On Thu, Apr 15, 2010 at 11:42:59AM -0400, Mike Viau wrote:
> > Mon, 12 Apr 2010 19:02:12 +0300 <pasik@xxxxxx> wrote:
> >
> > On Mon, Apr 12, 2010 at 11:55:49AM -0400, Mike Viau wrote:
> > > > >
> > > > > > Can you please paste the full boot messages before it locks up?
> > > > > >
> > > > > >
> > > > >
> > > > > Unfortunately no, because I am not getting any output (kernel
> > > messages) to
> > > > > the terminal on the other machine listening. I attached a photo of
> > > what I
> > > > > see on the screen when console=com1,vga.
> > > > >
> > > >
> > > > So do you see the Xen hypervisor boot messages at least?
> > > >
> > > >
> > >
> > > Nothing in fact.
> > >
> >
> > Please paste your grub.conf again.
> >
> >
>
> Attached is grub.cfg.
>
> Please notice:
>
> menuentry "Xen 4.0.0 / PVOPS 2.6.32-4-xen-amd64 with a serial console" {
> insmod ext2
> set root=(hd2,1)
> search --fs-uuid --set 13f83e98-6e2e-48a5-992e-b266d17bbfd3
> multiboot /xen.gz dom0_mem=2048M loglvl=all guest_loglvl=all sync_console
> console_to_ring com1=115200,8n1,0x1000,0 console=com1
> module /vmlinuz-2.6.32-4-xen-amd64
> root=UUID=a8129b5a-f8cc-460e-bda4-93cc547b9f7e ro console=hvc0
> earlyprintk=xen
> module /initrd.img-2.6.32-4-xen-amd64
> }
>
>
> I have tried using both 0x1000 and 0x1008 with IRQ 21 and 22 and 0
>
So do you now get Xen hypervisor boot messages?
> > > > > > > Motherboard:
> > > > > > >
> > > > >
> > >
>
> [4]http://www.intel.com/products/desktop/motherboards/DP55WG/DP55WG-overview.htm
> > > > > > > [5]http://ark.intel.com/Product.aspx?id=40078
> > > > > > >
> > > > > > > Add-in serial card:
> > > > > > > "Cables Unlimited IOC-2200 2-Port DB9 Serial PCI I/O Card"
> > > > > > >
> > > > >
> > >
>
> [6](http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=1431863&CatId=1422)
> > > > > > >
> > > > > >
> > > > > > Does the serial console work with plain baremetal Linux?
> (without
> > > Xen).
> > > > > >
> > > > > >
> > > > >
> > > > > No it does not. I started a thread over on the Debian mailing-list
> for
> > > > > this though to see if anyone there had any ideas. I have got no
> > > replies as
> > > > > of yet.
> > > > >
> > > > > Mainly I was asking if one needed to build the mcs9865-serial.ko
> > > (kernel
> > > > > module) against the kernel source for the running kernel in order
> to
> > > log
> > > > > kernel message during boot time or does grub implement a generic
> > > driver to
> > > > > capture the kernel message?
> > > > >
> > > >
> > > > Uhm.. are you saying this serial-card requires some non-standard
> driver?
> > > > Then it probably can't be used as a serial console.
> > > >
> > >
> > > I was hoping this was not the case. The Linux kernel includes drivers
> for
> > > serial port devices does it not? Can anyone confirm if the Moschip
> MCS9865
> > > is or is not supported by the Linux kernel?
> > >
> > > Can I try using a generic driver with this card that is already built
> into
> > > the Linux kernel?
> >
> > Yeah, sure, try it.
>
> What driver (name or module name) do you suggest I start with. Another
> system has drivers like:
>
> 8250_accent.ko 8250_exar_st16c554.ko 8250_hub6.ko
> jsm/ serial_cs.ko
> 8250_boca.ko 8250_fourport.ko 8250_mca.ko
> max3100.ko
>
> What about serial_cs.ko?
>
>
> [1]http://www.google.com/#hl=en&source=hp&q=serial_cs.ko&meta=&aq=f&aqi=&aql=&oq=&gs_rfai=&fp=6909149b0ecd8aa
>
> > I don't know more about the serial card you have.
> >
> > > > The PCI serial-card needs to show up as a 'real' serial port, so
> that
> > > > Xen can output there boot time (before any drivers are loaded in
> dom0
> > > kernel).
> > > >
> > >
> > > How does one determine if it is real serial port or not. No
> /dev/ttyS[?]
> > > devices are created in the filesystem and there is nothing in the
> dmesg
> > > out for these serial ports either. The PCI add-in card was advertised
> to
> > > be Linux compatible.
> > >
> >
> > Real serial ports are available without any drivers, at boot time before
> Linux is loaded.
> > Xen needs to log to the serial port before _any_ drivers are loaded,
> even before dom0 Linux is loaded.
> >
>
> So the serial line use by grub 'taps' into real serial ports only right?
> So is a driver even needed at all if all the details such as I/O address,
> IRQ, speed, etc are provided in the grub configuration?
>
> Many there is a hardware limitation I am unaware or blind to see?
>
> > It's the same with USB-serial-adapters.. you can't use those for serial
> console
> > because they don't work before the driver is loaded.
> >
> > But yeah.. good luck!
> >
> > -- Pasi
> >
>
> As the subject says "semi-solved."
>
> Used the patch found here:
>
> http://marc.info/?l=linux-serial&m=124975806304760
>
> 8250_pci: add support for MCS9865
>
> So lesson learned Pasi, a kernel driver must be compiled with the running
> kernel in order to capture boot messages from it. The driver does not load
> from the bootloader or from grub itself.
>
Ok. All the Serial Consoles I've used so far haven't required
special/additional drivers.
-- Pasi
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users
|
Home