Date: Mon, 13 Oct 1997 09:01:41 +0930 From: Greg Lehey <grog@lemis.com> To: Eduardo Viruena Silva <mrspock@esfm.ipn.mx> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Serial Ports' IRQ and ports. Message-ID: <19971013090141.09693@lemis.com> In-Reply-To: <Pine.BSF.3.96.971012145501.4878B-100000@michelle.esfm.ipn.mx>; from Eduardo Viruena Silva on Sun, Oct 12, 1997 at 03:12:09PM -0500 References: <Pine.BSF.3.96.971012145501.4878B-100000@michelle.esfm.ipn.mx>
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On Sun, Oct 12, 1997 at 03:12:09PM -0500, Eduardo Viruena Silva wrote: > > Hello there. > > I have a doubt about serial ports IRQs. > > Serial Ports are configurated according to the following table: > > FreeBSD MS-DOS io-address MS-DOS's IRQ > sio0 com1 0x3f8 4 > sio1 com2 0x2f8 3 > sio2 com3 0x3e8 4 > sio3 com4 0x2e8 3 > > But using the same IRQ for ports 0 & 2 or 2 & 3 causes kernel > configuration utility displays: "CONF" warning. > > Can the interrupt service routines distinguish which port is requiring > attention if I give the configuration in the table to the serial > ports ? No. > Do I have to specify a different IRQ level for each port ? Yes. It's not just a question of specifying an IRQ, you also have to set the boards accordingly. Greg
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