Still Having Fun with SCSI Emulation.

["Martin G. McCormick" <martin@dc.cis.okstate.edu>]

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	I built my kernel which is 2.217 and selected SCSI
support.  I also selected SCSI emulation as there is no SCSI
hardware.  There is an ATAPI CDROM and the new Plextor CDRW drive
will simply plug in to a remaining IDE slot on one of the
controllers which are in the system.

	Because of that, I also selected SCSI CDROM support
and the generic support.  The only thing I didn't select was any
hardware SCSI controllers, hard disk support or tape support.

	My /dev directory shows SG devices as in /dev/sg1, etc.

	When I boot, the dmesg output says the following
regarding SCSI devices:

scsi0 : SCSI host adapter emulation for IDE ATAPI devices
scsi : 1 host.
scsi : detected total.

	I am not sure if there should be something in the last
line that says
scsi : detected total.

	Then, I try something from root like

cdrecord -scanbus

I get

cdrecord: No such file or directory. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.
Cdrecord 1.8 (i686-pc-linux-gnu) Copyright (C) 1995-2000 Jörg Schilling

	Well, I was root when I did that and that was cdrecord
-scanbus.

	If I try a lucky guess like  cdda2wav -D/dev/sg1, I get
the following error:

cdda2wav: Bad file descriptor. Cannot open SCSI driver.
open(/dev/sg1) in file interface.c, line 474
Use the script scan_scsi.linux to find out more.
Probably you did not define your SCSI device.
You can scan the SCSI bus(es) with 'cdrecord -scanbus'.
Set the CDDA_DEVICE environment variable or use the -D option.
You can also define the default device in the Makefile.

	The debug option for cdrecord told me that the device
spec points to a null pointer which means that it is not set yet
and explains why nothing else works.  I could certainly set the
device name if I knew one that works.

	By the way, I am using a 2.217 kernel because the 2.4x
kernels seem to not respond to aumix settings.  I think I'll mess
with one problem at a time.  I did compile a 2.410 kernel and had
exactly the same SCSI weirdness.

	I think I maybe have missed a step or are
misunderstanding instructions in the documentation.  Right now,
nothing quite adds up.