accessing USB device with long Initialization

[Hanspeter Roth]

Hello,

I've upgraded to 5.4-RC1 and I'd like to access an Mpman MP3 Player
via USB.

When I attach the USB device several messages appear and the Mpman
displays "Starting" but then /dev/da0 is not available.
The messages look like this:

11:12:22: umass0: vendor 0x10d6 Generic USB Disk Device, rev 1.10/1.00, addr 2
11:12:22: da0 at umass-sim0 bus 0 target 0 lun 0
11:12:22: da0: <GENERIC USB DISK DEVICE 1.00> Removable Direct Access SCSI-2 device 
11:12:22: da0: 1.000MB/s transfers
11:12:22: da0: 123MB (252509 512 byte sectors: 64H 32S/T 123C)
11:12:24: umass0: BBB reset failed, STALLED
11:12:24: umass0: BBB bulk-in clear stall failed, STALLED
11:12:24: umass0: BBB bulk-out clear stall failed, STALLED
11:12:24: (da0:umass-sim0:0:0:0): Synchronize cache failed, status == 0x4, scsi status == 0x0
11:12:24: umass0: BBB reset failed, STALLED
11:12:24: umass0: BBB bulk-in clear stall failed, STALLED
11:12:24: umass0: BBB bulk-out clear stall failed, STALLED
11:12:24: umass0: BBB reset failed, STALLED
11:12:24: umass0: BBB bulk-in clear stall failed, STALLED
11:12:24: umass0: BBB bulk-out clear stall failed, STALLED
11:12:24: umass0: BBB reset failed, STALLED
11:12:24: umass0: BBB bulk-in clear stall failed, STALLED
11:12:24: umass0: BBB bulk-out clear stall failed, STALLED
11:12:24: umass0: BBB reset failed, STALLED
11:12:24: umass0: BBB bulk-in clear stall failed, STALLED
11:12:24: umass0: at uhub2 port 1 (addr 2) disconnected
11:12:24: (da0:umass-sim0:0:0:0): lost device
11:12:24: (da0:umass-sim0:0:0:0): removing device entry
11:12:24: Opened disk da0 -> 5
11:12:24: umass0: detached


For comparison 5.3 calls the kernel debugger and NetBSD waits a
little longer and then allows access on the Mpman.

Can I make 5.4-RC1 allow accessing the Mpman?

-Hanspeter