Re: PCI Express

Jesse Barnes
2005-03-07T23:11:46Z

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