Re: [Xen-users] Serial port access from DomU

[Chandramani Yadav <chandramani.yadav@xxxxxxxxx>]

Background:- I have tested a Gentoo Virtual machine (DOMU) to access the
serial port of Physical machine (opensuse 11.1) (DOM0) using the following
configuration.

Step1: Following modules should be loaded on the DOM0 
8250 
8250_pnp 
serial_core 

check is using "lsmod" command. 

Step 2:- Finding the IRQ and ioport ranges.

Run the following command on the DOM0 to find the irq for the serial port.

# 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

and run the following command to find the ioport


# cat /proc/ioports |grep serial
02f8-02ff : serial
03f8-03ff : serial

now add the following lines in the DOMU config file ( i mean configuration
file of virtual machine)


domU config: 
irq = [ 4 ] 
ioports = [ "02f8-02ff" ] 

check with minicom


uprooter wrote:
> 
> I'm having the same issue.
> Did you get any progress ?
> 
> 
> "David MÃller (ELSOFT AG)" wrote:
>> 
>> Hello
>> 
>> I would like to have access to the 4 serial ports (16550 based hardware,
>> no USB dongles) of the host system from a DomU.
>> 
>> I followed the steps mentioned in the Xen Wiki
>> (http://wiki.xensource.com/xenwiki/InstallationNotes#head-327388b324997719e864f8740fed06036c799e38),
>> but
>> 
>> I tried Debian Etch (Xen-3.0.3, linux-2.6.18-6-xen-686 in Dom0 and DomU)
>> and Debian Lenny (Xen-3.2, linux-2.6.18-6-xen-686 in Dom0 and
>> linux-2.6.18-6-xen-686 or linux-2.6.26-1-xen-686 in DomU)
>> 
>> The devices nodes "ttyS[0-3]" are present and i can start minicom using
>> them, but no characters are transmitted or received.
>> 
>> The "xen-tools.conf" file on Debian Lenny mentions that newer version of
>> the Xen guest kernel will use "xvc[0-9]" for the guest serial device,
>> but no "xvc" device nodes are present when running
>> linux-2.6.26-1-xen-686 in DomU.
>> 
>> Any ideas what's going wrong?
>> 
>> 
>> Dave
>> 
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-users
>> 
>> 
> 
> 

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