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RE: MPC8260 cache patch


Yes, I also think that it's safe in this case.
>
> I vaguely recall something about some architecture or variant (not
> powerpc) which had caches where, if you "just" disabled them, it would
> still use the cache lines that were still valid. So the invalidate was
> needed too. Perhaps Nick might remember the specifics? Although I also
> vaguely recall it was one of Jesper's ports.
Here's where you are making me wonder if it might be the OMAP port.  Gee,
you would think I could remember that sort of stuff from one day to the
next.  Sigh... I'll double check that, especially since, now that you
mention it, it sounds vaguely familiar to me as well.

I guess I've got some cache problems of my own. :-)  Gary, we once discussed
ugrading to the new 2.0 brains, have you heard anything about them lately?
I've got two newer model Patricks in development right now, but they are
only 2.5 years and 5 months old, so I think it will be while before I can
depend on them for support.

>
> FWIW, re the rest of the discussion and a view from afar, dedicating 16K
> permanently out of RAM would be bad, and doing out of some
> specific region
> where it matters less would be painful to get portable. Given the
> frequency of a SYNC, I think Patrick's patch is reasonable. Perhaps
> Patrick could add an explanatory comment next to the macro as to why it's
> 2* as well.
>
What, put some documentation in the code?!?!?!? where somebody might
actually _see_ it!?!?!?! What sort of heretical organization are you trying
to run anyway? :-)

--wpd


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