pre-flash backup fails

Mon Jul 21 02:32:01 CEST 2008

I followed the directions here http://wiki.openmoko.org/wiki/Pre-Flash_Backup
I could backup the kernel of my GTA02 but trying to use that method to backup the rootfs failed 
several times....
 dfu-util - (C) 2007 by OpenMoko Inc.
 This program is Free Software and has ABSOLUTELY NO WARRANTY
 Opening USB Device 0x0000:0x0000...
 Claiming USB DFU Runtime Interface...
 Determining device status: state = appIDLE, status = 0
 Device really in Runtime Mode, send DFU detach request...
 Resetting USB...
 Opening USB Device...
 Found Runtime: [0x1d50:0x5119] devnum=20, cfg=0, intf=0, alt=6, name="rootfs"
 Claiming USB DFU Interface...
 Setting Alternate Setting ...
 Determining device status: state = dfuIDLE, status = 0
 dfuIDLE, continuing
 Transfer Size = 0x1000
 dfu_upload error -110
In demsg I get this error
 usb 5-2: usbfs: USBDEVFS_CONTROL failed cmd dfu-util rqt 161 rq 2 len 4096 ret -110
I have not been able to backup rootfs using this method.
I can flash OK though.
Any ideas?
-- 
Jim Morris, http://blog.wolfman.com