Re: [linux-usb] USB CDROM and Laptop
On Thu, 16 Mar 2000, Hausheer, Geoffrey wrote:
> I have a USB Sony Spressa x2 CD-RW (which is an ATAPI drive with a USB
> adapter). I just installed 2.3.99pre1, and after following the directions
> in the Linux USB Guide, was able to get it to work without much difficulty.
> However, I have found a problem. To get the drive to work correctly, I need
> to have it plugged in before I load the usb-storage module (which needs the
> usb-uhci module installed before it is installed) and BEFORE scsi_mod and
> sr_mod are loaded. If it isn't done this way, the drive doesn't get
> recognized, and the system may or may not hang. Since this is in a laptop
> system, this drive is usually not hooked up, and I need a way to make it
> pluggable-unpluggable on the fly. I figured I could write some scripts to
> check that the scsi modules were unloaded when I do a mount, and run
> modprobe in the correct order, but this seemed like a hack. Is there a good
> way to get around this? I have found that sometimes I can't unload the scsi
> modules (without hanging the system), so this doesn't seem like the most
> reliable of solutions.
First, there are patches to 2.3.99pre1 that you should install. That will
probably fix the situation. These include 2 patches of mine, one from
Kees, and one from the linux-scsi list.
Basically, you'll be able to load usb-storage and have it auto-load the
usbcore and the scsi_mod modules. As for the system hang, you'll have to
give more information than what you have here.
> And a second question: How can I figure out what device the cdrom got
> mounted as? when I look at /proc/scsi/scsi it shows up as scsi0: something
> or other, and if I run cdrecord -scanbus, it shows up in the 0,0,0 slot.
> But I didn't know how to interpret this, and just tried mounting /dev/s*
> until I found it (it ended up being at /dev/scd0)
CD-ROM drives show up as /dev/scdX and are assigned numbers as they are
discovered. Thus the first CD is /dev/scd0, and the second will be
/dev/scd1
Matt Dharm
--
Matthew Dharm Home: mdharm@one-eyed-alien.net
Engineer, Qualcomm, Inc. Work: mdharm@qualcomm.com
Dudes! May the Open Source be with you.
-- Eric S. Raymond
User Friendly, 12/3/1998
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