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From: John Baldwin <jhb@freebsd.org>
To: freebsd-current@freebsd.org
Subject: Re: Intel D2500CC motherboard and strange RS232/UART behavior
Date: Tue, 9 Apr 2013 16:08:09 -0400
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 (bigwig.baldwin.cx); Tue, 09 Apr 2013 16:32:47 -0400 (EDT)
Cc: Adrian Chadd <adrian@freebsd.org>, lev@freebsd.org,
 Poul-Henning Kamp <phk@phk.freebsd.dk>
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On Sunday, April 07, 2013 5:46:34 pm Adrian Chadd wrote:
> On 7 April 2013 13:15, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote:
> > In message <1428566376.20130407234355@serebryakov.spb.ru>, Lev Serebryakov 
writ
> > es:
> >
> >>It  doesn't  look  so.  And  uart1  and  uart3  doesn't have interrupt
> >>according to `vmstat -i' (but share irq4 according to boot messages).
> >
> > Ohh, there you go...
> >
> > Interrupt sharing on ISA requires special magic...
> 
> .. did we really break shared interrupt handling on ISA?

When did it ever work?
 
> God, you made me remember ISA interrupt sharing. I thought the main
> source of evilness is edge shared interrupts?

Right, and ISA are edge and active-hi, so generally not shareable.

Lev,

Can you assign different interrupts via the BIOS somehow?

-- 
John Baldwin