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-   -   USB mount point is not shown in /dev entry point (http://www.linuxquestions.org/questions/linux-software-2/usb-mount-point-is-not-shown-in-dev-entry-point-4175440906/)

garryhk 12-10-2012 10:18 PM

USB mount point is not shown in /dev entry point
 
Hi All,

I flashed initrd image in to flash memory and booted the board.

After inserting the pendrive following logs are shown:

# usb 1-1.3: new high speed USB device using ehci_hcd and address 6
usb 1-1.3: New USB device found, idVendor=058f, idProduct=6387
usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1.3: Product: Mass Storage Device
usb 1-1.3: Manufacturer: JetFlash
usb 1-1.3: SerialNumber: 1TYSE94P
scsi4 : usb-storage 1-1.3:1.0
scsi 4:0:0:0: Direct-Access JetFlash TS4GJFV10 8.07 PQ: 0 ANSI: 2
sd 4:0:0:0: Attached scsi generic sg0 type 0
sd 4:0:0:0: [sda] 7843840 512-byte logical blocks: (4.01 GB/3.74 GiB)
sd 4:0:0:0: [sda] Write Protect is off
sd 4:0:0:0: [sda] Assuming drive cache: write through
sd 4:0:0:0: [sda] Assuming drive cache: write through
sda: unknown partition table
sd 4:0:0:0: [sda] Assuming drive cache: write through
sd 4:0:0:0: [sda] Attached SCSI removable disk


but when i checked in /dev,, sda mount point is not present.

Please let me know how i need to mount in in /dev ot where it will be mounted other than /dev?

smallpond 12-11-2012 03:10 PM

I guess you are not running udev, which would create the /dev node.
In that case you can make the dev entry yourself with
Code:

mknod /dev/sda b 8 0
where b is for block device and 8,0 are the major and minor numbers as shown in /proc/partitions.

It seems odd that there is no label on your pendrive. Normally there is an msdos label and you mount /dev/sda1.

garryhk 12-12-2012 09:09 AM

More infor required
 
Hi,

Thanks for ur valuable response.

In ur below reply "where b is for block device and 8,0 are the major and minor numbers as shown in /proc/partitions."

In /proc/ one file is present with "partions". In this file nothing is there.

How do i find the major and minor number for this device?

FYI:
Aftre inserting the pendrive ,in /proc/usb-device/scsi is this directory a number(4 or 5,which matches with sda when inserted) is present.

Is this number helpful for us?

smallpond 12-12-2012 05:28 PM

How about if you try:
Code:

cat /sys/block/sda/dev


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