Xen users - Apr 2008 - How to raise more than one serial port in guest domain

I''m wondering how to raise more than one serial port for guest domain
(RHEL4).

When doing my little development on Xen (3.1.0), I was in need of have double
device of some kind to validate one part of my program.(e.g, to let the guest
domain have 2 network adapters, etc) Considering that serial port should be the
most simple device on computer, I decided to insert my debugging code into
tools/ioemu/hw/serial.c for testing. But by normal booting there would be only
one serial port in each guest domain(and I added some code in serial.c reassured
this). I''ll be appreciating if anyone could tell me how to configure
Xen system to let it provide more than one serial port to its guest domain. I
tried to read XenWiki and other docs but did not find much.

So if anyone know how to raise more than one serial port for xen''s
guest domain please kindly indicate.

Thank you very much.

Warm Regards,
Lucky

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