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To: John Baldwin <jhb@freebsd.org>
Subject: Re: Intel D2500CC motherboard and strange RS232/UART behavior
In-reply-to: <201304111050.37055.jhb@freebsd.org>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
References: <229402991.20130407172016@serebryakov.spb.ru>
 <201304101016.57894.jhb@freebsd.org> <20130411070139.GR76354@funkthat.com>
 <201304111050.37055.jhb@freebsd.org>
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Date: Thu, 11 Apr 2013 21:37:48 +0000
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Cc: John-Mark Gurney <jmg@funkthat.com>, lev@freebsd.org,
 Adrian Chadd <adrian@freebsd.org>, freebsd-current@freebsd.org
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In message <201304111050.37055.jhb@freebsd.org>, John Baldwin writes:

>> Though if these ports don't have the logic that the AST cards did to
>> share the IRQ, that'd make it hard...
>> 
>> The sio man page talks about this...
>
>These are multiport cards and something like puc or digi, etc. is fine for
>those.  The OP's issue is that he has a board with 4 independent 16550
>UARTs which are attempting to share IRQs.  Those are not multiport cards
>and are thus a separate issue.

I think you are mistaken, the 4 uarts are in the same chip and I am
sure they have done something sensible with the interrupts so they
can be shared.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.