AT91SAM9260EK DFU - Error using dfu-util

[Fabio Porcedda]

Hi All,
I'm trying the dfu support for AT91SAM9260EK.

I've succefully activated it using th bp button, but
the dfu-util give me the error "Cannot open device".
I'm doing something wrong?
Can someone help me?

-----
I'm using:
 - Barebox 2013.01.0 - at91sam9260ek_defconfig
 - Ubuntu 12.10


-------
AT91SAM9260EK serial output:
dfu_bp pressed detected wait 5s

Start DFU Mode

dfu: register alt0(barebox) with device /dev/nand0.barebox.bb
dfu: register alt1(kernel) with device /dev/nand0.kernel.bb
dfu: register alt2(rootfs) with device /dev/nand0.rootfs.bb


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$ dfu-util -l
dfu-util 0.7
...
Found Runtime: [4321:1234] devnum=0, cfg=1, intf=0, alt=0, name="UNDEFINED"
Found Runtime: [4321:1234] devnum=0, cfg=1, intf=0, alt=1, name="UNDEFINED"
Found Runtime: [4321:1234] devnum=0, cfg=1, intf=0, alt=2, name="UNDEFINED"


-------
$ dfu-util -a 1 -D zImage
dfu-util 0.7
...
Cannot open device
Opening DFU capable USB device...



Best regards
--
Fabio Porcedda