On Friday 16 January 2015 15:49:13 Will Deacon wrote:

The on-board ethernet on Seattle requires the driver to program its AXI
attributes, so configuring it to be a coherent master actually means
"program the same cacheable AXI settings as you have on the CPU". That
sounds like Linux should be doing it to me, but even if the firmware takes
a guess at "normal cacheable WBRWA", it's not clear to me whether that
register persists across things like adapter reset.

Tom?

There's also the situation where the firmware hasn't initialised the
register and Linux realises this during probe. What should it do then?

In case of a 10gbit ethernet adapter, there really should be no question
regarding whether to set it coherent or not. Can't Linux just always
set this AXI attribute in the driver?

	Arnd