Hi,

   I am using the USB device port on my i.MX21(ARM 9) Lite kit. When I
plug in a flash drive, it gets detected perfectly as a storage device.
But I am not able to access the contents of the drive. When I mount
the drive, it says that the mount failed.

  dmesg:

<4>Full speed Hub
<6>usb 1-2: new full speed USB device using imx21-hc and address 2
<4>Full speed Hub
<6>usb 1-2: configuration #1 chosen from 1 choice
<7>usb-storage: USB Mass Storage device detected
<7>usb-storage: -- associate_dev
<7>usb-storage: Vendor: 0x19b6, Product: 0x2048, Revision: 0x0100
<7>usb-storage: Interface Subclass: 0x06, Protocol: 0x50
<7>usb-storage: Transport: Bulk
<7>usb-storage: Protocol: Transparent SCSI
<6>scsi0 : SCSI emulation for USB Mass Storage devices
<7>usb-storage: *** thread sleeping.
<7>usb-storage: device found at 2
<7>usb-storage: waiting for device to settle before scanning
<7>usb-storage: usb_stor_control_msg: rq=fe rqtype=a1 value=0000 index=00 len=1
<7>usb-storage: GetMaxLUN command result is 1, data is 1
<7>usb-storage: queuecommand called
<7>usb-storage: *** thread awakened.
<7>usb-storage: Command INQUIRY (6 bytes)
<7>usb-storage:  12 00 00 00 24 00
<7>usb-storage: Bulk Command S 0x43425355 T 0x1 L 36 F 128 Trg 0 LUN 0 CL 6
<7>usb-storage: usb_stor_bulk_transfer_buf: xfer 31 bytes
<7>usb-storage: Status code 0; transferred 31/31
<7>usb-storage: -- transfer complete
<7>usb-storage: Bulk command transfer result=0
<7>usb-storage: usb_stor_bulk_transfer_sglist: xfer 36 bytes, 1 entries
<7>usb-storage: Status code 0; transferred 36/36
<7>usb-storage: -- transfer complete
<7>usb-storage: Bulk data transfer result 0x0
<7>usb-storage: Attempting to get CSW...
<7>usb-storage: usb_stor_bulk_transfer_buf: xfer 13 bytes
<7>usb-storage: Status code 0; transferred 13/13
<7>usb-storage: -- transfer complete
<7>usb-storage: Bulk status result = 0
<7>usb-storage: Bulk Status S 0x53425355 T 0x1 R 0 Stat 0x0
<7>usb-storage: scsi cmd done, result=0x0
<7>usb-storage: *** thread sleeping.
<5>scsi 0:0:0:0: Direct-Access     Moser    Baer AZ-601      0.00 PQ: 0 ANSI: 2
<7>usb-storage: queuecommand called
<7>usb-storage: *** thread awakened.
<7>usb-storage: Bad target number (1:0)
<7>usb-storage: scsi cmd done, result=0x40000
<7>usb-storage: *** thread sleeping.
<7>usb-storage: queuecommand called
<7>usb-storage: *** thread awakened.
<7>usb-storage: Bad target number (2:0)
<7>usb-storage: scsi cmd done, result=0x40000
<7>usb-storage: *** thread sleeping.
<7>usb-storage: queuecommand called
<7>usb-storage: *** thread awakened.
<7>usb-storage: Bad target number (3:0)
<7>usb-storage: scsi cmd done, result=0x40000
<7>usb-storage: *** thread sleeping.
<7>usb-storage: queuecommand called
<7>usb-storage: *** thread awakened.
<7>usb-storage: Bad target number (4:0)
<7>usb-storage: scsi cmd done, result=0x40000
<7>usb-storage: *** thread sleeping.
<7>usb-storage: queuecommand called
<7>usb-storage: *** thread awakened.
<7>usb-storage: Bad target number (5:0)
<7>usb-storage: scsi cmd done, result=0x40000
<7>usb-storage: *** thread sleeping.
<7>usb-storage: queuecommand called
<7>usb-storage: *** thread awakened.
<7>usb-storage: Bad target number (6:0)
<7>usb-storage: scsi cmd done, result=0x40000
<7>usb-storage: *** thread sleeping.
<7>usb-storage: queuecommand called
<7>usb-storage: *** thread awakened.
<7>usb-storage: Bad target number (7:0)
<7>usb-storage: scsi cmd done, result=0x40000
<7>usb-storage: *** thread sleeping.
<7>usb-storage: device scan complete

 The devices:

# cat /proc/devices
Character devices:
  1 mem
  2 pty
  3 ttyp
  4 /dev/vc/0
  4 tty
  4 ttyS
  5 /dev/tty
  5 /dev/console
  5 /dev/ptmx
  7 vcs
 10 misc
 13 input
 29 fb
 90 mtd
128 ptm
136 pts
180 usb
189 usb_device
253 usb_endpoint
254 usbmon

Block devices:
  1 ramdisk
 31 mtdblock
179 mmc

/ # cat /proc/partitions
major minor  #blocks  name

  31     0       8192 mtdblock0
  31     1        384 mtdblock1
  31     2       1664 mtdblock2
  31     3       2048 mtdblock3
  31     4       4096 mtdblock4

  The dev entries for sda are:

/dev # ls -l *sda*
brw-rw-rw-    1 0        0          8,   0 Jan  1 00:01 sda
brw-rw-rw-    1 0        0          8,   1 Jan  1 00:00 sda1
brw-rw-rw-    1 0        0          8,   2 Aug 14  2007 sda2

Mounting fails:

/dev # mount /dev/sda /mnt/usb
mount: mounting /dev/sda on /mnt/usb failed

/dev # mount /dev/sda1 /mnt/usb
mount: mounting /dev/sda1 on /mnt/usb failed

/dev # mount /dev/sda2 /mnt/usb
mount: mounting /dev/sda2 on /mnt/usb failed

  The config for SCSI and USB:

#
# SCSI device support
#
# CONFIG_RAID_ATTRS is not set
CONFIG_SCSI=y
# CONFIG_SCSI_TGT is not set
# CONFIG_SCSI_NETLINK is not set
CONFIG_SCSI_PROC_FS=y

#
# SCSI support type (disk, tape, CD-ROM)
#
CONFIG_BLK_DEV_SD=y
# CONFIG_CHR_DEV_ST is not set
# CONFIG_CHR_DEV_OSST is not set
# CONFIG_BLK_DEV_SR is not set
CONFIG_CHR_DEV_SG=y
# CONFIG_CHR_DEV_SCH is not set

#
# Some SCSI devices (e.g. CD jukebox) support multiple LUNs
#
CONFIG_SCSI_MULTI_LUN=y
# CONFIG_SCSI_CONSTANTS is not set
# CONFIG_SCSI_LOGGING is not set
# CONFIG_SCSI_SCAN_ASYNC is not set
CONFIG_SCSI_WAIT_SCAN=m

#
# SCSI Transports
#
# CONFIG_SCSI_SPI_ATTRS is not set
# CONFIG_SCSI_FC_ATTRS is not set
# CONFIG_SCSI_ISCSI_ATTRS is not set
# CONFIG_SCSI_SAS_ATTRS is not set
# CONFIG_SCSI_SAS_LIBSAS is not set

#
# SCSI low-level drivers
#
# CONFIG_ISCSI_TCP is not set
# CONFIG_SCSI_DEBUG is not set
# CONFIG_ATA is not set


#
# USB support
#
CONFIG_USB_ARCH_HAS_HCD=y
# CONFIG_USB_ARCH_HAS_OHCI is not set
# CONFIG_USB_ARCH_HAS_EHCI is not set
CONFIG_USB=y
# CONFIG_USB_DEBUG is not set

#
# Miscellaneous USB options
#
CONFIG_USB_DEVICEFS=y
# CONFIG_USB_DEVICE_CLASS is not set
# CONFIG_USB_DYNAMIC_MINORS is not set
# CONFIG_USB_SUSPEND is not set
# CONFIG_USB_OTG is not set

#
# USB Host Controller Drivers
#
# CONFIG_USB_ISP116X_HCD is not set
# CONFIG_USB_SL811_HCD is not set
CONFIG_USB_IMX21_HCD=y

#
# USB Device Class drivers
#
# CONFIG_USB_ACM is not set
# CONFIG_USB_PRINTER is not set

#
# NOTE: USB_STORAGE enables SCSI, and 'SCSI disk support'
#

#
# may also be needed; see USB_STORAGE Help for more information
#
CONFIG_USB_STORAGE=y
CONFIG_USB_STORAGE_DEBUG=y
# CONFIG_USB_STORAGE_DATAFAB is not set
# CONFIG_USB_STORAGE_FREECOM is not set
# CONFIG_USB_STORAGE_DPCM is not set
# CONFIG_USB_STORAGE_USBAT is not set
# CONFIG_USB_STORAGE_SDDR09 is not set
# CONFIG_USB_STORAGE_SDDR55 is not set
# CONFIG_USB_STORAGE_JUMPSHOT is not set
# CONFIG_USB_STORAGE_ALAUDA is not set
# CONFIG_USB_STORAGE_KARMA is not set
CONFIG_USB_LIBUSUAL=y

  There is no dmesg for the mount command. What else am I missing?

Thanks,
Midhun.

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