removable usb media don't present devices to mount

[Ryan Zeigler]

I'm using FreeBSD 6.0-rc1, and I'm having trouble with removable usb memory 
drives.  I plug the device in, and get this from dmesg:

umass0: LEXAR MEDIA JUMPDRIVE2, rev 2.00/1.25, addr 2

There is no mention at all of /dev/da0, which is, as I understand it, the 
device that is traditionally presented to mount.  usbdevs sees the device, 
and gives this output.

port 8 addr 2: high speed, power 70 mA, config 1, JUMPDRIVE2(0xa300), LEXAR 
MEDIA(0x05dc), rev 1.25

This occurs both with GENERIC kernels, and a custom kernel that I configured.  
The custom configuration is listed here:
http://www.dickinson.edu/~zeiglerr/STRMKERNEL

Other things of interest.  At random intervals, unplugging the device and 
replugging it gives me this out of dmesg:

umass0: LEXAR MEDIA JUMPDRIVE2, rev 2.00/1.25, addr 2
da0 at umass-sim0 bus 0 target 0 lun 0
da0: <Generic STORAGE DEVICE 1.25> Removable Direct Access SCSI-0 device
da0: 40.000MB/s transfers
da0: 250MB (512000 512 byte sectors: 64H 32S/T 250C)
(da0:umass-sim0:0:0:0): Synchronize cache failed, status == 0x10, scsi status 
== 0x0

However, the mount command hangs in this case (I left it, and came back an 
hour later and it hadn't mounted).

The USB drive works, as it is autodetected and mounted by Mac's and various 
other USB memory drives are not properly recognized either.

On a whim, I booted into a FreeSBIE live CD that I have, and it was 
automounted and functioned correctly.

One last little bit of interest, booting hangs immediately before attempting 
to mount / if I boot with the device plugged in.  Booting continues normally 
when I unplug the device.  I am not sure if this is significant.

I would appreciate any help that could be offered.  Thanks.

-- 
Ryan Zeigler
Dickinson '08