On Friday 26 June 2015 22:35:08 Arnd Bergmann wrote:

quoted

quoted

Can you configure one of the two windows as prefetchable for improved performance?

The new huge window will be prefetchable.

The DT marks it as non-prefetchable, so the kernel will now try to allocate
space for non-prefetchable BARs from this area, which is a bug. If the second
memory window is always prefetchable, you have to mark it accordingly in DT,
to prevent it from being used for normal 64 bit BARs.

Forget what I wrote here, I just remembered that 64-bit BARs are by definition
prefetchable. You should still mark the range accordingly in DT for correct
operation, but it won't be used for non-prefetchable 64-bit BARs if you don't
because they do not exist.

	Arnd