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Date:      Wed, 19 Apr 1995 00:18:05 PDT
From:      Bill Fenner <fenner@parc.xerox.com>
To:        freebsd-hardware@FreeBSD.org
Cc:        fenner@parc.xerox.com
Subject:   PCI plug-n-play on Intel Premiere Baby II?
Message-ID:  <95Apr19.001812pdt.49864@crevenia.parc.xerox.com>

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I just bought joe random PCI ethernet card, with a DEC 21040 chip on it.
I already had an NCR 53810 with a "PCI interrupt jumper" on it, which
allows the selection of PCI interrupt A through D.

The NCR was jumpered to PCI interrupt A.  When I plugged the ethernet card
in, they got probed as follows:

de0 <Digital DC21040 Ethernet> int a irq 9 on pci0:6
        reg20: virtual=0xf2925000 physical=0xc0000000
ncr0 <ncr 53c810 scsi> int a irq 9 on pci0:14
        reg20: virtual=0xf2926000 physical=0xc0001000

The SCSI probe hung while trying to scan the bus.  Not horribly surprising.

I changed the jumper on the NCR card to its interrupt B position.  When I
rebooted with this configuration, the probes looked *the*same* but the
SCSI probe no longer hung.

Any ideas what might be going on, or what I can do to make sure that these
cards aren't going to interfere with each other when I start using the
machine more heavily?

Thanks,
  Bill



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