Hi Matt, Sorry for the late response, I think it's quite identical an issue with the one you discussed with Hao in another thread. I think it's working fine on my side.
U-Boot 2013.07 (ADI-2013R1-pre)-gf03fb57-dirty (Sep 10 2013 - 00:39:00), Build:3
CPU: ADSP bf527-0.0 (Detected Rev: 0.2) (parallel flash boot)
Board: ADI BF527 EZ-Kit board
Support: http://blackfin.uclinux.org/
Clock: VCO: 525 MHz, Core: 525 MHz, System: 131.250 MHz
RAM: 64 MiB
Flash: 4 MiB
In: serial
Out: serial
Err: serial
KGDB: [on serial] ready
Net: bfin_mac
Hit any key to stop autoboot: 0
bfin> usb start
(Re)start USB...
USB0: scanning bus 0 for devices... 1 USB Device(s) found
scanning usb for storage devices... 1 Storage Device(s) found
bfin> usb storage
Device 0: Vendor: Generic Rev: 9451 Prod: STORAGE DEVICE
Type: Removable Hard Disk
Capacity: 1886.0 MB = 1.8 GB (3862528 x 512)
bfin>