Sandor,
 Try the following change

title Red Hat Enterprise Linux Server (2.6.18-53.1.14.el5xen)
   root (hd0,0)
   kernel /xen.gz-2.6.18-53.1.14.el5 com1=9600,8n1
   module /vmlinuz-2.6.18-53.1.14.el5xen ro root=/dev/md2
console=ttyS0,9600n8
   module /initrd-2.6.18-53.1.14.el5xen.img

Jeff

Sandor W. Sklar wrote:
> Hi, Folks ...
>
> I'm trying to set up a Dom0 Xen system on a Sun X4200 M2 server. The
> problem I'm having is getting the xen kernel to send any output to the
> serial console, and once up, to have a getty available on that console.
>
> My grub.conf contains this:
>
> ##
> default=1
> timeout=60
> serial --unit=0 --speed=9600
> terminal --timeout=60 serial console
> title Red Hat Enterprise Linux Server (2.6.18-53.1.14.el5)
>   root (hd0,0)
>   kernel /vmlinuz-2.6.18-53.1.14.el5 ro root=/dev/md2
> console=ttyS0,9600n8
>   initrd /initrd-2.6.18-53.1.14.el5.img
> title Red Hat Enterprise Linux Server (2.6.18-53.1.14.el5xen)
>   root (hd0,0)
>   kernel /xen.gz-2.6.18-53.1.14.el5 console=ttyS0,9600n8 console=ttyS0
>   module /vmlinuz-2.6.18-53.1.14.el5xen ro root=/dev/md2
> console=ttyS0,9600n8
>   module /initrd-2.6.18-53.1.14.el5xen.img
> ##
>
> If I select the non-xen entry, all works as expected; get the boot
> messages (after the grub menu is displayed) on the serial console, and
> when the system finishes start up, I'm presented with a functional login
> prompt.
>
> If I select the xen entry at the grub menu, though, the system continues
> to boot, but the only thing displayed to the serial console is:
>
>
>  Booting 'Red Hat Enterprise Linux Server (2.6.18-53.1.14.el5xen)'
>
> root (hd0,0)
> Filesystem type is ext2fs, partition type 0xfd
> kernel /xen.gz-2.6.18-53.1.14.el5 console=ttyS0,9600n8 console=ttyS0
>   [Multiboot-elf, <0x100000:0xbe5f8:0x50a08>, shtab=0x20f078,
> entry=0x100000]
> module /vmlinuz-2.6.18-53.1.14.el5xen ro root=/dev/md2 console=ttyS0,9600n8
>   [Multiboot-module @ 0x210000, 0x8fa4d8 bytes]
> module /initrd-2.6.18-53.1.14.el5xen.img
>   [Multiboot-module @ 0xb0b000, 0x5f9200 bytes]
>
>
> ... and after that, nothing goes to the serial console, nor is there any
> login prompt offered. I can ssh in, of course, and run "dmesg". Here
> are all the messages related to console stuff:
>
> # dmesg | egrep -i 'console|vga|tty|serial'
> Bootdata ok (command line is ro root=/dev/md2 console=ttyS0,9600n8)
> Kernel command line: ro root=/dev/md2 console=ttyS0,9600n8
> Console: colour VGA+ 80x25
> Xen virtual console successfully installed as ttyS0
> Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
> 8250_pnp: Unknown symbol serial8250_unregister_port
> 8250_pnp: Unknown symbol serial8250_register_port
>
>
> Is there something obvious I'm missing? I've googled around for this,
> and it seems a common problem, without an obvious solution.
>
> Thanks!
>   -s-
>
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