[Xen-users] Parallel Port passthrough to Windows 2000 on Xen 4.1

[Adam Goryachev <mailinglists@xxxxxxxxxxxxxxxxxxxxxx>]

Hi all,

I've been trying to get a parallel port passed through to a MS Windows 2000 domU for the past few weeks with no real success.

grep parport /proc/interrupts
   5:          5          0          0          0  xen-pirq-ioapic-edge  parport0

So it is using IRQ5

cat /proc/ioports |grep parport
  0378-037a : parport0
So it is using the range 0378 - 037a

I added to the domU config file:
irq          = [ 5 ]
ioports   = [ "378-37a" ]

Then, windows will see the ioport, and create a xen device for these ports, it will see a separate device with IRQ 5 and add another xen device. I don't seem to be able to make both the ioport and IRQ a single device.
 
However, it seems the parallel port doesn't need an IRQ, so I tried to setup the ioport device as a Printer Port, but get a yellow triangle.

Finally, I found that qemu provides a "virtual" lpt1 which is using the same ioport range, so possibly this is causing the problem (ie, the same range of ioports are virtual and passthrough).

So, the question is, how can I disable the qemu virtual lpt1 port, and then hopefully passthrough the ioport range.

Or, another option is this URL:
http://alien.slackbook.org/dokuwiki/doku.php?id=slackware:qemu
[quote]

Accessing the host parallel port

If you need to print to a printer that is attached to the host computer's parallel port, you will have to pass an additional parameter on the qemu command line, like this:

qemu -parallel /dev/parport0 <other qemu parameters>

You might not have this device node /dev/parport0 available on your host, but QEMU requires the parallel port device name to start with the string parport. If your parallel port is called lp0 you can easily create a symbolic link called “parport0” to that device by running

[/quote]

How can I get qemu to do this?

All of this is to get a simple dot-matrix printer working :(

I'm using xen from debian testing
dpkg -l | grep xen
ii  libxen-4.1                           4.1.3-6                   amd64        Public libs for Xen
ii  libxenstore3.0                       4.1.3-6                   amd64        Xenstore communications library for Xen
ii  xen-hypervisor-4.1-amd64             4.1.3-6                   amd64        Xen Hypervisor on AMD64
ii  xen-system-amd64                     4.1.3-6                   amd64        Xen System on AMD64 (meta-package)
ii  xen-utils-4.1                        4.1.3-6                   amd64        XEN administrative tools
ii  xen-utils-common                     4.1.3-6                   all          Xen administrative tools - common files
ii  xenstore-utils                       4.1.3-6                   amd64        Xenstore utilities for Xen


Thank you for your assistance/suggestions.

Regards,
Adam

-- 
Adam Goryachev
Website Managers
www.websitemanagers.com.au

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