Xen devel - Jul 2008 - Unable to switch input to xen from serial console

At 18:42 +0530 on 02 Jul (1215024124), Sandesh wrote:
>   When i do ''xm dmesg'' the last statement says  "***
Serial input ->
> DOM0 (type ''CTRL-a'' three times to switch input to
Xen)" (i have no clue
> what''s that supposed to mean??) But when i press ctrl-a three
times at
> the serial console, nothing happens. 
>   Iam using minicom to connect to the serial port of xen machine.
Minicom uses Ctrl-A as an escape character.  You''ll need to press
Ctrl-A
_six_ times to cause Minicom to actually send it three times.

Cheers,

Tim.

-- 
Tim Deegan <Tim.Deegan@citrix.com>
Principal Software Engineer, Citrix Systems (R&D) Ltd.
[Company #02300071, SL9 0DZ, UK.]

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On 2/7/08 14:12, "Sandesh" <sandesh.ahiremath@wipro.com> wrote:
>   When i do ''xm dmesg'' the last statement says  "***
Serial input ->
> DOM0 (type ''CTRL-a'' three times to switch input to
Xen)" (i have no clue
> what''s that supposed to mean??) But when i press ctrl-a three
times at
> the serial console, nothing happens.
Press ''h'' after the three ctrl-a''s to see what debug
keys are available. Kdb
is not built into Xen by default.

 -- Keir



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Hi all,
  
  When i do ''xm dmesg'' the last statement says  "***
Serial input ->
DOM0 (type ''CTRL-a'' three times to switch input to Xen)"
(i have no clue
what''s that supposed to mean??) But when i press ctrl-a three times at
the serial console, nothing happens. 
  Iam using minicom to connect to the serial port of xen machine. Once
xen machine is booted i get the login prompt on the serial console. So i
dont think there is any problem with the serial setup.

My grub.conf is as below
title Fedora Core (2.6.18.8-xen-kdb)
        root (hd0,5)
        kernel /boot/xen-3.2.0.debug.gz console=com1,vga com1=115200,8n1
        module /boot/vmlinuz-2.6.18.8-xen.kdb ro root=LABEL=/1 rhgb quiet
console=tty1 console=ttyS1,115200,8n1
        module /boot/initrd-2.6.18.8-xen.img

My actual purpose is to break into xen hypervisor kdb. As per the instruction
ctrl-\ is supposed to give me the xkdb> prompt. But when i press ctrl-\ at
the
serial console nothing happens. So am assuming the problem is related to me not
able
to switch to xen input from serial console in the first place.


thanks,
  Sandesh


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On Wed, 2008-07-02 at 17:42 +0100, Tim Deegan wrote:
> Oh!  I wonder why it''s showing up as ttyS1.  Yes, changing the Xen
> command line to have "console=com2,vga com2=115200,8n1" should
work
> then.  
yes it worked..and its breaking into hypervisor kdb as well now.
 thanks a lot Tim & keir

Sandesh


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