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Re: Message Signalled Interrupt Support



Could anyone please explain how the MSI is supposed to work??
----- Original Message -----
From: Carl Jackson <jackson@rsn.hp.com>
To: PCI SIG email reflector <pci-sig@znyx.com>
Sent: Wednesday, February 23, 2000 4:52 AM
Subject: Re: Message Signalled Interrupt Support


> At 05:29 PM 2/20/00 , Brad Hosler wrote:
> >PCI 2.2 defines a Message Signalled Interrupt (MSI) feature, to allow the
card
> >to issue an interrupt as a PCI write message.
> >
> >Its presenting a "who-comes-first" scenario.  There are SW developers
that
> >want to support this feature; however, they want to know if there are
IHV's
> >who are adding support to their cards.  If there is no IHV interest,
> >SW support
> >may be pulled due to lack of validation.
> >
> >Are there any cards available or that will be available that will support
> >the MSI capability?
>
>
> PCI-X requires devices that generate interrupts to support MSI (with a
> 64 bit message address).  MSI is still optional for platforms and
> system software but the required availability should make support in
> systems much more likely.
>
> --
> Carl Jackson                      Hewlett-Packard Company
> voice: (972)497-4268              High Performance Systems Lab
> fax:   (972)497-4245              3000 Waterview Parkway
> mailto:jackson@rsn.hp.com         Richardson, TX 75080
>
>