[Xen-devel] Xen Paravirt Operations Domain 0 Serial Console Problem

["Mr. Teo En Ming (Zhang Enming)" <enming.teo@xxxxxxxxxxxxxxx>]

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

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?
All the while I get nothing displayed on the Windows laptop connected to 
the serial console of the Xen machine. I am using Windows Hyper Terminal 
with a null modem cable and a USB-to-Serial converter cable.
After seeing nothing on Hyper Terminal, I go to the VGA console (tty1) 
and keyboard and pressed CTRL-ALT-DEL to reboot the Xen machine.
Then finally I see this screenshot:

http://2.bp.blogspot.com/_zzjv8MCM2sk/SpK6D_eSIfI/AAAAAAAAATs/NdSPpfddTvQ/s1600-h/xen+serial+console.JPG

After that, I select rebooting using serial console but I still see 
nothing on Hyper Terminal.
May I know what's happening and what's wrong with serial console?

Thank you.

--
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@xxxxxxxxxxx
Alma Maters: Singapore Polytechnic, National University of Singapore



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