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    SubjectRe: PCI riser cards and PCI irq routing, etc
    Krzysztof Halasa wrote:
    > Udo van den Heuvel <udovdh@xs4all.nl> writes:
    >
    >> I will try a different case with a different dual PCI riser card soon.
    >> This Morex riser has DN20-31 or so, so more options.
    >> Could this help solve my irq issue? (try 4 consecutive DNs until I have
    >> the right mapping?)
    >
    > I don't think so. Unless you can configure INT connections on the riser
    > card, of course.
    >
    > You need DN19 for the second slot (and perhaps 10 would work with
    > double INTx rotation), that's fixed in the BIOS.

    I have DN19 and DN20 now and it doesn't work.
    Only because the INT mapping on the riser is not right?

    http://www.morex.com.tw/drawing/MAR122-J%20Drawing.pdf shows some IDSEL
    jumper with ADxx numbers. What could these be?
    Photo at http://www.morex.com.tw/products/imgproduct/100-1.jpg.

    Still DN's?

    >> This Morex riser has DN20-31 or so, so more options.
    >
    > OTOH I wonder how do they use DN 21-31? The board uses lines AD11 to AD31
    > (21 lines) for selecting devices #0 - #20. 32-bit PCI bus has only 32
    > address/data lines :-)
    >
    > Perhaps they mean AD20-AD31 lines = device #9 - #0x14=20? If that is
    > the case, you can try:
    > - their "DN30" = device 0x13 = 19, which is apparently what the VIA riser
    > card does,
    > - their "DN21" = device 0xA = 10, which could work as well.
    >
    > I'm afraid both would require (different) soldering.

    So at least try the different jumper settings (without additional info,
    I hope Morex responds to my emails).
    Else do a little soldering.

    > It's possible that the riser card includes a bridge, though. A bridge
    > chip can select devices differently and thus it can handle 32 devices.

    Looking at the photo I don't think I see a bridge...

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