------------------------------------------------------------------
Steven C. Timm, Ph.D (630) 840-8525
timm@xxxxxxxx http://home.fnal.gov/~timm/
Fermilab Computing Division, Scientific Computing Facilities,
Grid Facilities Department, FermiGrid Services Group, Assistant Group Leader.
On Mon, 14 Jan 2008, tmac wrote:
where do I get info for this particular instance:
kernel /boot/xen.gz dom0_mem=4000000 com1=9600,8n1
?
I am using ttyS1 (com2) and would prefer to use:
115200, 8 bits, no parity, 1 stop bit, no flow control (may hardware flow
control if there are issues).
you need on the xen.gz line com1=115200,8n1
and then on the first module line
console=ttyS1,115200
Steve
From serial, I can currently see the grub menu, I can press the arrow and
interact with grub and boot.
The serial side shows the boot process and stops after showing the
"kernel/module/module" stanze.
Any ideas?
thanks
On Jan 9, 2008 1:52 PM, Steven Timm < timm@xxxxxxxx> wrote:
Yes--, you need to add the following to grub.conf (at the beginning)
serial --unit=0 --speed=9600
terminal --timeout=10 serial console
Also you did not say if this is the dom0 you are booting or one
of the domu's.. but normally you should have a stanza like this in
grub.conf for the dom0
title Xen 3.1.0
root (hd0,0)
kernel /boot/xen.gz dom0_mem=4000000 com1=9600,8n1
module /boot/vmlinuz-2.6-xen ro root=LABEL=/ console=tty0
console=ttyS0,9600
module /boot/initrd-2.6.18-xen.img
The kernel names will be different for a redhatized system but you get the
idea. The two things you need are the serial stuff at the beginning
and then the right arguments both for the xen.gz and the vmlinuz lines.
Also you want to get rid of any splashimage line in the grub.conf
if you haven't already done so. splashimages can jam up serial consoles
or cause you to lose info in binary goop.
Steve Timm
On Wed, 9 Jan 2008, tmac wrote:
I have RHEL5.1 and XEN.
I had an issue this morning and wanted to see serial output.
I ran a serial cable between the host and another (Serial0 -> Serial0)
I checked the BIOS/Firmware and it had console re-dir on,
9600, No Par, 1 Stop bit, No Flow control
The system booted and I could see the output of the POST process.
*as soon* as grub started, the serial screen goes blank.
I tried to add "console=ttyS0,9600" to the command line, but nothing
seemed
to send output to the kernel.
Am I missing something?
Thanks
--
------------------------------------------------------------------
Steven C. Timm, Ph.D (630) 840-8525
timm@xxxxxxxx http://home.fnal.gov/~timm/<http://home.fnal.gov/%7Etimm/>
Fermilab Computing Division, Scientific Computing Facilities,
Grid Facilities Department, FermiGrid Services Group, Assistant Group
Leader.
--
--tmac
RedHat Certified Engineer #804006984323821 (RHEL4)
RedHat Certified Engineer #805007643429572 (RHEL5)
Principal Consultant, RABA Technologies
240-373-3926 (office) 301-688-4705 (Lab)
214-279-3926 (eFAX)
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