Date: Mon, 13 Oct 1997 01:10:12 -0700 (PDT) From: Doug White <dwhite@gdi.uoregon.edu> To: Eduardo Viruena Silva <mrspock@esfm.ipn.mx> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Serial Ports' IRQ and ports. Message-ID: <Pine.BSF.3.96.971013010855.9609I-100000@gdi.uoregon.edu> In-Reply-To: <Pine.BSF.3.96.971012145501.4878B-100000@michelle.esfm.ipn.mx>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sun, 12 Oct 1997, Eduardo Viruena Silva wrote: > 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. FreeBSD requires that every device have a unique IRQ, with exceptions made for multiport I/O cards and parallel ports in polled mode. > Do I have to specify a different IRQ level for each port ? Yes. Doug White | University of Oregon Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant http://gladstone.uoregon.edu/~dwhite | Computer Science Major
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.3.96.971013010855.9609I-100000>