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    SubjectRe: PCI-PCI bridges mess in 2.4.x


    On Sat, 11 Nov 2000, Ivan Kokshaysky wrote:

    > On Fri, Nov 10, 2000 at 07:35:41PM +0100, Gerard Roudier wrote:
    > > I only have spec 1.0 on paper. I should have checked 1.1. Anyway, it may
    > > still exist bridges that have been designed prior to spec. 1.1.
    >
    > Yes, DEC 2105x bridges, for example.
    >
    > The only update listed in revision history is "Update to include
    > target initial latency requirements", so this (base > limit) stuff
    > must be in rev. 1.0 as well. Please check chapters 3.2.5.[6,8,9].

    The revision history should be a lot pessimistic about the amount of
    additions. Btw, rev. 1.0 April 5, 1994 is 63 pages, and rev 1.1 is about
    147 pages, as you know.

    > > > I/O is slightly different because it's optional for the bridge -
    > > > but if it's implemented same rules apply.
    > >
    > > Will also check the spec. on this point. :)
    >
    > Also, according the spec, we need some paranoia checks ;-)
    > 1. check if the bridge has an I/O window not implemented

    Read-only, returning zero on read. Already present in spec. 1.0.

    > 2. if the bridge has regular BARs, allocate them properly
    > on the primary bus.

    Limit < Base (new in 1.1, unless I missed the point. Btw, I actually
    donnot want to read again P2P spec. 1.0 :-) )

    Gérard.

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