Re: [patch 2.5] PCI: allow alternative methods for probing the BARs

[Ivan Kokshaysky]

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.