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Old 11-11-2006, 05:39 AM   #1
Vitalie Ciubotaru
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Question Can't use USB memory stick


Hi everybody and thanks a lot for your replies
There are threads with people asking how to do certain things with their USB devices, which means they managed to create/install them.
As for me, I don't know how to see my USB stick. LFS system definitely recognizes it - "dmesg" says usb_uhci module [or something similar] gets loaded. Shall I mount it somehow? A thread says it's about /dev/sda1 device, but I don't seem to have it. Shall I create it? How does one create files in /dev?

Vitalie CIUBOTARU
 
Old 11-11-2006, 06:03 AM   #2
druuna
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Hi,

I do believe you use LFS 6.1 (with 2.6 kernel). If that is the case: The sda entries are created when needed (take a look at /etc/udev/rules.d/25-lfs.rules).

When inserting a USB device (memory stick in your case) it should be recognized:

Before inserting usb stick:

$ ls -l /dev/sd*
ls: /dev/sd*: No such file or directory


After inserting USB stick:

$ ls -l /dev/sd*
brw-rw---- 1 root disk 8, 0 Nov 11 12:59 /dev/sda
brw-rw---- 1 root disk 8, 1 Nov 11 12:59 /dev/sda1


In the logfile (I log everything in /var/log/allmessages, dmesg shows only part of the text below) you should see this:

Nov 11 12:58:55 inferno kernel: usb 1-6: new high speed USB device using ehci_hcd and address 2
Nov 11 12:58:55 inferno kernel: scsi0 : SCSI emulation for USB Mass Storage devices
Nov 11 12:58:55 inferno kernel: usb-storage: device found at 2
Nov 11 12:58:55 inferno kernel: usb-storage: waiting for device to settle before scanning
Nov 11 12:59:00 inferno kernel: Vendor: USB Model: BAR Rev: 2.00
Nov 11 12:59:00 inferno kernel: Type: Direct-Access ANS I SCSI revision: 02
Nov 11 12:59:00 inferno kernel: sda: Unit Not Ready, sense:
Nov 11 12:59:00 inferno kernel: : Current: sense key=0x6
Nov 11 12:59:00 inferno kernel: ASC=0x28 ASCQ=0x0
Nov 11 12:59:00 inferno kernel: sda : READ CAPACITY failed.
Nov 11 12:59:00 inferno kernel: sda : status=1, message=00, host=0, driver=08
Nov 11 12:59:00 inferno kernel: sd: Current: sense key=0x6
Nov 11 12:59:00 inferno kernel: ASC=0x28 ASCQ=0x0
Nov 11 12:59:00 inferno kernel: sda: assuming Write Enabled
Nov 11 12:59:00 inferno kernel: sda: assuming drive cache: write through
Nov 11 12:59:00 inferno kernel: SCSI device sda: 512000 512-byte hdwr sectors (262 MB)
Nov 11 12:59:00 inferno kernel: sda: assuming Write Enabled
Nov 11 12:59:00 inferno kernel: sda: assuming drive cache: write through
Nov 11 12:59:00 inferno kernel: sda: sda1
Nov 11 12:59:00 inferno kernel: Attached scsi removable disk sda at scsi0, channel 0, id 0, lun 0
Nov 11 12:59:00 inferno kernel: Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0, type 0
Nov 11 12:59:00 inferno kernel: usb-storage: device scan complete
Nov 11 12:59:00 inferno scsi.agent[3307]: disk at /devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host0/target0:0:0/0:0:0:0
Nov 11 12:59:00 inferno udev[3319]: creating device node '/dev/sg0'
Nov 11 12:59:00 inferno udev[3317]: creating device node '/dev/sda'
Nov 11 12:59:00 inferno udev[3353]: creating device node '/dev/sda1'


For easy mounting you need an entry like this in your /etc/fstab:

/dev/sda1 /mnt/usb_01 auto noauto,rw,user 0 0

/mnt/usb_01 is a mountpoint created by me, you are free to change usb_01 into whatever you want (do change the fstab entry accordingly).

Hope this helps.
 
Old 11-12-2006, 02:28 PM   #3
Vitalie Ciubotaru
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Registered: Dec 2005
Location: Osaka, Japan
Distribution: Ubuntu Trinity
Posts: 153

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Thank you very much, druuna!
Funny enough, but mostly none of your advice applied.
1. /etc/udev/rules.d/25-lfs.rules file is OK. I never edited it, so it contains exactly what it should. sda entries are there.
2. /dev directory does not contain any sd* files - neither before, nor after inserting the USB stick.
3. I don't have /var/log/allmessages, so I still have to limit myself to "dmesg".
But I solved it! And it's definitely your merit.
dmesg says that after I plug my memory stick in the kernel module gets loaded, but no /dev entries get created. That made me think there's something with my kernel configuration. After some google search, I found out what exactly was wrong - I did not enable "SCSI drive support" in the kernel. Recompiling the kernel solved the whole issue.
For some reason udev [udev is taking care of it all, isn't it?] creates /dev/uba1 instead of /dev/sda1, but the name probably doesn't matter so much.
Wait, there's something I used almost "mot-a-mot" - I copied your /etc/fstab entry! It's great to see an shortcut to my memory stick created automatically in Gnome desktop!

Vitalie CIUBOTARU
 
  


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