hi everyone,

i have an ide cd writer + dvd rom drive.
i have the following compiled (m for module, * for in-kernel)

(*) include ide/atapi cdrom support
(m) scsi emulation support
(*) scsi support
(m) scsi cd-rom support
(*) enable vendor-specific extensions
(m) scsi generic support

i have set the modules i compiled to load in /etc/rc.d/rc.modules

since dmesg |grep hdc + hdd show me:

ide1: BM-DMA at 0xb808-0xb80f, BIOS settings: hdc:DMA, hdd:DMA
hdc: Pioneer DVD-ROM ATAPIModel DVD-106S 012, ATAPI CD/DVD-ROM drive
hdd: PLEXTOR CD-R PX-W1610A, ATAPI CD/DVD-ROM drive
hdc: attached ide-cdrom driver.
hdc: ATAPI 40X DVD-ROM drive, 256kB Cache, UDMA(33)
hdd: attached ide-cdrom driver.
hdd: ATAPI 40X CD-ROM CD-R/RW drive, 2048kB Cache, UDMA(33)

i have added 'append="hdd=ide-scsi" to /etc/lilo.conf and
ran lilo to have the changes added to the boot loader.

my fstab is a mess, i have deleted /dev/hdd, /dev/scd0 and
some others because i believed them to be symlinks, but i was
not sure.. so i might have messed up there.

the entries i have there now are the following:

/dev/dvd /mnt/cdrom iso9660 noauto,users,ro 0 0
/dev/hdd /mnt/cdrom2 iso9660 noauto,users,ro 0 0

(the rest of the lines do not concern the dvd-rom + cdrw)

when i run totem as root i can select both my dvd-rom and my
cdrw as devices, though as normal user it says in the console that
/dev/hdc can not be accessed - what's up with that?

cdrecord -scanbus gives me the following:

Cdrecord 2.00.3 (i686-pc-linux-gnu) Copyright (C) 1995-2002 Jörg Schilling
cdrecord: Permission denied. Cannot open '/dev/sg1'. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.

i tried searching through these forums and others (also the gentoo
forums), and used google. i found no way to fix my problem, and
i've spent over six hours trying to do so.

any suggestions are greatly appreciated and should i provide more
info, do not hesitate to ask.

kind regards.

edited
Your /etc/fstab should look similar to mine
/dev/dvdrom /mnt/dvdrom iso9660 noauto,owner,ro 0 0
/dev/cdrom /mnt/cdrom iso9660 noauto,owner,ro 0 0
The line /dev/hdd /mnt/cdrom2 iso9660 noauto,users,ro 0 0 does not belong in your /etc/fstab file( replace it with the /dev/cdrom).
/dev/dvdrom should be linked to /dev/hdc and /dev/cdrom should be linked to /dev/hdd. ln -s /dev/hdc /dev/dvdrom and ln -s /dev/hdd /dev/cdrom.
Both will need mount points as well. mkdir /mnt/dvdrom and mkdir /mnt/cdrom.

i changed my settings to match yours, though
my cdrecord -scanbus output remains unchanged.

Have you tried burning a cd?
Were you root?

i was root, and it keeps saying it can not
open /dev/sg1, etc, as stated above.

This may be more helpful than me.
http://www.icon.co.za/~psheer/book/n...00000000000000
You may have to scroll up a bit. It's section 42.6.11 CD writers.
Also http://www.ibiblio.org/pub/Linux/doc...-Writing-HOWTO

after a lot of messing around i have the following set:

/dev/dvd /mnt/dvd iso9660 noauto,users,ro 0 0
/dev/sr0 /mnt/cdrom iso9660 noauto,users,ro 0 0

i can mount /mnt/dvd and /mnt/cdrom without problems,
but cdrecord -scanbus still gives the following:

cdrecord: Permission denied. Cannot open '/dev/sg0'. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'

all in all, thank you for your prompt replies, i will try more tomorrow.

nite.

Try booting the stock kernel and running cdrecord -scanbus.

Are the SCSI modules loading? check with lsmod

Its not an fstab problem.

Do you have a /dev/sg1? If you do what are its permissions.

wut r /dev/dvd and /dev/sr0 pointing to? u should change them to cdrom1 and cdrom2 or dvd and cdrom. they should point to /dev/scd0 and /dev/scd1. do ls -l /dev/dvd and ls -l /dev/sr0 to find out wut they're pointing to. then use ln -s to create your links pointing to scd0 and scd1. if u deleted scd0 recreate it. it's not a link it's the scsi device.

also u have 2 drives, so that's hdc and hdd. in lilo, u want append="hdc=scsi hdd=scsi" ive seen hdc=ide-scsi on a lot of guides but wut i wrote above works for me. give both a try, may not even matter. then do cdrecord -scanbus after all this c if it works. hope it does.......

oh damn u deleted /dev/hdd too..... put that back.

quietguy,

i will not use a stock kernel, i've worked hard
enough to make myself a custom one and it should work
fine as well.


michaelk,

here is my lsmod output relating to scsi/cdrom modules:

sg 28556 0
sr_mod 15928 0
ide-scsi 11440 0
scsi_mod 62292 3 [sg sr_mod ide-scsi]
ide-cd 34440 0
cdrom 32224 0 [sr_mod ide-cd]

yesterday i re-created /dev/sg*, they are now as follows:

crw-r--r-- 1 root root 21, 0 Jul 29 00:15 /dev/sg0
crw-r--r-- 1 root root 21, 1 Jul 29 00:15 /dev/sg1
crw-r--r-- 1 root root 21, 2 Jul 29 00:15 /dev/sg2
crw-r--r-- 1 root root 21, 3 Jul 29 00:15 /dev/sg3
crw-r--r-- 1 root root 21, 4 Jul 29 00:15 /dev/sg4
crw-r--r-- 1 root root 21, 5 Jul 29 00:15 /dev/sg5
crw-r--r-- 1 root root 21, 6 Jul 29 00:15 /dev/sg6
crw-r--r-- 1 root root 21, 7 Jul 29 00:15 /dev/sg7


eltongeoff,

i can mount both the dvd-rom drive and my cdrw drive. can
you please enlighten me to why i should change the symlinks
and my /etc/fstab to something which would not even
allow mounting? as far as i can see my fstab is proper, it's
'just' the matter of getting /dev/sg* to have the right
permissions.

thank you all for your input, i will try to find more possible
solutions today.

ok.. i did a simple

chmod 660 /dev/sg*

and now cdercord -scanbus shows my cdrw drive.

though this is great, now i have another problem.

how do i enable dma for my cdrw drive?

i tried hdparm -i /dev/hdd, /dev/sr0 , but it tells me
that hdparm does not support those devices.

as far as i know i need dma, or else i will be forced to
hardly touch my pc when i am burning something to
prevent it from creating a coaster.


and ofcourse the problem which i found when trying
to run totem as normal user remains:

** (totem:12638): WARNING **: Couldn't read /proc/sys/dev/cdrom/info
libdvdnav: Using dvdnav version 1-beta12 from http://xine.sf.net
libdvdread: Using libdvdcss version 1.2.6 for DVD access
libdvdread: Could not open /dev/hdc with libdvdcss.
libdvdread: Can't open /dev/hdc for reading
libdvdnav: vm: faild to open/read the DVD

as root it works fine.

suggestions are very welcome.

A few suggestions here, then I'll get onto a response

I prefer to compile SCSI support INTO the kernel versus module, mainly because is there ANY point where you don't wanna use your burner as a burner, and have a problem making it work otherwise (as a scd device?), not likely. All those extra modules are unnecessary 'clutter' to me

Ok, so now how to use hdparm on a scsi emulated device. The device you are emulating.

Let's say your burner is /dev/hdc and you are emulating scsi on that device to make it /dev/scd1 then you will:
/sbin/hdparm -Tt /dev/hdc
Or whatever device/options you want. They will apply to the scsi device

Cool

ok. thank you for your reply, but as i stated before,
when i try to use hdparm on /dev/hdd it says it is not
supported. i will recompile my kernel now to have
support for scsi + emulation instead of compiling them
as modules.

i will report back with any changes.

reporting back - i compiled all scsi + ide cd modules into
the kernel, but now cdrecord reports the following:

Cdrecord 2.00.3 (i686-pc-linux-gnu) Copyright (C) 1995-2002 Jörg Schilling
cdrecord: No such file or directory. Cannot open '/dev/pg*'. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.

so the mess is back. i'll try figuring out how to fix it :|


*update*


changed it back to modules instead of in-kernel stuff; now
cdrecord-scanbus works again and mounting works. the totem +
dma problems remain.