From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <4e64a7709fe42fbfc4744c0171df28e2@plan9.bell-labs.com>
From: jmk@plan9.bell-labs.com
To: 9fans@cse.psu.edu
Subject: Re: UART device driver (Was: [9fans] random moving of cursor arrow)
In-Reply-To: <20030725163518.Z28024@cackle.proxima.alt.za>
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Date: Sat, 26 Jul 2003 01:50:56 -0400
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On Fri Jul 25 10:48:34 EDT 2003, lucio@proxima.alt.za wrote:
> ...
> I have a vested interest, anyway: I have a six-port BOCA card with
> the most creative way of mapping its six ports to the I/O and
> interrupt space and I'd like some suggestions on representing this
> in plan9.ini.
> ...

If it's an ISA card then shared interrupts will not work.

Use a line in plan9.ini for each port. Write a new driver (say
uartisa.c) with a pnp function which calls allocates the necessary
data structures and calls uarti8250alloc for each plan9.ini line,
say
	uart0=type=i8250 port=XXX irq=Y

See /sys/src/9/pc/uartpci.c for many clues.