SMP and the aic7xxx driver

[Robert G. Brown]

On Tue, 21 Apr 1998, Warren W. Thompson wrote:

> (scsi0) <Adaptec AIC-7880 Ultra SCSI host adapter> found at PCI 12/0
> (scsi0) Narrow Channel, SCSI ID=7, 16/255 SCBs
> (scsi0) BIOS enabled, IO Port 0x6400, IRQ 16
> (scsi0) IO Memory at 0xe4000000, MMAP Memory at 0xc8800000
> (scsi0) Resetting channel
> (scsi0) Downloading sequencer code... 413 instructions downloaded
> scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.0.13/3.2.4
>        <Adaptec AIC-7880 Ultra SCSI host adapter>
> scsi : 1 host.
> (scsi0:0:-1:-1) Scanning channel for devices.
> <At this point the system hangs indefinitely>

I don't know why this happens, but it happened to me as well.  I
resolved it by rearranging the cards on my PCI bus.  This shifted the
IRQ's around "just enough" that 2.1.X's IO-APIC code worked again.
Interestingly, the arrangement that failed under 2.1.x worked under
2.0.x.  However, the arrangement that worked under 2.1.x ALSO worked
under 2.0.x.

Black magic.... but give it a try.

  rgb

Robert G. Brown	                       http://www.phy.duke.edu/~rgb/
Duke University Dept. of Physics, Box 90305
Durham, N.C. 27708-0305
Phone: 1-919-660-2567  Fax: 919-660-2525     email:rgb at phy.duke.edu




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