Re: PCI Express

From: Jesse Barnes <jbarnes_at_engr.sgi.com>
Date: 2005-03-08 10:11:46
On Monday, March 7, 2005 3:03 pm, Nguyen, Tom L wrote:
> On Monday, March 07, 2005 12:41 PM Colin Ngam wrote:
> > I looked at Documentation/MSI-HOWTO.txt(linux-ia64-release-2.6.11) and
> >
> > it mentioned that CONFIG_X86_LOCAL_APIC has to be configured.  I did
>
> not
>
> > find this configured on in any sample ia64 config files, but it does
> > exist in defconfig for i386.  Is this just an ia32 config option?
>
> IA64 uses SAPIC instead of IOxAPIC. SAPIC, which is somewhat similar to
> IOxAPIC, is included in IA64 kernel. MSI/MSI-X support configuration
> option therefore is always available in IA64.

So the MSIs are programmed to point at the processor SAPIC block?  I think 
that'll work for us on Altix, but if they're pointed at an external Intel (or 
compatible) interrupt controller, we'll have to write new code for Altix.

Jesse
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Received on Mon Mar 7 18:24:11 2005

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