[pvrusb2] PVRUSB2 on NSLU2 with 2.6.21 dies after loading firmware

[Phil Endecott]

Dear All,

About a year ago I had my PVRUSB2 working with my Linksys NSLU2.

Since then the PVRUSB2 has laid idle, though the NSLU2 has been 
upgraded a number of times.  The NSLU2 is now fully supported by the 
mainline kernel and by Debian; I'm using the Debian-packaged 2.6.21 
kernel.  When I plugged in my PVRUSB2 last week I was hoping that it 
would just work, since the PVRUSB2 drivers are also now in the 
mainline.  Unfortunately, I see this in syslog:

May 23 23:37:17 chad kernel: usb 3-1.4.2: new high speed USB device 
using ehci_hcd and address 19
May 23 23:37:17 chad kernel: usb 3-1.4.2: configuration #1 chosen from 
1 choice
May 23 23:37:18 chad kernel: pvrusb2: Device microcontroller firmware 
(re)loaded; it should now reset and reconnect.

..and no further activity.

I'm using the same firmware files that worked last year.

Can anyone suggest what could be causing this, or what I should do next 
to debug it?

Many thanks,

Phil.