Messages in this thread Patch in this message |  | | Date | Thu, 9 Nov 2000 17:41:02 +0300 | From | Ivan Kokshaysky <> | Subject | Re: PCI-PCI bridges mess in 2.4.x |
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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]; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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