On Friday 26 June 2015 22:35:08 Arnd Bergmann wrote: > > > > > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
