Re: [Xen-users] Serial support with XEN and RHEL5.1

[Steven Timm <timm@xxxxxxxx>]

------------------------------------------------------------------
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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