Re: Message Signalled Interrupt Support

[Carl Jackson <jackson@rsn.hp.com>]

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
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