Re: [Xen-devel] Xen Paravirt Operations Domain 0 Serial Console Problem
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.
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering)
Technical Support Engineer
Information Technology Department
Asiasoft Online Pte Ltd
Tampines Central 1 #04-01 Tampines Plaza
Republic of Singapore
Alma Maters: Singapore Polytechnic, National University of Singapore
On 08/25/2009 12:17 AM, Mr. Teo En Ming (Zhang Enming) wrote:
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
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
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:
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?
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