On Oct 22, 2008, at 9:22 AM, Matt Sealey wrote:
Kumar Gala wrote:
Your bigger issue is if you can setup the DDR controller for the
hole you want.
I just remembered;;
~~
The CCSR window always takes precedence over all local access
windows. However, the CCSR window must not overlap an LAW that maps
to the DDR controller. Otherwise, undefined behavior occurs.
~~
So, it's not really possible to map 4GB of RAM in the lower 32-bit
area, without interacting badly with the CCSR. This means you're
forced to select a 2GB LAW for DDR, then leave 2GB free, then map
the rest above.. using more than 2Gb therefore absolutely requires
non-contiguous memory..?
As I said, its all about your physical DDR layout. If you have two
DDR dimms each 2Gb you can do:
0..2G - DDR DIMM A
2G..4G - IO
4G..6G - DDR DIMM B
- k
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
