Hi,
>> This seems to not support 64bit prefetchable memory windows, at least
>> linux doesn't think it does, lspci looks like this:
>>
>> 00:10.0 PCI bridge: Red Hat, Inc. Device 0001 (prog-if 00 [Normal decode])
[ ... ]
>> Memory behind bridge: f6000000-f60fffff
>> Prefetchable memory behind bridge: f8000000-fbffffff
> What in the above tells you that 64 bit windows are not supported?
lspci prints 64bit addresses then, like this:
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
Port 1 (rev 03) (prog-if 00 [Normal decode])
[ ... ]
I/O behind bridge: 00008000-00008fff
Memory behind bridge: c0000000-c01fffff
Prefetchable memory behind bridge: 00000000c0200000-00000000c03fffff
> BAR0 is 32 bit non prefetcheable. As far as I can see linux driver
> takes no precautions against access combining that can
> happen with prefetcheable BARs, so non-prefetcheable
> seems safer.
I'm not talking about bar #0, but about the prefetchable memory window
for devices behind the bridge.
cheers,
Gerd
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