Re: [Xen-devel] sudden hang on boot on AMD Notebook

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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

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