From owner-freebsd-hardware  Fri Jan 23 18:04:54 1998
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Date: Fri, 23 Jan 1998 17:48:21 -0800 (PST)
From: Tom <tom@sdf.com>
To: Bill Rainey <brainey@cisco.com>
cc: hardware@FreeBSD.ORG
Subject: Re: Intel Pro 100/B Ethernet card - PCI irq assignment
In-Reply-To: <199801240140.RAA18281@brainey-ss20.cisco.com>
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On Fri, 23 Jan 1998, Bill Rainey wrote:

> 
> I've installed a EtherExpress Pro 100/B card and the system seems to be
> running fine with it but I have a question about the way IRQs are
> assigned for PCI devices.
> 
> I noticed after I config'd the kernel and installed the card that fxp0
> was sharing IRQ 11 with the WinCast/TV and the Matrox Millenium
> cards. It this reasonable (a feature of the PCI bus) or should it
> really have its own IRQ ? How is IRQ assignment done for PCI cards ?
> As I said, it seems to work okay so far.

  IRQs are assigned by your motherboard.  PCI supports IRQ sharing.

> Thanks,
> Bill Rainey
> 
> -----------------------------------------------------------------------
>   FreeBSD 3.0-CURRENT #0: Fri Jan 23 03:36:15 PST 1998
>       brainey@avatar.cisco.com:/src/current/sys/compile/AVATAR
>   CPU: Pentium Pro (199.43-MHz 686-class CPU)
>     Origin = "GenuineIntel"  Id = 0x616  Stepping=6
>     Features=0xf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV>
>   real memory  = 134217728 (131072K bytes)
>   avail memory = 127897600 (124900K bytes)
>   Probing for devices on PCI bus 0:
>   chip0: <Intel 82371FB PCI to ISA bridge> rev 0x02 on pci0.2.0
> > bktr0: <BrookTree 848> rev 0x11 int a irq 11 on pci0.6.0
>   Hauppauge WinCast/TV, Philips NTSC tuner, dbx stereo.
> > fxp0: <Intel EtherExpress Pro 10/100B Ethernet> rev 0x02 int a irq 11 on pci0
>   .10.0
>   fxp0: Ethernet address 00:a0:c9:8e:ed:19
> > vga0: <Matrox MGA 2064W graphics accelerator> rev 0x01 int a irq 11 on pci0.1
>   2.0
>   ahc0: <Adaptec 2940 Ultra SCSI host adapter> rev 0x00 int a irq 10 on pci0.14
>   .0
>   ahc0: aic7880 Wide Channel, SCSI Id=7, 16 SCBs
> -----------------------------------------------------------------------
> 
> 

Tom