Can't flash smaller root-fs through dfu-util?

Igor Foox igorfoox at
Wed Aug 22 15:48:59 CEST 2007

On 8/21/07, Dr. H. Nikolaus Schaller <hns at> wrote:
> Am 21.08.2007 um 19:23 schrieb John Seghers:
> > Dr. H. Nikolaus Schaller wrote:
> >> After unsuccessfully flashing different root-filesystems, I finally
> >> found this note:
> >>> If you upload rootfs image that is smaller that previous one it
> >>> won't work - you need to attach to bootloader, erase NAND and then
> >>> upload your rootfs first:
> >>>
> >>> cu -l /dev/ttyACM0
> >>> GTA01Bv3 # nand erase rootfs
> >> This *should* help but I am trying to understand why dfu-util can't
> >> do that? And what do I do if I have no serial interface? Does this
> >> mean I can't ever again flash a (smaller) rootfs?
> >
> > I have no info on the first question, but about the serial interface.
> > The commands above actually run over USB.  Simply boot the Neo into
> > uBoot
> > (hold the Aux button while powering on) and select the option to
> > use the
> > console over USB (Move selection using Aux, invoke the selection by
> > pressing
> > power).  Then plug in the USB cable and run the "cu" command.
> Many thanks for your suggestions,
> but MacOS X has no cu command :-(
> And, I want to automate this all with dfu-util.
> BTW: the bug tracker (bugs #419, #719, #726) says it has been solved
> by a newer version of uboot - but to my experience
> it is not completely solved even by an uboot compiled 19th August.
> It looks like that contrary to the warnings on http://
> it is NOT optional.
> We all should flash a newer uboot first.
> Nikolaus

The problem is that many of us don't have a debug board, and it's a
bit scary to flash a new uboot which could brick the device. It would
be nice if some uboot builds were "blessed" so that we know we can
safely flash those without bricking the neo.

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