Re: Xen Paravirt Operations Domain 0 Serial Console Problem

["Pasi Kärkkäinen" <pasik@iki.fi>]

On Tue, Aug 25, 2009 at 01:34:54AM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
> Dear Pasi,
> 
> Thanks for your help! It works!
> 
> I wonder why this didn't work:
> 
> title Fedora (2.6.31-rc6-enming.teo) Serial Console
>         root (hd0,0)
>         kernel /xen.gz iommu=1 com1=115200,8n1 console=com1
>         module /vmlinuz-2.6.31-rc6-enming.teo ro
> root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 console=ttyS0,115200
>         module /initrd-2.6.31-rc6-enming.teo.img
> 
> And this worked:
> 
> title pv_ops dom0-test (2.6.29-rc7-tip) with serial console
>         root (hd0,0)
>         kernel /xen-3.3.gz dom0_mem=1024M loglvl=all guest_loglvl=all 
>         com1=19200,8n1 console=com1
>         module /vmlinuz-2.6.29-rc7-tip ro root=/dev/vg00/lv01 console=hvc0 
>         earlyprintk=xen
>         module /initrd-2.6.29-rc7-tip.img
> 
> Anyway, I still got a tty1 output! I thought that after using serial 
> console, it is not supposed to output to a monitor anymore?
>

Well you still haven't disabled the VGA display adapter..
And most probably you still have gettys configured aswell.
 
> As a result of this, I still can't hide the VGA card from dom 0 and pass it 
> through to the Windows Dom U.
> 

See: http://wiki.xensource.com/xenwiki/VTdHowTo

Especially the section "Binding at Boot-Time".

-- Pasi

> Any ideas?
> 
> -- 
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering) 
> BEng(Hons)(Mechanical Engineering)
> Technical Support Engineer
> Information Technology Department
> Asiasoft Online Pte Ltd
> Tampines Central 1 #04-01 Tampines Plaza
> Singapore 529541
> Republic of Singapore
> Mobile: +65-9648-9798
> MSN: teoenming@hotmail.com
> Alma Maters: Singapore Polytechnic, National University of Singapore
> 
> 
> 
> On 08/25/2009 12:44 AM, Pasi Kärkkäinen wrote:
> >On Tue, Aug 25, 2009 at 12:17:53AM +0800, Mr. Teo En Ming (Zhang Enming) 
> >wrote:
> >   
> >>Hi All,
> >>
> >>I have tried to configure serial console for Xen hypervisor, dom 0
> >>kernel and Linux login but it does not seem to be working.
> >>
> >>Here is my grub configuration for serial console:
> >>
> >>title Fedora (2.6.31-rc6-enming.teo) Serial Console
> >>         root (hd0,0)
> >>         kernel /xen.gz iommu=1 com1=115200,8n1 console=com1
> >>         module /vmlinuz-2.6.31-rc6-enming.teo ro
> >>root=/dev/mapper/vg_fedora11_host-lv_root selinux=0 console=ttyS0,115200
> >>         module /initrd-2.6.31-rc6-enming.teo.img
> >>
> >>     
> >http://wiki.xensource.com/xenwiki/XenParavirtOps
> >
> >paste from that page:
> >
> >
> >Working example grub.conf with serial console output:
> >
> >title pv_ops dom0-test (2.6.29-rc7-tip) with serial console
> >         root (hd0,0)
> >         kernel /xen-3.3.gz dom0_mem=1024M loglvl=all guest_loglvl=all 
> >         com1=19200,8n1 console=com1
> >         module /vmlinuz-2.6.29-rc7-tip ro root=/dev/vg00/lv01 
> >         console=hvc0 earlyprintk=xen
> >         module /initrd-2.6.29-rc7-tip.img
> >
> >
> >   
> >>Is the above configuration correct? On my Intel Desktop Board DQ45CB, I
> >>have a COM1 header on the PCB and I have connected an external serial
> >>port to this header and also enabled COM1 in the BIOS.
> >>
> >>After selecting the above entry in GRUB still on VGA, a cursor at the
> >>top left corner of the monitor shows up, which means Xen and Dom 0
> >>kernel are booting up on the serial console and not on VGA.
> >>
> >>However, after some time, a login prompt finally displays on my VGA
> >>monitor! Isn't it NOT supposed to show up on VGA and should show up in
> >>serial console instead?
> >>
> >>     
> >You also need to have the gettys configured properly.
> >
> >-- Pasi
> >   
> 
> 
>