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.
Jamey
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
http://www.genode-labs.com/ · http://genode.org/
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