L2CR patch

[Benjamin Herrenschmidt]

Enclosed is a patch that replace the _set_L2CR function in the kernel by
a new version that is safer (does the appropriate flushing etc... when
enabling the cache).
See comments about usage. I also added an "l2cr=" kernel command-line
option that will be used by future versions of BootX to give the kernel a
correct l2cr setting for people with G3 upgrade cards. BootX application
will be able to "capture" the l2cr value set by the upgrade card software
and put it in a pref for use when booting.

The _set_L2CR was provided by Terry Greeniaus from PowerLogix, so thanks
to PowerLogix for the support !


-- 
           E-Mail: <mailto:bh40 at calva.net>
BenH.      Web   : <http://calvaweb.calvacom.fr/bh40/>

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