[svlug] USB flashdrive problems

Jeff Frost jeff at frostconsultingllc.com
Thu Sep 20 16:36:55 PDT 2007

On Thu, 20 Sep 2007, Larry Colen wrote:

> We have what is effectively an embedded system. We are doing a
> monolithic (no modules) 2.6.9 kernel. If need be, we could go to
> modules, but for the time being we're stuck with 2.6.9. We need to
> mount a USB flash drive as storage.
> And, no, we can't go to	a post 2.6.15 kernel for a while.
> Pretty much all of the documentation I find seems to be for mounting
> USB on desktop systems under standard distributions.
> If I boot the system from a live CD, it finds, mounts and reads the
> flash drive just fine as sda1, vfat filesystem.
> We don't need it to be hot pluggable, it can be there from boot. We
> don't need plug and play.
> No matter what I do, when I mount it, I get the error message:
> bash-3.00# mount -t vfat /dev/sda1 /mnt
> mount: /dev/sda1 is not a valid block device
> I've enabled SCSI, USB, UHCI, EHCI ...
> Here is what I think is the relevent snippet from dmesg.
> usb 6-1: new device strings: Mfr=0, Product=0, SerialNumber=3
> usb 6-1: default language 0x0409
> usb 6-1: SerialNumber: 20060221165700-00
> usb 6-1: adding 6-1:1.0 (config #1, interface 0)
> usb-storage 6-1:1.0: usb_probe_interface
> usb-storage 6-1:1.0: usb_probe_interface - got id
> usb-storage: USB Mass Storage device detected
> usb-storage: -- associate_dev
> usb-storage: Vendor: 0x0ef5, Product: 0x2202, Revision: 0x0100
> usb-storage: Interface Subclass: 0x06, Protocol: 0x50
> usb-storage: Vendor: Unknown,  Product: Unknown
> usb-storage: Transport: Bulk
> usb-storage: Protocol: Transparent SCSI
> usb-storage: usb_stor_control_msg: rq=fe rqtype=a1 value=0000 index=00 len=1
> usb-storage: GetMaxLUN command result is 1, data is 0
> usb-storage: *** thread sleeping.
> scsi0 : SCSI emulation for USB Mass Storage devices
> USB Mass Storage device found at 2
> uhci_hcd 0000:00:1a.0: suspend_hc
> Output of some other exploratory comands:

What does /proc/scsi/scsi contain?

Jeff Frost, Owner 	<jeff at frostconsultingllc.com>
Frost Consulting, LLC 	http://www.frostconsultingllc.com/
Phone: 650-780-7908	FAX: 650-649-1954

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