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Message Signalled Interrupt Support

PCI 2.2 defines a Message Signalled Interrupt (MSI) feature, to allow the
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
may be pulled due to lack of validation.

Are there any cards available or that will be available that will support
the MSI capability?