee@gorbag.com
>                        WEB:    http://www.gorbag.com
> Registered Linux user #217906: http://counter.li.org
> Public Encryption Key:         http://www.gorbag.com/public-key.html
> ____________________________________________________________________
-- 
gentoo-user@gentoo.org mailing list