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

To: enming.teo@xxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Xen Paravirt Operations Domain 0 Serial Console Problem
From: "Mr. Teo En Ming (Zhang Enming)" <enming.teo@xxxxxxxxxxxxxxx>
Date: Tue, 25 Aug 2009 00:21:19 +0800
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Hi,

The main purpose of doing this is that I want to boot using serial console and free up the VGA card for direct access by the Windows HVM guest using VT-d IOMMU. But it seems I cannot get serial console working.

Please advise.

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



On 08/25/2009 12:17 AM, 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

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.





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