Re: PCI init issues

Ivan Kokshaysky (
Wed, 5 Mar 2003 01:30:37 +0300

On Tue, Mar 04, 2003 at 01:16:22PM -0500, Donald Becker wrote:
> Incorrect.
> Most quad Tulip boards have the bus bridge wired so that all interrupts
> are sent on the INTA output of the board.

This can be true for older cards, but post-1998 hardware must follow
the spec.
PCI-to-PCI Bridge Architecture Specification, Rev 1.1, Dec 18, 1998,
pp 113-114:

"... The interrupt binding defined in this table is mandatory for
expansion boards utilizing a bridge.

[table skipped]

Device 0 on a secondary bus will have its INTA# line connected to
the INTA# line of the connector. Device 1 will have its INTA# line
connected to INTB# of the connector. This sequence continues and
then wraps around once INTD# has been assigned."

I know for a fact that at least D-Link card mentioned in some reports
utilizes all four INT# lines, because I have one.

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