linux-kernel - RE: Kernel Debugging Support

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Date:	Mon, 4 Aug 2014 19:07:53 +0000
From:	Paul Zimmerman <Paul.Zimmerman@...opsys.com>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"Nyman, Mathias" <mathias.nyman@...el.com>,
	Nick Krause <xerofoify@...il.com>
Subject: RE: Kernel Debugging Support

> From: linux-usb-owner@...r.kernel.org [mailto:linux-usb-owner@...r.kernel.org] 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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