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    SubjectRe: [patch 2.5] PCI: allow alternative methods for probing the BARs
    On Mon, Jan 06, 2003 at 04:13:32PM -0800, Grant Grundler wrote:
    > Turning off MASTER will also disable the controller from responding
    > to MMIO ...ie USB subsystem can't touch the USB controller until
    > it's re-enabled (no USB interrupts).

    No, MMIO is controlled by PCI_COMMAND_MEMORY bit. We'll just turn
    off DMA.

    > I still have no idea which bridge implementations (vendor/model)
    > have this problem and thus no idea what the i386 code would need
    > to look like. I was hoping Ivan (or someone) might know.

    Perhaps it will be i386-specific "PCI_FIXUP_EARLY" routine which
    turns of PCI_COMMAND_MASTER for all devices with a class code of
    PCI_CLASS_SERIAL_USB.

    Ivan.
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