Date: Fri, 12 Apr 2013 17:08:19 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: "Poul-Henning Kamp" <phk@phk.freebsd.dk> Cc: John-Mark Gurney <jmg@funkthat.com>, freebsd-current@freebsd.org, Adrian Chadd <adrian@freebsd.org> Subject: Re: Intel D2500CC motherboard and strange RS232/UART behavior Message-ID: <1941756367.20130412170819@serebryakov.spb.ru> In-Reply-To: <1449.1365716268@critter.freebsd.dk> References: <229402991.20130407172016@serebryakov.spb.ru> <201304101016.57894.jhb@freebsd.org> <20130411070139.GR76354@funkthat.com> <201304111050.37055.jhb@freebsd.org> <1449.1365716268@critter.freebsd.dk>
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Hello, Poul-Henning. You wrote 12 =D0=B0=D0=BF=D1=80=D0=B5=D0=BB=D1=8F 2013 =D0=B3., 1:37:48: >>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. PHK> I think you are mistaken, the 4 uarts are in the same chip and I am PHK> sure they have done something sensible with the interrupts so they PHK> can be shared. Maybe physically, it is one chip (I'm sure, it is), but they are detected as completely independent devices, each with its own I/O port and interrupt... Multiport cards typically group access to "logic" 16550 registers... --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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