[RFC PATCH 04/19] powerpc: wii: device tree

[Segher Boessenkool]

>> Yup. The idea is to map the first 16MB of MEM1 with a BAT.
>> Mapping the whole 24MB with BATs may not be possible because we  
>> want the framebuffer
>> in MEM1 for performance reasons.
>
> How big is the fb ?

A bit more than a megabyte, something like that.

> We have plenty of BATs on these things... so one 16M
> for the low mem and one 64M for the "high" mem, that leaves something
> like 6 to manage as much as possible up to the fb :-)

The CXe in the gamecube has only four BATs though.

In all code I have done for the XFB, I map it like any other RAM and
dcbst it after writing to it.  Maybe that is slower though, WIMG=0100
might be better.  Dunno.


Segher