On 06/05/2013 03:08 PM, Anthony Liguori wrote:
>>
>> Definitely an option. However, we want to be able to boot from native
>> devices, too, so having an I/O BAR (which would not be used by the OS
>> driver) should still at the very least be an option.
>
> What makes it so difficult to work with an MMIO bar for PCI-e?
>
> With legacy PCI, tracking allocation of MMIO vs. PIO is pretty straight
> forward. Is there something special about PCI-e here?
>
It's not tracking allocation. It is that accessing memory above 1 MiB
is incredibly painful in the BIOS environment, which basically means
MMIO is inaccessible.
-hpa
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