rpjday wrote:
> sigh. of course, you're right. but rather than have this in
> /etc/lilo.conf, i have the following lines in /etc/conf.modules:
>
> alias scd0 sr_mod
> alias scsi_hostadapter ide-scsi
> options ide-cd ignore=hdc
AFAIK, that will only work if your kernel was built with ATAPI CDROM
support compiled as a module, which Red Hat's kernels are not. Most
people don't want to spend the time to recompile their kernel, so that
won't work for them.
> (in fact, the last of these three lines is optional -- it still works
> without that line.)
What does `cat /proc/cmdline` tell you? My guess is that it still has
"hdc=ide-scsi" in there.
> i can't recall where i read that these lines would solve the
> problem. anyone want to supply a breakdown of the rationale for
> the above?
Under Red Hat's kernel configuration, the kernel has built-in support
for ATAPI CDROMs. When the kernel loads, it recognises ATAPI CD drives,
and assigns the ATAPI CDROM driver to them. When you load the ide-scsi
module, it finds no drives that are without a driver, and does not
assume control of drives that already have a driver. In this
configuration, you have to give the kernel a command line option that
tells it _not_ to assign the drive a driver. Having added
"hdc=ide-scsi" to lilo.conf, and run lilo, the kernel will no longer
attempt to assign the ATAPI CDROM driver to hdc. When you `modprobe
ide-scsi` (or otherwise load the module), it finds that hdc has no
driver, and is assigned as the driver for that device.
If ide-cd is compiled as a module, then your conf.modules example will
work. Under this configuration, a command line need not be given to the
kernel, because it can be given to the module after system boot. The
lines you mention in conf.modules will tell ide-cd not to assign itself
to the hdc device, so that ide-scsi can be assigned to it.
MSG
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