USB Debugging (was: Re: Best referance hardware at this point ?)

Jamey Sharp jamey at ...343...
Tue Nov 10 09:24:17 CET 2015

I used the Linux early printk support for USB debug adapters several years
ago, and found it quite helpful on whatever machines I was testing on at
the time.

But I also thought that the EHCI spec required at least one port to support
debug, which I recently learned is not true. So I have no idea how widely
supported that feature is on current hardware.

If someone is willing to take the time to implement it, though, I think USB
debug nicely complements the other console interfaces Genode already
supports, and is worth doing for that reason.

The only Linux console interface that would be nicer, in my opinion, is
netconsole, and that's a pain both to implement and to configure.

On Nov 9, 2015 11:43 PM, "Christian Helmuth" <
christian.helmuth at ...1...> wrote:

> Hello Jamey,
> On Mon, Nov 09, 2015 at 11:10:06AM -0800, Jamey Sharp wrote:
> > Support for USB debug adapters would be great, and doesn't require
> > fully configuring the USB host.
> Do you have experience with USB debugging? Are you refering to those
> EHCI debug port and appropriate dongle cables? Fellow developers are
> not that confident it is worth investigating from their past
> experiences, especially from the background of most debug ports not
> actually wired to connectors. But if you have tips, I'd like to have a
> look as we have two debug dongles in the labs.
> Regards
> --
> Christian Helmuth
> Genode Labs
> ·
> · /ˈdʒiː.nəʊd/
> Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
> Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth
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