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Re: [Xen-devel] Cannot load latest kernel on AMD quad-core

To: Gerry Reno <greno@xxxxxxxxxxx>
Subject: Re: [Xen-devel] Cannot load latest kernel on AMD quad-core
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Sun, 25 Apr 2010 13:22:50 +0300
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On Sun, Apr 25, 2010 at 02:53:08AM -0400, Gerry Reno wrote:
> Gerry Reno wrote:
>> Boris Derzhavets wrote:
>>> There is serial (cable)  via RJ45 ( Ethernet). Of course,  if it's  
>>> not your expense.
>>> Boris.
>> Found a USB-USB null modem cable at usbgear.com but will kernel  
>> support this for serial console?
>> -Gerry
> Ok, without a serial port on this machine the best I can do is use a  
> USB-Serial convertor which I realize will not provide BIOS or GRUB  
> messages.  To start with I changed the kernel boot line adding:  
> console=ttyUSB0,115200n8 and I setup minicom on the other machine.  At  
> first minicom would only give me unreadable characters so I assumed a  
> baud mismatch and began testing other rates.  At 57600n8 in minicom I  
> get this:
> this is with both the standard lucid kernel and the pv_ops dom0 kernel  
> using console=ttyUSB0,115200n8.  Any ideas on how to get more output?   
> And I don't know how to configure xen line to add console or if usb  
> serial console is even possible with xen.


USB serial is not possible as a serial console for Xen hypervisor.
USB drivers are in dom0 linux kernel, so Xen boot messages cannot be sent to 
USB serial since linux is loaded only after Xen hypervisor.

-- Pasi

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