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* Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote: > > NOTE! This will also consider a bridge resource at 0 to be an > > invalid resource (since now the alignment will be zero), which is a > > bit odd and makes me worry a bit. I wouldn't be surprised if some > > non-PC architectures have PCI bridges at zero. But maybe they should > > be (or already are?) marked IORESOURCE_PCI_FIXED? > > PCI bridges at zero is perfectly valid indeed and I'm sure we have > that around at least for IO space. In fact, I'm surprised you don't > have that on x86. Typically, things like an HT segment with a P2P > bridge and behind that bridge an ISA bridge could well have the P2P > bridge with a resource forwarding 0...0x1000 IO downstream for example > even on x86 no ? (I'm not -that- familiar with the crazyness of legacy > ISA on x86 but I've definitely seen such setup on other archs). 0..0x1000 physical memory (== bus memory on x86) is reserved to the BIOS as RAM in essence and that legacy will be with us for at least 100 or maybe 200 years ;-) Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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