Hello everyone！
platform ：am335x kernel version：linux-3.1.0-psp04.06.00.03.sdk OS： Linux
when I test the usb 3G，it is not working
root@DevKit8600:~# busybox eject /dev/sr0
[ 40.356495] sr0: CDROM (ioctl) error, command: cdb[0]=0x51 51 00 00 00 00 00 00 00 02 00
[ 40.365049] sr: Sense Key : 0x4 [current]
[ 40.369332] sr: ASC=0x0 ASCQ=0x0
[ 41.124111] usb 2-1.2: USB disconnect, device number 4
root@DevKit8600:~# [ 43.983805] usb 2-1.2: new full speed USB device number 5 using musb-hdrc
[ 44.104915] usb 2-1.2: New USB device found, idVendor=1bbb, idProduct=000f
[ 44.112103] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 44.119757] usb 2-1.2: Product: Qualcomm CDMA Technologies MSM
[ 44.125859] usb 2-1.2: Manufacturer: Qualcomm, Incorporated
[ 44.155158] scsi1 : usb-storage 2-1.2:1.0
[ 44.182847] usbserial_generic 2-1.2:1.1: generic converter detected
[ 44.218863] usb 2-1.2: generic converter now attached to ttyUSB0
[ 44.257525] usbserial_generic 2-1.2:1.2: generic converter detected
[ 44.308234] usb 2-1.2: generic converter now attached to ttyUSB1
[ 44.350107] usbserial_generic 2-1.2:1.3: generic converter detected
[ 44.410041] usb 2-1.2: generic converter now attached to ttyUSB2
[ 44.444459] usbserial_generic 2-1.2:1.4: generic converter detected
[ 44.494322] usb 2-1.2: generic converter now attached to ttyUSB3
[ 45.176936] scsi 1:0:0:0: CD-ROM Qualcomm MMC Storage 2.31 PQ: 0 ANSI: 2
[ 45.208224] sr0: scsi-1 drive
please help me！