[XenPPC] finding the serial port

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

Maria,
It occurs to me that we currently assume the UART is off the ISA bus.
On a G5 the UART hags off the mac-io.
So conceivable you will want to do 1 of 2 things:
  1. uart.io_base = <absolute address>; isa_io_base = 0;
--or--
  2. uart.io_base = <offset from mac-io>; isa_io_base = <mac-io base>;

I always liked uart.io_base = <absolute address> but IIR hollis  
talked me into using isa_io_base so we could use inb() outb() in a  
familiar way (like Linux does)
Anyway, something to watch out for.
-JX

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