Xen users - Jun 2006 - Problem using the serial console on my Server

Hello

I run Xen 3.0 on debian stable. The Hardware Platform is a Intel Dual
Xeon Server Board (SE7520JR2) using the advanced management console.

The Advanced Management Console provides a console over serial/telnet.
Now my Problem is using this console. I add

com2=auto console=com2

to my xen kernel grub configuration. Then I get Xen and dom0s boot
output on the serial console. (without this I don''t get any output on
the serial con). 

However I can not get a getty to run on the serial port. 

The linux kernel only finds one serial line on bootup, I suspect that
xen takes the second one.

When I boot a plain linux kernel I get a login prompt on the console.
(Even without specifying a console=ttyS1 on the kernel param line)

Can anyone help me getting a login prompt on the serial console?

Thank you and kind regards

Flavio

--
http://no-way.org/~fcu/

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On Fri, Jun 09, 2006 at 10:01:46AM +0200, Flavio Curti wrote:
> When I boot a plain linux kernel I get a login prompt on the console.
> (Even without specifying a console=ttyS1 on the kernel param line)
> 
> Can anyone help me getting a login prompt on the serial console?
  Using grub I have the following options set:

#
# serial options:
# make sure that we have serial access so that bytemark magic works.
#
serial --unit=0 --speed=115200
terminal --timeout=10 serial console
default 0
timeout 5

  Then for Xen I have :

  ##
  ## Steve:  Added Xen kernel.
  ##
  title Xen 3.0 / XenLinux 2.6
  kernel /boot/xen.gz com1=115200,8n1
  module /boot/xen-linux-2.6.12.6-xen console=ttyS0,115200 max_loop=255
  module /boot/xen-modules-2.6.12.6-xen

  The combination of both of these seems sufficient to have serial
 access from bootup -> login.

  I hope that helps.

Steve
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Hi Steve

Thank you for your suggestions.

On Fri, Jun 09, 2006 at 09:11:05AM +0100, Steve Kemp
wrote:
> On Fri, Jun 09, 2006 at 10:01:46AM +0200, Flavio Curti wrote:
> 
> > When I boot a plain linux kernel I get a login prompt on the console.
> > (Even without specifying a console=ttyS1 on the kernel param line)
> > 
> > Can anyone help me getting a login prompt on the serial console?
> 
>   Using grub I have the following options set:
I get grubs output on the serial console. I also get the XEN and dom0
kernel output on the serial console. The only thing I can''t get is a
login prompt.

That''s because ttyS1 is not detected by the kernel. I suspect that xen
is using ttyS1 and disabling the kernel from detecting it...

Kind regards and thank you

Flavio

--
http://no-way.org/~fcu/

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Hi

Did changed the settings in your /etc/inittab? You need to spawn a getty 
for your serial ports. Take a look at this file, you might have examples 
for your distribution there. For gentoo it is:

s0:12345:respawn:/sbin/agetty 9600 ttyS0 vt100
s1:12345:respawn:/sbin/agetty 9600 ttyS1 vt100

Regards
Arnd

Flavio Curti schrieb:
> Hi Steve
> 
> Thank you for your suggestions.
> 
> On Fri, Jun 09, 2006 at 09:11:05AM +0100, Steve Kemp wrote:
>> On Fri, Jun 09, 2006 at 10:01:46AM +0200, Flavio Curti wrote:
>>
>>> When I boot a plain linux kernel I get a login prompt on the
console.
>>> (Even without specifying a console=ttyS1 on the kernel param line)
>>>
>>> Can anyone help me getting a login prompt on the serial console?
>>   Using grub I have the following options set:
> 
> I get grubs output on the serial console. I also get the XEN and dom0
> kernel output on the serial console. The only thing I can''t get is
a
> login prompt.
> 
> That''s because ttyS1 is not detected by the kernel. I suspect that
xen
> is using ttyS1 and disabling the kernel from detecting it...
> 
> Kind regards and thank you
> 
> Flavio
> 
> --
> http://no-way.org/~fcu/
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
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Hello Arnd

On Fri, Jun 09, 2006 at 11:56:31AM +0200, Arnd wrote:
> Did changed the settings in your /etc/inittab? You need to spawn a getty 
> for your serial ports. Take a look at this file, you might have examples 
> for your distribution there. For gentoo it is:
This is exactly the Problem. I don''t have a serial port to start a
getty
on. The kernel detects only one of the two serial ports. I think this is
because of Xen using the second one and making it unavailable to the
kernel later on.

Kind regards

Flavio

--
http://no-way.org/~fcu/

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Here''s a link to a HOWTO doc, if not googled already... :)

http://www.vanemery.com/Linux/Serial/serial-console.html

In my case, I use serial line rate "115200" instead of the different
rates
listed in the above doc.


On 6/9/06, Arnd <m_list@eshine.de> wrote:
>
> Hi
>
> Did changed the settings in your /etc/inittab? You need to spawn a getty
> for your serial ports. Take a look at this file, you might have examples
> for your distribution there. For gentoo it is:
>
> s0:12345:respawn:/sbin/agetty 9600 ttyS0 vt100
> s1:12345:respawn:/sbin/agetty 9600 ttyS1 vt100
>
> Regards
> Arnd
>
> Flavio Curti schrieb:
> > Hi Steve
> >
> > Thank you for your suggestions.
> >
> > On Fri, Jun 09, 2006 at 09:11:05AM +0100, Steve Kemp wrote:
> >> On Fri, Jun 09, 2006 at 10:01:46AM +0200, Flavio Curti wrote:
> >>
> >>> When I boot a plain linux kernel I get a login prompt on the
console.
> >>> (Even without specifying a console=ttyS1 on the kernel param
line)
> >>>
> >>> Can anyone help me getting a login prompt on the serial
console?
> >>   Using grub I have the following options set:
> >
> > I get grubs output on the serial console. I also get the XEN and dom0
> > kernel output on the serial console. The only thing I can''t
get is a
> > login prompt.
> >
> > That''s because ttyS1 is not detected by the kernel. I suspect
that xen
> > is using ttyS1 and disabling the kernel from detecting it...
> >
> > Kind regards and thank you
> >
> > Flavio
> >
> > --
> > http://no-way.org/~fcu/
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@lists.xensource.com
> > http://lists.xensource.com/xen-users
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

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