From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Mr. Teo En Ming (Zhang Enming)" Subject: Xen Paravirt Operations Domain 0 Serial Console Problem Date: Tue, 25 Aug 2009 00:17:53 +0800 Message-ID: <4A92BD31.2040406@asiasoftsea.net> Reply-To: enming.teo@asiasoftsea.net Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org 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@hotmail.com Alma Maters: Singapore Polytechnic, National University of Singapore