UM0851 datasheet(63/245 Pages) STMICROELECTRONICS

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UM0851

Communication device drivers

Doc ID 16604 Rev 2

63/245

USB mass storage class

The USB mass storage standard provides an interface to a variety of storage devices, like

hard disk drives and Flash memories.

Plug in Flash memory into available USB port and then type the following command. The

device is picked up as a USB 1.1 and allocates an address. It also indicated which HCD is

used.

$ dmesg | less

usb 1-1: new full speed USB device using spear-ehci and address 2

usb 1-1: configuration #1 chosen from 1 choice

(SCSI emulation automatically kicks in)

scsi0 : SCSI emulation for USB Mass Storage devices

usb-storage: device found at 2

(Now the device information including model number is retrieved)

usb-storage: waiting for device to settle before scanning

Vendor: JetFlash

Model: TS2GJCV30

Type:

Direct-Access

ANSI SCSI revision: 02

SCSI device sda: 4014078 512-byte hdwr sectors (2055 MB)

(The write-protect sense is EXPERIMENTAL code in the later kernels)

sda: Write Protect is off

sda: assuming drive cache: write through

SCSI device sda: 4014078 512-byte hdwr sectors (2055 MB)

sda: Write Protect is off

sda: assuming drive cache: write through

sda:sda1

usb-storage: Attached SCSI removable disk

(At this point, the device is generally accessible by mounting /dev/sda1)

(When the device is disconnected, the system acknowledges the same)

usb 1-1: USB disconnect, address 2

/* Once the device is connected and mounted, you can access it like a normal hard

disk. Usual operations like cp, mv, rm, etc work fine. You could also create a file

system on the USB stick/format it. */

# mount /dev/sda1 /mnt/

# df -h

Filesystem

Size

Used

Avail

Use%

Mounted on

/dev/root

4.9M

2.5M

50%

dev

61.8M

/dev

tmpfs

1.9GM

453.0M

1.5G

23%

/mnt

tmpfs

2.0M

/tmp

/dev/sda1

1.9GM

453.0M

1.5G

23%

/mnt/

/* Digital cameras can be accessed the same way as memory sticks. */

USB communication device class (CDC)

The USB CDC class supports a lot of communication devices, including Ethernet.

Compile and then boot up the kernel with the options relevant to the USB Ethernet adapters

enabled. The options are covered in the configuration section below. Plug in the USB

Ethernet adapter, you can then see console messages that are similar to the following:

$hub 1-0:1.0: over-current change on prot 1

usb 1-1:new high speed USB device using spear-ehci and address 2

usb-1.1: configuration #1 chosen from 1 choice

eth0:register 'asix' at usb-SPEAr EHCI-1, ASIX AX88772 USB2.0

Ethernet,00;89:c8:3a:4c:0b

/* Type in the following command and check if the device has been recognized */

$ cat /proc/bus/usb/devices

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