[PATCH] powerpc: add kernel parameter to set l3cr for G4 cpu

[Robert Brose]

Old-world powermacs don't set L2CR or L3CR on processor upgrade cards.
This simple patch allows the setting of L3CR via a kernel parameter
(like the existing kernel parameter to set L2CR).

This is the first time I've posted a patch, please excuse me if I've
broken protocol in any way.

Signed-off-by: Robert Brose <bob at qbjnet.com>

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