[XenPPC] JS21 serial port address

[Maria Butrico <butrico@xxxxxxxxxxxxx>]

We are currently having troubles locating the serial port address on the 
JS21.
The machine has two serial ports one at address 2f8 and the other at 3f8 
both off the isa bus.   We believe that 3f8 is wired to serial over 
lan.  Thanks to a very enterprising colleague we have wired the port at 
2f8 to a real serial cable.   The firmware is SLOF.
When we boot Linux or Xen SLOF declares to be using 2f8 as the serial 
device.  Booting Xen or linux we see this on the console
--------

has started execution, serial console @ 2f8

---------

Both linux and Xen ask OF about its output device.  This is the output 
from Linux:
OF stdout device is: /ht/isa@8/serial@3f8

Xen receives a similar answer.  Since Xen uses it as the serial address 
we end talking to the wrong port.  Linux recovers since it can  be told 
as boot argument which tty to use.    Any ideas as to what could be 
going on here?

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