From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: sudden hang on boot on AMD Notebook Date: Thu, 2 Apr 2015 15:03:27 -0400 Message-ID: <20150402190326.GC3131@x230.dumpdata.com> References: <20150330121404.GA4578@aepfle.de> <5519414F.8020207@citrix.com> <20150401133543.GA970@aepfle.de> <551C031D.5090803@citrix.com> <1427900227.13425.18.camel@citrix.com> <20150401172835.GA4429@l.oracle.com> <20150402061559.GA9555@aepfle.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20150402061559.GA9555@aepfle.de> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Olaf Hering Cc: Andrew Cooper , Ian Campbell , xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org On Thu, Apr 02, 2015 at 08:15:59AM +0200, Olaf Hering wrote: > On Wed, Apr 01, Konrad Rzeszutek Wilk wrote: > > > You can also use the USB EHCI debug port. It works great on laptops. > > Is there an howto for that? xen_commandline : console=vga,dbgp dbgp=ehci1 loglvl=all iommu=verbose,debug Which is because: [root@x230 konrad]# lspci | grep Enhanc 00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04) 00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04) And while both of them have an USB debug port (the first one), it looks to tied to the docking station. The other is the one I can plug the USB debug device. Naturally since this is an USB debug device you need to get an special $99 USB debug device (Google for it). The other end of the USB device goes in another machine on which I do screen /dev/ttyUSB0 115200 cs8 And I see the whole Xen console output. > > Olaf