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Re: [Xen-users] dom0 no longer showing serial console output

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Subject: Re: [Xen-users] dom0 no longer showing serial console output
From: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date: Thu, 18 Oct 2007 18:27:20 +0100
Cc: "Carb, Brian A" <Brian.Carb@xxxxxxxxxx>
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> Running Xen unstable on SLES10 x64. Serial output was working correctly
> in changeset 15837 (the xen boot output was directed to both the
> standard vga console and the serial console).  I have recently upgraded
> to changeset 16112 and now I do not get any output on the serial
> console.
> In my menu.lst I have:
>     root (hd0,1)
>     kernel /boot/xen.gz com1=115200,8n1 apic_verbosity=debug
>     module /boot/vmlinuz-xen root=/dev/sda2 vga=0x314 resume=/dev/sda1
> splash=verbose showopts debug=y
>     module /boot/initrd-xen
> I have tried adding "console=ttyS0" but this doesn't seem to produce any
> output either.  The command
>   echo "test" >/dev/ttyS0
> errors with
>   -bash: /dev/ttyS0: No such device or address
> but /dev/ttyS0 does exist.

Try adding "xencons=ttyS" as well.  This'll tell the Xen console to appear as 
ttyS.  It's probably now appearing as /dev/xvc0 at the moment which may be 
why your setup wasn't working anymore.

Alternatively you could do console=/dev/xvc0 directly.

Let me know if this works or if we need to do some further fault finding!


> btw, serial output does show up when I boot the SLES kernel. Its entry
> is:
>     root (hd0,1)
>     kernel /boot/vmlinuz root=/dev/sda2 vga=0x314  resume=/dev/sda1
> splash=verbose showopts console=ttyS0,115200n8 console=tty0 debug
>     initrd /boot/initrd
> I suspect the xen serial console code has changed recently. Can anyone
> point me to some settings that will work. Thanks
> brian carb
> unisys corporation - malvern, pa

Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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