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Re: [Xen-users] serial/terminal console problems

  • To: "Mark Williamson" <mark.williamson@xxxxxxxxxxxx>
  • From: "Bruce Pennypacker" <bruce.pennypacker@xxxxxxxxx>
  • Date: Tue, 27 May 2008 13:58:36 -0400
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 27 May 2008 10:59:11 -0700
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On Wed, May 21, 2008 at 1:58 PM, Mark Williamson <mark.williamson@xxxxxxxxxxxx> wrote:
The baud rate doesn't need to be specified on the Linux command line since Xen
will set that up.  I suggest at least removing it just in case it's confusing
something.  I've also found that specifying two console= lines on the kernel
command line doesn't always work for me.  You could try just specifying one,
although I don't really understand why you're not getting *any* output.

However, probably the most straightforward way to tackle this is to just
concentrate on getting Xen to output on the serial line.  Drop the settings
that try to make Linux talk through Xen to the serial line, drop the setting
to try to make Xen talk vga at the same time.

Just concentrate on getting Xen to output its boot stuff to the serial port,
which should be a case of just getting Xen's serial settings right.  Once
that's done it should be (relatively) easy to figure out how to get Linux to
output to it.  Also, this way you should be able to get a local Linux console
whilst you're debugging, which may be useful.

Thanks for all the information.  I wasn't sure what was & wasn't important in the grub.conf.  I took out everything but the entries on the xen kernel line and now it's working as expected.

Just as a sanity check, are you sure the com1=57600,8n1 is all correct,

Yes.  When I booted the machine into a regular non-xen kernel the serial console worked fine. 

Thanks again for the help.

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