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[Qemu-devel] [PATCH] Serial port suppourt for win32

From: Kazu
Subject: [Qemu-devel] [PATCH] Serial port suppourt for win32
Date: Wed, 15 Mar 2006 15:44:42 +0900


It is an experimental serial port support for win32. Here is patches and a


The 16550A patch is by Benoit Canet from here.

An option is:
-serial COM1

Use upper-case for COM number.
Dialog is popped up and set communication parameters.
After patches are applied and the first time Windows boots, Windows
recognizes the device is updated. So wait until a device driver is installed
and reboot.

I have not tested a real COM port.
I used ComEmulDrv which provides a virtual COM port pair as a device driver
for Win2k/XP. I set COM5 and COM6 by it and used HyperTerminal on both Win2k
guest and WinXP host. Files can be transfer between them.


Communication parameters are important. Tested parameters are:
Baud rate: 9600 bps
Data bit: 8 bit
Parity: none
Stop bit: 1
Flow control: none

It is necessary to set the same parameters among the guest and the host
and QEMU.

When flow control is hardware, if qemu-20060311-serial-win2kxp.patch is not
used, data can not be sent from Win2k guest to WinXP host.

It is too slow to use windbg. I will try to make a patch to use a named pipe
for it.


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