Hi Marcel,
> I finally got things working well with my SAM9G45 USB devcie controller and
> continued to implement DFU for it.
> I implemented it using the new gadget layer and should be compatible with the
> at91_udc driver.
Excellent, congratulations!
> I have managed to get DFU working in such way that it transfers the file to
> RAM. There's still a lot to do, but most things are in place and working
> well. Basically after transfer to RAM, a u-boot script can handle additional
> actions, so I'm in doubt about the following :
>
> The DFU implementation I used as a basis came from openmoko. This implements
> directly flashing the device.
> However, my thought is that it's much better to just write the file to RAM
> and
> let a script in u-boot handle what should happen with it (verify, boot, flash)
> The DFU spec seems to handle this with the bitManifestationTolentant bit, but
> the current dfu-utils don't use this bit (that can be updated of course,
> which
> I already did).
I am not too familiar with the DFU spec, but I agree with regards to the
scripting. I can envision usage scenarios where the downloaded files
are written to other storage media, so I would much rather leave that up
to the U-Boot script interpreter.
> About the way it currently works :
> 1) I start u-boot
> 2) I issue the dfuinit command (new)
> 3) the host can now download a file to RAM.
> Any thoughts on what would be the most preferred way to do this ?
This sequence sounds absolutely feasible. What exactly is your
question?
> Additionally I think I will implement this as a composite driver so that both
> (usb)CDC and DFU are available via USB. I have both working, but currently
> must select it at compile time.
> My current implementation basically is just DFU as it assumes the application
> (not u-boot) to be the firmware to be updated, so no need to switch on
> descriptor layer level.
>
> Any reply on this would be nice, even if my above thoughts are in line.
> I hope to be able to post my changes in 1-2 weeks. After that my time is
> extremely limited due to long time travel.
I'm really looking forward to getting DFU support into U-Boot - having
lobbyied for it quite a while :)
> If anyone is interested in helping me out posting the changes it would
> be very much appreciated.
What help do you need?
Cheers
Detlev
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