According to Mel Seder:
Hi Gilbert,
Hi Mel. I decided to post my reply to the roundtable list, in case it's of use to others too...
Can you please run those instructions by me again?
My son-in-law is running Red Hat and 8.0 and he connected a CD RW drive.
What steps do I have to take to get the drive working in linux?
First, add the following line to the /etc/modules.conf file...
alias scsi_hostadapter ide-scsi
Then, you need to build an "initrd" file for your kernel, to load the ide-scsi driver automatically on system restart. Check your kernel version number by looking in /boot for the vmlinuz-* file(s). For example, if you have a kernel called vmlinuz-2.4.18-19.7.x, you'll want a corresponding initrd file called initrd-2.4.18-19.7.x.img. (There may already be one if the installer figured you had other drivers that needed preloading.) You'd build (or rebuild) the initrd file as follows...
mkinitrd -f /boot/initrd-2.4.18-19.7.x.img 2.4.18-19.7.x
The -f option will force an existing file to be rebuilt. The next argument is the initrd file name, and the last argument is the kernel version number (so it knows which /lib/modules directory to get the modules from).
If you've got multiple kernels installed, you may want to repeat the above for each of the kernel versions you've got. Certainly, you'll want to do it for the kernel that gets booted by default.
Next, you have to tell your kernel boot loader (grub or lilo) to load that initrd file when it loads the kernel. If you're using grub (you should, as long as you're running a distribution that supports it), edit /etc/grub.conf (or /boot/grub/grub.conf, which is what /etc/grub.conf should point to), to add the following line...
initrd /boot/initrd-2.4.18-19.7.x.img
You would add that just after the kernel line for the corresponding kernel version (adjusting the kernel version as required), such as...
kernel /boot/vmlinuz-2.4.18-19.7.x ro root=/dev/hda2
(Of course, if you already had an initrd file in /boot, the grub.conf file may already mention it.)
If you're using lilo instead, edit /etc/lilo.conf to add the following line...
initrd=/boot/initrd-2.4.18-19.7.x.img
... in the section for the appropriate kernel image, then run the "lilo" command to update the lilo boot record and map file.
After that, you can reboot, and the driver should load automatically.
If you're using grub as the boot loader, there's the added advantage that anytime you upgrade your kernel, it will automatically build an updated initrd file and update the grub.conf file, so there's very little you have to worry about. With lilo, unfortunately, you'll have to repeat the lilo configuration changes above manually each time you upgrade your kernel.
According to Gilbert E. Detillieux:
According to Mel Seder:
My son-in-law is running Red Hat and 8.0 and he connected a CD RW drive.
What steps do I have to take to get the drive working in linux?
First, add the following line to the /etc/modules.conf file...
alias scsi_hostadapter ide-scsi
Then, you need to build an "initrd" file for your kernel, to load the ide-scsi driver automatically on system restart. Check your kernel version
...
Actually it doesn't need to be half that complicated. Since Red Hat 7.x, the installer automatically checks for a CD-RW drive, and if found, it will add the appropriate kernel boot command line option for enabling ide-scsi support, e.g. "hdc=ide-scsi". You can always add this manually after the fact, if the CD-RW drive is only installed later, but you need this kernel command line option whether you bother with the initrd stuff or not. In /etc/grub/grub.conf, you just add it to the kernel command line. If you use LILO, you have to add it via an append="hdc=ide-scsi" line in /etc/lilo.conf, and then rerun "lilo".
The initrd stuff isn't needed, though. All that's needed is for the /etc/rc.d/* files to do the necessary modprobes to load the ide-scsi drivers. Red Hat 7 & 8 do this with the following commands in rc.sysinit:
# If they asked for ide-scsi, load it if grep -q "ide-scsi" /proc/cmdline ; then modprobe ide-cd >/dev/null 2>&1 modprobe ide-scsi >/dev/null 2>&1 fi
For Red Hat 6, you can just add these to rc.local. The line in /etc/modules.conf is only needed if you make the initrd.
The other thing you may want to do is update the /dev/cdrom symlink so it points to the new device (usually scd0) rather than hdc or hdd:
ln -fs scd0 /dev/cdrom
If your system has both CD-ROM and CD-RW drives, it's just slightly more complicated. With the older 2.2 kernels, if ide-scsi remapped the CD-RW drive, it remapped the CD-ROM drive too, regardless of whether you indicated both drive mappings on the kernel command line. I don't know if that's still the case in 2.4, but I don't think it hurts to do that too. Generally the CD-RW should be the master (hdc) and will be mapped to scd0, while the CD-ROM as slave (hdd) will be mapped to scd1.
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gedetil＠cs.umanitoba.ca -
Gilles Detillieux