Can anyone successfully use serial console to debug XEN-4.0.1-rc6?

Can anyone successfully use serial console to debug XEN-4.0.1-rc6?

[Yuehai Xu]

Hi,

I set my grub to use serial console:

...
kernel /boot/xen.gz dom0_mem=1024m console=com1 com1=115200,8n1
...

But I failed to get anything output from XEN. On the other hand, I can
get the output from kernel of Dom0 by this way:

...
module /boot/vmlinuz-2.6.31.13 ro root=LABEL=/1 maxcpus=1 console=ttyS0,115200n8
...

So, should anything special parameters be configured in order to get
the output of XEN?

Thanks,
Yuehai

Re: Can anyone successfully use serial console to debug XEN-4.0.1-rc6?

[Konrad Rzeszutek Wilk]

On Tue, Sep 21, 2010 at 11:23:01AM -0400, Yuehai Xu wrote:
> Hi,
> 
> I set my grub to use serial console:
> 
> ...
> kernel /boot/xen.gz dom0_mem=1024m console=com1 com1=115200,8n1

That should work. It works for me.
> ...
> 
> But I failed to get anything output from XEN. On the other hand, I can

What is your serial device? Is it a PCI card or is it built in?

> get the output from kernel of Dom0 by this way:
> 
> ...
> module /boot/vmlinuz-2.6.31.13 ro root=LABEL=/1 maxcpus=1 console=ttyS0,115200n8
> ...
> 
> So, should anything special parameters be configured in order to get
> the output of XEN?

Not if it is a normal built-in serial device. If it is a PCI(or PCI-e or Mini PCI-e)
then you have to fiddle a bit to find its ioport. It is discussed in detail on the Wiki -
search PVOPS Wiki and then for the Serial Xen troubleshooting one - Mr. Pasi made sure
to include a wealth of details on how to work this out.

Re: Can anyone successfully use serial console to debug XEN-4.0.1-rc6?

[Yuehai Xu]

On Tue, Sep 21, 2010 at 11:37 AM, Konrad Rzeszutek Wilk
<konrad.wilk@oracle.com> wrote:
> On Tue, Sep 21, 2010 at 11:23:01AM -0400, Yuehai Xu wrote:
>> Hi,
>>
>> I set my grub to use serial console:
>>
>> ...
>> kernel /boot/xen.gz dom0_mem=1024m console=com1 com1=115200,8n1
>
> That should work. It works for me.
>> ...
>>
>> But I failed to get anything output from XEN. On the other hand, I can
>
> What is your serial device? Is it a PCI card or is it built in?

It is a PCI card, as you said, after adding corresponding IRQ and
IOPORT, it works.

>
>> get the output from kernel of Dom0 by this way:
>>
>> ...
>> module /boot/vmlinuz-2.6.31.13 ro root=LABEL=/1 maxcpus=1 console=ttyS0,115200n8
>> ...
>>
>> So, should anything special parameters be configured in order to get
>> the output of XEN?
>
> Not if it is a normal built-in serial device. If it is a PCI(or PCI-e or Mini PCI-e)
> then you have to fiddle a bit to find its ioport. It is discussed in detail on the Wiki -
> search PVOPS Wiki and then for the Serial Xen troubleshooting one - Mr. Pasi made sure
> to include a wealth of details on how to work this out.
>

Yeah, I'm afraid I don't read carefully about this wiki, ignoring the
hints about IRQ and IOPORT, sorry for making noise.

Thanks very much,
Yuehai

Re: Can anyone successfully use serial console to debug XEN-4.0.1-rc6?

[Pasi Kärkkäinen]

On Tue, Sep 21, 2010 at 11:37:39AM -0400, Konrad Rzeszutek Wilk wrote:
> On Tue, Sep 21, 2010 at 11:23:01AM -0400, Yuehai Xu wrote:
> > Hi,
> > 
> > I set my grub to use serial console:
> > 
> > ...
> > kernel /boot/xen.gz dom0_mem=1024m console=com1 com1=115200,8n1
> 
> That should work. It works for me.
> > ...
> > 
> > But I failed to get anything output from XEN. On the other hand, I can
> 
> What is your serial device? Is it a PCI card or is it built in?
> 
> > get the output from kernel of Dom0 by this way:
> > 
> > ...
> > module /boot/vmlinuz-2.6.31.13 ro root=LABEL=/1 maxcpus=1 console=ttyS0,115200n8
> > ...
> > 
> > So, should anything special parameters be configured in order to get
> > the output of XEN?
> 
> Not if it is a normal built-in serial device. If it is a PCI(or PCI-e or Mini PCI-e)
> then you have to fiddle a bit to find its ioport. It is discussed in detail on the Wiki -
> search PVOPS Wiki and then for the Serial Xen troubleshooting one - Mr. Pasi made sure
> to include a wealth of details on how to work this out.
> 

It's here:
http://wiki.xensource.com/xenwiki/XenSerialConsole

-- Pasi