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    SubjectRe: PCI-PCI bridges mess in 2.4.x
    On Wed, Nov 08, 2000 at 05:43:54PM -0500, Jeff Garzik wrote:
    > I am still worried that the conditions which generate the following
    > message indicate a problem still exists. (this message exists w/out
    > your patch..)
    > Unknown bridge resource 0: assuming transparent

    Well, I believe that transparent bridge must use subtractive decoding.
    Specification allows such thing, but the bridge with subtractive
    decoding enabled _must_ have programming interface code == 01h.
    If you're curious try this patch (not for applying, just for
    testing).

    Ivan.

    --- 2.4.0t11p1/drivers/pci/pci.c Fri Oct 27 02:16:46 2000
    +++ linux/drivers/pci/pci.c Thu Nov 9 17:08:16 2000
    @@ -574,6 +574,14 @@ void __init pci_read_bridge_bases(struct
    if (!dev) /* It's a host bus, nothing to read */
    return;

    + if (dev->class & 1) {
    + printk("Subtractive decoding bridge %s\nAssuming transparent\n",
    + dev->name);
    + for(i=0; i<3; i++)
    + child->resource[i] = child->parent->resource[i];
    + return;
    + }
    +
    for(i=0; i<3; i++)
    child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];

    -
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