MP3 umass hangs bus

[Peter Jeremy]

I have a LG UP3# MP3 player and when I connect it to a FreeBSD 6.2
system, it attaches OK but hangs the bus (I/O attempts fail).  Note
that the player states that it is supported by Linux so it should be a
fairly generic umass device.  The display initially reports "MSC MODE"
and that changes to "MSC BUSY" and stays that way until it is removed.

How should I go about debugging this?

I managed to get usbdevs to report that it is:
port 5 addr 2: high speed, power 300 mA, config 1, LGUP3S_MTP(0x70b1), LG Semiconductor Co., Ltd.(0x043e), rev 1.00

Kernel messages are:
Jul 22 13:59:43 turion kernel: umass0: vendor 0x043e LGUP3S, rev 2.00/1.00, addr 2
Jul 22 13:59:43 turion kernel: umass0: 8070i (ATAPI) over Bulk-Only; quirks = 0x0000
Jul 22 13:59:43 turion kernel: umass0:2:0:-1: Attached to scbus2
Jul 22 13:59:43 turion kernel: da0 at umass-sim0 bus 0 target 0 lun 0
Jul 22 13:59:43 turion kernel: da0: <LG UP3S 1.00> Removable Direct Access SCSI-0 device 
Jul 22 13:59:43 turion kernel: da0: 40.000MB/s transfers
Jul 22 13:59:43 turion kernel: da0: 1979MB (4053921 512 byte sectors: 255H 63S/T 252C)
Jul 22 13:59:43 turion kernel: usbd_transfer_cb: short transfer 0<13
Jul 22 14:09:53 turion kernel: umass0: BBB reset failed, TIMEOUT
Jul 22 14:14:58 turion kernel: umass0: BBB bulk-in clear stall failed, TIMEOUT
Jul 22 14:20:03 turion kernel: umass0: BBB bulk-out clear stall failed, TIMEOUT
Jul 22 14:20:03 turion kernel: (da0:umass-sim0:0:0:0): Synchronize cache failed, status == 0x4, scsi status == 0x0

-- 
Peter Jeremy
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