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about USB Host on DM36X IPNC Ref

Hi all:

  I am developping on DM36X IPNC REF 3.0,  our board has changed to USB HOST mode,   and I choose "USB HOST" mode,  "USB DEVICE FS", "USB MASS STORAGE" build in.        Now when I plug in one USB disk.  the system can detect the USB disk, prompt info is below:

 ********************************************************************************************************************************************

[  943.130000] usb 1-1: new high speed USB device using musb_hdrc and address 9
[  943.290000] usb 1-1: configuration #1 chosen from 1 choice
[  943.370000] scsi3 : SCSI emulation for USB Mass Storage devices
[  948.430000]   Vendor: USB2.0    Model: Flash Disk        Rev: 2.60
[  948.440000]   Type:   Direct-Access                      ANSI SCSI revision: 02
[  948.480000] SCSI device sda: 4136960 512-byte hdwr sectors (2118 MB)
[  948.480000] sda: Write Protect is off
[  948.490000] sda: assuming drive cache: write through
[  948.500000] SCSI device sda: 4136960 512-byte hdwr sectors (2118 MB)
[  948.520000] sda: Write Protect is off
[  948.520000] sda: assuming drive cache: write through
[  948.530000]  sda:<7>usb-storage: queuecommand called
[  948.550000]  unknown partition table
[  948.580000] sd 3:0:0:0: Attached scsi removable disk sda
[  948.680000] sd 3:0:0:0: Attached scsi generic sg0 type 0

 ********************************************************************************************************************************************

 but under /dev/, there is no sda* , mabe the kernel can detect USB device, but can not create dev under /dev,     what is the reason about this ?

BERT REGARDS

Steven