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

["Carb, Brian A" <Brian.Carb@xxxxxxxxxx>]

  >>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. 

I tried adding "console=ttyS0 xencons=ttyS" and this makes the "echo"
command not fail but I still see no output from it or from xen on the
serial console. 

Also tried the console=/dev/xvc0 but that doesn't seem to change
anything. In this case, what binds "console" to the serial port?

Should I be concerned about what's on or off in inittab, or is the
echoing of the xen boot messages occurring before we're looking at
inittab?

Any other suggestions? 


brian carb
unisys corporation - malvern, pa


-----Original Message-----
From: M.A. Williamson [mailto:maw48@xxxxxxxxxxxxxxxx] On Behalf Of Mark
Williamson
Sent: Thursday, October 18, 2007 1:27 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Cc: Carb, Brian A
Subject: Re: [Xen-users] dom0 no longer showing serial console output

> 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!

Cheers,
Mark

> 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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