USB Host device automount

Hi
My name is Jeffrey and I come from Taiwan. I have a question and need
your help.
In TI OMAP 3530 platform, it only load “EHCI” driver.
When I plugged the “USB 2,0 device” to platform before booting ,
the message as follow.

//////////////////////////////////////////////////////////////////////////////////////////
# usb 1-1: new high speed USB device using im9828_atmel-ehci and
address 2
usb 1-1: New USB device found, idVendor=14cd, idProduct=8125
usb 1-1: New USB device strings: Mfr=1, Product=3, SerialNumber=2
usb 1-1: Product: USB 20 SD MMC M2 READER
usb 1-1: Manufacturer: SDMMC MA8125
usb 1-1: SerialNumber: 812520080625
usb 1-1: configuration #1 chosen from 1 choice
scsi0 : SCSI emulation for USB Mass Storage devices
scsi 0:0:0:0: Direct-Access USB 2.0 SD MMC Reader PQ: 0
ANSI: 0 CCS
sd 0:0:0:0: Attached scsi generic sg0 type 0
sd 0:0:0:0: [sda] 3862528 512-byte logical blocks: (1.97 GB/1.84 GiB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Assuming drive cache: write through
sd 0:0:0:0: [sda] Assuming drive cache: write through
sda: sda1
sd 0:0:0:0: [sda] Assuming drive cache: write through
sd 0:0:0:0: [sda] Attached SCSI removable disk
/////////////////////////////////////////////////////////////////////////////////////////

It means that it alreasy mounts USB Storage to sda1. My company's
platform can't show this message
even I plugged in USB 2.0 device before booting

How does it do like this? How about modified the "vold.conf" file ?
How to modify ?
Can you help me ?
Thank you
Jeffrey