[Xen-users] Howto use the serialport in domU (windows 2003 server)

[Martin Fernau <m.fernau@xxxxxxxxxx>]

Hello,

I just googled around since a day and I can't find a working solution to get 
the serial port to work under my domU (running windows server 2003). I want 
to use my external faxmodem from windows to receive incoming fax-calls from 
this machine.
What I've done so far:

--- cut
grub.conf 
kernel /boot/xen.gz
module /boot/kernel-xen xencons=off root=/dev/ram0 init=/linuxrc 
real_root=/dev/dm-1 dodmraid 
module /boot/initramfs-xen
--- cut

I enabled the 8250 driver in my kernel (I needed to disable the "XEN -> 
Disable serial port drivers" option in my 2.6.21-xen kernel for this)

--- cut
# dmesg | grep tty
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
00:0d: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:0e: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
--- cut

and I finally changed my domU config to this:

--- cut
# cat /mnt/data/xen/configs/windows
kernel = '/usr/lib/xen/boot/hvmloader'
builder = 'hvm'
memory = '1024'
cpus   = "0"
device_model='/usr/lib/xen/bin/qemu-dm'
disk = [ 'phy:/dev/mapper/vg-windows,hda,w',
         'phy:/dev/cdrom,hdb:cdrom,r' ]
serial = "/dev/ttyS0"
name = 'windows'
vif = ['type=ioemu, bridge=xenbr0']
boot="cd"
keymap='de'
vnc=1
vncviewer=0
sdl=0
--- cut

unfortunately - it doesn't work :/ Windows isn't able to use the serial port. 
Do I miss something? Is there any debug-output I can review to see any kinds 
of problems?

Regards,
Martin

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