RE: Kernel Debugging Support

[Paul Zimmerman]

> From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb-owner@xxxxxxxxxxxxxxx] On Behalf Of Sarah Sharp
> Sent: Monday, August 04, 2014 9:47 AM
> 
> Please Cc the new xHCI driver maintainer, Mathias Nyman.  I'm officially
> retired from USB development and have moved onto other projects. :)
> 
> > After reading around seems people want support for usb debugging in
> > kgdb or other usb based solutions.
> 
> Yes, early boot USB debug over xHCI has been a low-priority feature
> request.
> 
> Unfortunately, USB debug is an optional feature for xHCI host
> controllers, so many of them don't have USB debug ports.  Even if it is
> included, the USB debug ports are often either routed to internal USB
> ports or not exposed on the board altogether.  Since it's not widely
> available, it's not a high priority to implement.

Hi Sarah,

Are you sure about that? Last I heard, xHCI debug support was a logo
requirement from Microsoft for Windows 8 and above, so I would have
thought that most vendors would have implemented it by now. I know
Synopsys put a lot of effort into making sure it works in our IP. Or
did Microsoft relax that requirement at the last minute?

-- 
Paul

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