MPC7455 and lwarx

Gabriel Paubert paubert at
Thu Nov 28 00:00:55 EST 2002

Dave Wilhardt wrote:
> Hello,
> Is anyone using the MPC745x series and performing lwarx/stwcx. in non
> cached
> space?  The 7410 didn't seem to care but the MPC7455 take a DSI
> exception
> on non cached regions.  Is there a work-around?

No, it is documented somewhere in Motorola docs that lwarx/stwcx. only
work on writeback cacheable space. Earlier processors allow non-cacheable
space, I believe that this restriction was introduced with the 7440/7450.


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