problems on a MCF547x board with ISP1561 as the usb controller

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I am new to this list.
I ran into two weird problems recently on a MCF547x board with ISP1561
as the usb controller.

It seems that ISP1561 does not give the mass storage device ACK when
issusing the GET_MAX_LUN command. This problem occurs when connect
some usb disks to the system.

Another problem is that usb system hangs up very rarely after system
reboot. Under this situation reset fails to bring the system back.
Only a cold boot (i.e. power off then power on) will bring the usb
system back.

Any clues?
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