Date: Sun, 12 Oct 1997 15:12:09 -0500 (CDT) From: Eduardo Viruena Silva <mrspock@esfm.ipn.mx> To: freebsd-questions@FreeBSD.ORG Subject: Serial Ports' IRQ and ports. Message-ID: <Pine.BSF.3.96.971012145501.4878B-100000@michelle.esfm.ipn.mx>
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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 ?
Do I have to specify a different IRQ level for each port ?
Thank you in advance.
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= \_| * \___\___/ * \_/\_/\__/\__\/_/\__/
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