Messages in this thread | | | Date | Thu, 4 Feb 2016 10:54:42 -0800 | From | Andi Kleen <> | Subject | Re: [PATCH] x86, pci: Add quirk for unsizeable Broadwell EP bar |
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> It sounds like these devices have some device-specific register where > BAR 0 is supposed to be? Setting IORESOURCE_PCI_FIXED doesn't seem > like the right solution to me. Even if we set that, the core still
There is no actually functional register on these locations that has any side effects.
> believes this resource corresponds to some address space consumed by > the device. I think we will still try to size the BAR and decode its > type. I think it will still show up via lspci. That's all > meaningless.
But would actually anything use it?
> How do you deal with this on Windows? > > I think you need to replace the config accessor with a special one > that knows that this register is not a BAR, and they can return zero. > Or maybe the accessor should hide these devices completely, i.e., > return 0xffffffff for the vendor/device ID. Or maybe you even have a > switch the BIOS can use to hide them from the OS.
In some cases we need the devices.
-Andi
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