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Date: Wed, 23 Apr 1997 17:52:37
To: questions@freebsd.org
From: John Clark <jc@netview.net>
Subject: Sharing PCI Interrupts
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Hello,

I was just wondering why these NICs shared the same interrupt on the PCI bus:

/kernel: de0 <Digital DC21140A Fast Ethernet> rev 32 int a irq 10 on pci0:13
/kernel: de0: SMC 9332BDT DC21140A [10-100Mb/s] pass 2.0
/kernel: de0: address 00:00:c0:80:ae:f9
/kernel: de1 <Digital DC21140A Fast Ethernet> rev 32 int a irq 10 on pci0:14
/kernel: de1: SMC 9332BDT DC21140A [10-100Mb/s] pass 2.0
/kernel: de1: address 00:00:c0:2d:ac:f9

I have another box that does not:

/kernel: de0: SMC 9332BDT DC21140A [10-100Mb/s] pass 2.0
/kernel: de0: address 00:00:c0:20:ae:f9
/kernel: vga0 <VGA-compatible display device> rev 0 int a irq ?? on pci0:10
/kernel: de1 <Digital DC21140A Fast Ethernet> rev 32 int a irq 10 on pci0:11
/kernel: de1: SMC 9332BDT DC21140A [10-100Mb/s] pass 2.0
/kernel: de1: address 00:00:c0:f2:ae:f9

Is the PCI interrupt sharing unique to Intel boards?

Thanks,


John Clark
[email@john.net]